Merge pull request #14104 from peppy/multiplayer-match-rulesets

Add required multiplayer models (and associated flows) for match "types"

.config/dotnet-tools.json

@@ -27,10 +27,10 @@
       ]
     },
     "ppy.localisationanalyser.tools": {
-      "version": "2021.608.0",
+      "version": "2021.725.0",
       "commands": [
         "localisation"
       ]
     }
   }
-}
+}

.editorconfig

@@ -157,7 +157,7 @@ csharp_style_unused_value_assignment_preference = discard_variable:warning
 
 #Style - variable declaration
 csharp_style_inlined_variable_declaration = true:warning
-csharp_style_deconstructed_variable_declaration = true:warning
+csharp_style_deconstructed_variable_declaration = false:silent
 
 #Style - other C# 7.x features
 dotnet_style_prefer_inferred_tuple_names = true:warning
@@ -168,8 +168,8 @@ dotnet_style_prefer_is_null_check_over_reference_equality_method = true:silent
 #Style - C# 8 features
 csharp_prefer_static_local_function = true:warning
 csharp_prefer_simple_using_statement = true:silent
-csharp_style_prefer_index_operator = true:warning
-csharp_style_prefer_range_operator = true:warning
+csharp_style_prefer_index_operator = false:silent
+csharp_style_prefer_range_operator = false:silent
 csharp_style_prefer_switch_expression = false:none
 
 #Supressing roslyn built-in analyzers
@@ -190,3 +190,5 @@ dotnet_diagnostic.CA2225.severity = none
 
 # Banned APIs
 dotnet_diagnostic.RS0030.severity = error
+
+dotnet_diagnostic.OLOC001.license_header = // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.\n// See the LICENCE file in the repository root for full licence text.

.run/Dual client test.run.xml

@@ -0,0 +1,7 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Dual client test" type="CompoundRunConfigurationType">
+    <toRun name="osu!" type="DotNetProject" />
+    <toRun name="osu! (Second Client)" type="DotNetProject" />
+    <method v="2" />
+  </configuration>
+</component>

.run/osu! (Second Client).run.xml

@@ -0,0 +1,20 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="osu! (Second Client)" type="DotNetProject" factoryName=".NET Project" folderName="osu!" activateToolWindowBeforeRun="false">
+    <option name="EXE_PATH" value="$PROJECT_DIR$/osu.Desktop/bin/Debug/net5.0/osu!.dll" />
+    <option name="PROGRAM_PARAMETERS" value="--debug-client-id=1" />
+    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/osu.Desktop/bin/Debug/net5.0" />
+    <option name="PASS_PARENT_ENVS" value="1" />
+    <option name="USE_EXTERNAL_CONSOLE" value="0" />
+    <option name="USE_MONO" value="0" />
+    <option name="RUNTIME_ARGUMENTS" value="" />
+    <option name="PROJECT_PATH" value="$PROJECT_DIR$/osu.Desktop/osu.Desktop.csproj" />
+    <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
+    <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
+    <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+    <option name="PROJECT_KIND" value="DotNetCore" />
+    <option name="PROJECT_TFM" value="net5.0" />
+    <method v="2">
+      <option name="Build" />
+    </method>
+  </configuration>
+</component>

CodeAnalysis/BannedSymbols.txt

@@ -3,6 +3,7 @@ M:System.Object.Equals(System.Object)~System.Boolean;Don't use object.Equals. Us
 M:System.ValueType.Equals(System.Object)~System.Boolean;Don't use object.Equals(Fallbacks to ValueType). Use IEquatable<T> or EqualityComparer<T>.Default instead.
 M:System.Nullable`1.Equals(System.Object)~System.Boolean;Use == instead.
 T:System.IComparable;Don't use non-generic IComparable. Use generic version instead.
+T:SixLabors.ImageSharp.IDeepCloneable`1;Use osu.Game.Utils.IDeepCloneable<T> instead.
 M:osu.Framework.Graphics.Sprites.SpriteText.#ctor;Use OsuSpriteText.
 M:osu.Framework.Bindables.IBindableList`1.GetBoundCopy();Fails on iOS. Use manual ctor + BindTo instead. (see https://github.com/mono/mono/issues/19900)
 T:Microsoft.EntityFrameworkCore.Internal.EnumerableExtensions;Don't use internal extension methods.

README.md

@@ -11,7 +11,7 @@
 
 A free-to-win rhythm game. Rhythm is just a *click* away!
 
-The future of [osu!](https://osu.ppy.sh) and the beginning of an open era! Commonly known by the codename *osu!lazer*. Pew pew.
+The future of [osu!](https://osu.ppy.sh) and the beginning of an open era! Currently known by and released under the codename "*lazer*". As in sharper than cutting-edge.
 
 ## Status
 
@@ -23,7 +23,7 @@ We are accepting bug reports (please report with as much detail as possible and
 
 - Detailed release changelogs are available on the [official osu! site](https://osu.ppy.sh/home/changelog/lazer).
 - You can learn more about our approach to [project management](https://github.com/ppy/osu/wiki/Project-management).
-- Read peppy's [latest blog post](https://blog.ppy.sh/a-definitive-lazer-faq/) exploring where lazer is currently and the roadmap going forward.
+- Read peppy's [blog post](https://blog.ppy.sh/a-definitive-lazer-faq/) exploring where the project is currently and the roadmap going forward.
 
 ## Running osu!
 

osu.Android.props

@@ -51,11 +51,11 @@
     <Reference Include="Java.Interop" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.701.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.702.0" />
+    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.803.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.803.0" />
   </ItemGroup>
   <ItemGroup Label="Transitive Dependencies">
     <!-- Realm needs to be directly referenced in all Xamarin projects, as it will not pull in its transitive dependencies otherwise. -->
-    <PackageReference Include="Realm" Version="10.2.1" />
+    <PackageReference Include="Realm" Version="10.3.0" />
   </ItemGroup>
 </Project>

osu.Android/osu.Android.csproj

@@ -64,7 +64,7 @@
     </PackageReference>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.7.0" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
 </Project>

osu.Desktop/Program.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.IO;
-using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using osu.Framework;
@@ -17,13 +16,43 @@ namespace osu.Desktop
 {
     public static class Program
     {
+        private const string base_game_name = @"osu";
+
         [STAThread]
         public static int Main(string[] args)
         {
             // Back up the cwd before DesktopGameHost changes it
             var cwd = Environment.CurrentDirectory;
 
-            using (DesktopGameHost host = Host.GetSuitableHost(@"osu", true))
+            string gameName = base_game_name;
+            bool tournamentClient = false;
+
+            foreach (var arg in args)
+            {
+                var split = arg.Split('=');
+
+                var key = split[0];
+                var val = split.Length > 1 ? split[1] : string.Empty;
+
+                switch (key)
+                {
+                    case "--tournament":
+                        tournamentClient = true;
+                        break;
+
+                    case "--debug-client-id":
+                        if (!DebugUtils.IsDebugBuild)
+                            throw new InvalidOperationException("Cannot use this argument in a non-debug build.");
+
+                        if (!int.TryParse(val, out int clientID))
+                            throw new ArgumentException("Provided client ID must be an integer.");
+
+                        gameName = $"{base_game_name}-{clientID}";
+                        break;
+                }
+            }
+
+            using (DesktopGameHost host = Host.GetSuitableHost(gameName, true))
             {
                 host.ExceptionThrown += handleException;
 
@@ -48,16 +77,10 @@ namespace osu.Desktop
                         return 0;
                 }
 
-                switch (args.FirstOrDefault() ?? string.Empty)
-                {
-                    default:
-                        host.Run(new OsuGameDesktop(args));
-                        break;
-
-                    case "--tournament":
-                        host.Run(new TournamentGame());
-                        break;
-                }
+                if (tournamentClient)
+                    host.Run(new TournamentGame());
+                else
+                    host.Run(new OsuGameDesktop(args));
 
                 return 0;
             }

osu.Desktop/Updater/SquirrelUpdateManager.cs

@@ -68,6 +68,8 @@ namespace osu.Desktop.Updater
                     return false;
                 }
 
+                scheduleRecheck = false;
+
                 if (notification == null)
                 {
                     notification = new UpdateProgressNotification(this) { State = ProgressNotificationState.Active };
@@ -98,7 +100,6 @@ namespace osu.Desktop.Updater
                         // could fail if deltas are unavailable for full update path (https://github.com/Squirrel/Squirrel.Windows/issues/959)
                         // try again without deltas.
                         await checkForUpdateAsync(false, notification).ConfigureAwait(false);
-                        scheduleRecheck = false;
                     }
                     else
                     {
@@ -110,6 +111,7 @@ namespace osu.Desktop.Updater
             catch (Exception)
             {
                 // we'll ignore this and retry later. can be triggered by no internet connection or thread abortion.
+                scheduleRecheck = true;
             }
             finally
             {

osu.Desktop/osu.Desktop.csproj

@@ -5,8 +5,8 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Description>A free-to-win rhythm game. Rhythm is just a *click* away!</Description>
     <AssemblyName>osu!</AssemblyName>
-    <Title>osu!lazer</Title>
-    <Product>osu!lazer</Product>
+    <Title>osu!</Title>
+    <Product>osu!(lazer)</Product>
     <ApplicationIcon>lazer.ico</ApplicationIcon>
     <ApplicationManifest>app.manifest</ApplicationManifest>
     <Version>0.0.0</Version>

osu.Desktop/osu.nuspec

@@ -3,7 +3,7 @@
     <metadata>
         <id>osulazer</id>
         <version>0.0.0</version>
-        <title>osu!lazer</title>
+        <title>osu!</title>
         <authors>ppy Pty Ltd</authors>
         <owners>Dean Herbert</owners>
         <projectUrl>https://osu.ppy.sh/</projectUrl>
@@ -20,4 +20,3 @@
       <file src="**.config" target="lib\net45\"/>
     </files>
 </package>
-

osu.Game.Rulesets.Catch.Tests/Editor/CatchEditorTestSceneContainer.cs

@@ -0,0 +1,66 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Timing;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Edit;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.UI;
+using osu.Game.Rulesets.UI.Scrolling;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public class CatchEditorTestSceneContainer : Container
+    {
+        [Cached(typeof(Playfield))]
+        public readonly ScrollingPlayfield Playfield;
+
+        protected override Container<Drawable> Content { get; }
+
+        public CatchEditorTestSceneContainer()
+        {
+            Anchor = Anchor.Centre;
+            Origin = Anchor.Centre;
+            Width = CatchPlayfield.WIDTH;
+            Height = 1000;
+            Padding = new MarginPadding
+            {
+                Bottom = 100
+            };
+
+            InternalChildren = new Drawable[]
+            {
+                new ScrollingTestContainer(ScrollingDirection.Down)
+                {
+                    TimeRange = 1000,
+                    RelativeSizeAxes = Axes.Both,
+                    Child = Playfield = new TestCatchPlayfield
+                    {
+                        RelativeSizeAxes = Axes.Both
+                    }
+                },
+                new PlayfieldBorder
+                {
+                    PlayfieldBorderStyle = { Value = PlayfieldBorderStyle.Full },
+                    Clock = new FramedClock(new StopwatchClock(true))
+                },
+                Content = new Container
+                {
+                    RelativeSizeAxes = Axes.Both
+                }
+            };
+        }
+
+        private class TestCatchPlayfield : CatchEditorPlayfield
+        {
+            public TestCatchPlayfield()
+                : base(new BeatmapDifficulty { CircleSize = 0 })
+            {
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/CatchPlacementBlueprintTestScene.cs

@@ -0,0 +1,79 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using NUnit.Framework;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Testing;
+using osu.Framework.Timing;
+using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
+using osu.Game.Rulesets.Catch.Objects.Drawables;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Rulesets.UI.Scrolling;
+using osu.Game.Tests.Visual;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public abstract class CatchPlacementBlueprintTestScene : PlacementBlueprintTestScene
+    {
+        protected const double TIME_SNAP = 100;
+
+        protected DrawableCatchHitObject LastObject;
+
+        protected new ScrollingHitObjectContainer HitObjectContainer => contentContainer.Playfield.HitObjectContainer;
+
+        protected override Container<Drawable> Content => contentContainer;
+
+        private readonly CatchEditorTestSceneContainer contentContainer;
+
+        protected CatchPlacementBlueprintTestScene()
+        {
+            base.Content.Add(contentContainer = new CatchEditorTestSceneContainer());
+
+            contentContainer.Playfield.Clock = new FramedClock(new ManualClock());
+        }
+
+        [SetUp]
+        public void Setup() => Schedule(() =>
+        {
+            HitObjectContainer.Clear();
+            ResetPlacement();
+            LastObject = null;
+        });
+
+        protected void AddMoveStep(double time, float x) => AddStep($"move to time={time}, x={x}", () =>
+        {
+            float y = HitObjectContainer.PositionAtTime(time);
+            Vector2 pos = HitObjectContainer.ToScreenSpace(new Vector2(x, y + HitObjectContainer.DrawHeight));
+            InputManager.MoveMouseTo(pos);
+        });
+
+        protected void AddClickStep(MouseButton button) => AddStep($"click {button}", () =>
+        {
+            InputManager.Click(button);
+        });
+
+        protected IEnumerable<FruitOutline> FruitOutlines => Content.ChildrenOfType<FruitOutline>();
+
+        // Unused because AddHitObject is overriden
+        protected override Container CreateHitObjectContainer() => new Container();
+
+        protected override void AddHitObject(DrawableHitObject hitObject)
+        {
+            LastObject = (DrawableCatchHitObject)hitObject;
+            contentContainer.Playfield.HitObjectContainer.Add(hitObject);
+        }
+
+        protected override SnapResult SnapForBlueprint(PlacementBlueprint blueprint)
+        {
+            var result = base.SnapForBlueprint(blueprint);
+            result.Time = Math.Round(HitObjectContainer.TimeAtScreenSpacePosition(result.ScreenSpacePosition) / TIME_SNAP) * TIME_SNAP;
+            return result;
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/CatchSelectionBlueprintTestScene.cs

@@ -0,0 +1,72 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Catch.Beatmaps;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.UI.Scrolling;
+using osu.Game.Screens.Edit;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public abstract class CatchSelectionBlueprintTestScene : SelectionBlueprintTestScene
+    {
+        protected ScrollingHitObjectContainer HitObjectContainer => contentContainer.Playfield.HitObjectContainer;
+
+        protected override Container<Drawable> Content => contentContainer;
+
+        [Cached(typeof(EditorBeatmap))]
+        [Cached(typeof(IBeatSnapProvider))]
+        protected readonly EditorBeatmap EditorBeatmap;
+
+        private readonly CatchEditorTestSceneContainer contentContainer;
+
+        protected CatchSelectionBlueprintTestScene()
+        {
+            EditorBeatmap = new EditorBeatmap(new CatchBeatmap());
+            EditorBeatmap.BeatmapInfo.BaseDifficulty.CircleSize = 0;
+            EditorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint
+            {
+                BeatLength = 100
+            });
+
+            base.Content.Add(new EditorBeatmapDependencyContainer(EditorBeatmap, new BindableBeatDivisor())
+            {
+                RelativeSizeAxes = Axes.Both,
+                Children = new Drawable[]
+                {
+                    EditorBeatmap,
+                    contentContainer = new CatchEditorTestSceneContainer()
+                },
+            });
+        }
+
+        protected void AddMouseMoveStep(double time, float x) => AddStep($"move to time={time}, x={x}", () =>
+        {
+            float y = HitObjectContainer.PositionAtTime(time);
+            Vector2 pos = HitObjectContainer.ToScreenSpace(new Vector2(x, y + HitObjectContainer.DrawHeight));
+            InputManager.MoveMouseTo(pos);
+        });
+
+        private class EditorBeatmapDependencyContainer : Container
+        {
+            [Cached]
+            private readonly EditorClock editorClock;
+
+            [Cached]
+            private readonly BindableBeatDivisor beatDivisor;
+
+            public EditorBeatmapDependencyContainer(IBeatmap beatmap, BindableBeatDivisor beatDivisor)
+            {
+                editorClock = new EditorClock(beatmap, beatDivisor);
+                this.beatDivisor = beatDivisor;
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/TestSceneBananaShowerPlacementBlueprint.cs

@@ -0,0 +1,87 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Testing;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Catch.Edit.Blueprints;
+using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.Objects.Drawables;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Drawables;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public class TestSceneBananaShowerPlacementBlueprint : CatchPlacementBlueprintTestScene
+    {
+        protected override DrawableHitObject CreateHitObject(HitObject hitObject) => new DrawableBananaShower((BananaShower)hitObject);
+
+        protected override PlacementBlueprint CreateBlueprint() => new BananaShowerPlacementBlueprint();
+
+        protected override void AddHitObject(DrawableHitObject hitObject)
+        {
+            // Create nested bananas (but positions are not randomized because beatmap processing is not done).
+            hitObject.HitObject.ApplyDefaults(new ControlPointInfo(), Beatmap.Value.BeatmapInfo.BaseDifficulty);
+
+            base.AddHitObject(hitObject);
+        }
+
+        [Test]
+        public void TestBasicPlacement()
+        {
+            const double start_time = 100;
+            const double end_time = 500;
+
+            AddMoveStep(start_time, 0);
+            AddClickStep(MouseButton.Left);
+            AddMoveStep(end_time, 0);
+            AddClickStep(MouseButton.Right);
+            AddAssert("banana shower is placed", () => LastObject is DrawableBananaShower);
+            AddAssert("start time is correct", () => Precision.AlmostEquals(LastObject.HitObject.StartTime, start_time));
+            AddAssert("end time is correct", () => Precision.AlmostEquals(LastObject.HitObject.GetEndTime(), end_time));
+        }
+
+        [Test]
+        public void TestReversePlacement()
+        {
+            const double start_time = 100;
+            const double end_time = 500;
+
+            AddMoveStep(end_time, 0);
+            AddClickStep(MouseButton.Left);
+            AddMoveStep(start_time, 0);
+            AddClickStep(MouseButton.Right);
+            AddAssert("start time is correct", () => Precision.AlmostEquals(LastObject.HitObject.StartTime, start_time));
+            AddAssert("end time is correct", () => Precision.AlmostEquals(LastObject.HitObject.GetEndTime(), end_time));
+        }
+
+        [Test]
+        public void TestFinishWithZeroDuration()
+        {
+            AddMoveStep(100, 0);
+            AddClickStep(MouseButton.Left);
+            AddClickStep(MouseButton.Right);
+            AddAssert("banana shower is not placed", () => LastObject == null);
+            AddAssert("state is waiting", () => CurrentBlueprint?.PlacementActive == PlacementBlueprint.PlacementState.Waiting);
+        }
+
+        [Test]
+        public void TestOpacity()
+        {
+            AddMoveStep(100, 0);
+            AddClickStep(MouseButton.Left);
+            AddUntilStep("outline is semitransparent", () => Precision.DefinitelyBigger(1, timeSpanOutline.Alpha));
+            AddMoveStep(200, 0);
+            AddUntilStep("outline is opaque", () => Precision.AlmostEquals(timeSpanOutline.Alpha, 1));
+            AddMoveStep(100, 0);
+            AddUntilStep("outline is semitransparent", () => Precision.DefinitelyBigger(1, timeSpanOutline.Alpha));
+        }
+
+        private TimeSpanOutline timeSpanOutline => Content.ChildrenOfType<TimeSpanOutline>().Single();
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/TestSceneFruitPlacementBlueprint.cs

@@ -0,0 +1,44 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Catch.Edit.Blueprints;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.Objects.Drawables;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Drawables;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public class TestSceneFruitPlacementBlueprint : CatchPlacementBlueprintTestScene
+    {
+        protected override DrawableHitObject CreateHitObject(HitObject hitObject) => new DrawableFruit((Fruit)hitObject);
+
+        protected override PlacementBlueprint CreateBlueprint() => new FruitPlacementBlueprint();
+
+        [Test]
+        public void TestFruitPlacementPosition()
+        {
+            const double time = 300;
+            const float x = CatchPlayfield.CENTER_X;
+
+            AddMoveStep(time, x);
+            AddClickStep(MouseButton.Left);
+
+            AddAssert("outline position is correct", () =>
+            {
+                var outline = FruitOutlines.Single();
+                return Precision.AlmostEquals(outline.X, x) &&
+                       Precision.AlmostEquals(outline.Y, HitObjectContainer.PositionAtTime(time));
+            });
+
+            AddAssert("fruit time is correct", () => Precision.AlmostEquals(LastObject.StartTimeBindable.Value, time));
+            AddAssert("fruit position is correct", () => Precision.AlmostEquals(LastObject.X, x));
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/TestSceneJuiceStreamPlacementBlueprint.cs

@@ -0,0 +1,155 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Extensions.ObjectExtensions;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Catch.Edit.Blueprints;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.Objects.Drawables;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Drawables;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public class TestSceneJuiceStreamPlacementBlueprint : CatchPlacementBlueprintTestScene
+    {
+        private const double velocity = 0.5;
+
+        private JuiceStream lastObject => LastObject?.HitObject as JuiceStream;
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Beatmap.Value.BeatmapInfo.BaseDifficulty.SliderTickRate = 5;
+            Beatmap.Value.BeatmapInfo.BaseDifficulty.SliderMultiplier = velocity * 10;
+        }
+
+        [Test]
+        public void TestBasicPlacement()
+        {
+            double[] times = { 300, 800 };
+            float[] positions = { 100, 200 };
+            addPlacementSteps(times, positions);
+
+            AddAssert("juice stream is placed", () => lastObject != null);
+            AddAssert("start time is correct", () => Precision.AlmostEquals(lastObject.StartTime, times[0]));
+            AddAssert("end time is correct", () => Precision.AlmostEquals(lastObject.EndTime, times[1]));
+            AddAssert("start position is correct", () => Precision.AlmostEquals(lastObject.OriginalX, positions[0]));
+            AddAssert("end position is correct", () => Precision.AlmostEquals(lastObject.EndX, positions[1]));
+        }
+
+        [Test]
+        public void TestEmptyNotCommitted()
+        {
+            addMoveAndClickSteps(100, 100);
+            addMoveAndClickSteps(100, 100);
+            addMoveAndClickSteps(100, 100, true);
+            AddAssert("juice stream not placed", () => lastObject == null);
+        }
+
+        [Test]
+        public void TestMultipleSegments()
+        {
+            double[] times = { 100, 300, 500, 700 };
+            float[] positions = { 100, 150, 100, 100 };
+            addPlacementSteps(times, positions);
+
+            AddAssert("has 4 vertices", () => lastObject.Path.ControlPoints.Count == 4);
+            addPathCheckStep(times, positions);
+        }
+
+        [Test]
+        public void TestVelocityLimit()
+        {
+            double[] times = { 100, 300 };
+            float[] positions = { 200, 500 };
+            addPlacementSteps(times, positions);
+            addPathCheckStep(times, new float[] { 200, 300 });
+        }
+
+        [Test]
+        public void TestPreviousVerticesAreFixed()
+        {
+            double[] times = { 100, 300, 500, 700 };
+            float[] positions = { 200, 400, 100, 500 };
+            addPlacementSteps(times, positions);
+            addPathCheckStep(times, new float[] { 200, 300, 200, 300 });
+        }
+
+        [Test]
+        public void TestClampedPositionIsRestored()
+        {
+            double[] times = { 100, 300, 500 };
+            float[] positions = { 200, 200, 0, 250 };
+
+            addMoveAndClickSteps(times[0], positions[0]);
+            addMoveAndClickSteps(times[1], positions[1]);
+            AddMoveStep(times[2], positions[2]);
+            addMoveAndClickSteps(times[2], positions[3], true);
+
+            addPathCheckStep(times, new float[] { 200, 200, 250 });
+        }
+
+        [Test]
+        public void TestFirstVertexIsFixed()
+        {
+            double[] times = { 100, 200 };
+            float[] positions = { 100, 300 };
+            addPlacementSteps(times, positions);
+            addPathCheckStep(times, new float[] { 100, 150 });
+        }
+
+        [Test]
+        public void TestOutOfOrder()
+        {
+            double[] times = { 100, 700, 500, 300 };
+            float[] positions = { 100, 200, 150, 50 };
+            addPlacementSteps(times, positions);
+            addPathCheckStep(times, positions);
+        }
+
+        [Test]
+        public void TestMoveBeforeFirstVertex()
+        {
+            double[] times = { 300, 500, 100 };
+            float[] positions = { 100, 100, 100 };
+            addPlacementSteps(times, positions);
+            AddAssert("start time is correct", () => Precision.AlmostEquals(lastObject.StartTime, times[0]));
+            AddAssert("end time is correct", () => Precision.AlmostEquals(lastObject.EndTime, times[1], 1e-3));
+        }
+
+        protected override DrawableHitObject CreateHitObject(HitObject hitObject) => new DrawableJuiceStream((JuiceStream)hitObject);
+
+        protected override PlacementBlueprint CreateBlueprint() => new JuiceStreamPlacementBlueprint();
+
+        private void addMoveAndClickSteps(double time, float position, bool end = false)
+        {
+            AddMoveStep(time, position);
+            AddClickStep(end ? MouseButton.Right : MouseButton.Left);
+        }
+
+        private void addPlacementSteps(double[] times, float[] positions)
+        {
+            for (int i = 0; i < times.Length; i++)
+                addMoveAndClickSteps(times[i], positions[i], i == times.Length - 1);
+        }
+
+        private void addPathCheckStep(double[] times, float[] positions) => AddStep("assert path is correct", () =>
+            Assert.That(getPositions(times), Is.EqualTo(positions).Within(Precision.FLOAT_EPSILON)));
+
+        private float[] getPositions(IEnumerable<double> times)
+        {
+            JuiceStream hitObject = lastObject.AsNonNull();
+            return times
+                   .Select(time => (time - hitObject.StartTime) * hitObject.Velocity)
+                   .Select(distance => hitObject.EffectiveX + hitObject.Path.PositionAt(distance / hitObject.Distance).X)
+                   .ToArray();
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Editor/TestSceneJuiceStreamSelectionBlueprint.cs

@@ -0,0 +1,286 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Testing;
+using osu.Framework.Timing;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Catch.Edit.Blueprints;
+using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public class TestSceneJuiceStreamSelectionBlueprint : CatchSelectionBlueprintTestScene
+    {
+        private JuiceStream hitObject;
+
+        private readonly ManualClock manualClock = new ManualClock();
+
+        [SetUp]
+        public void SetUp() => Schedule(() =>
+        {
+            EditorBeatmap.Clear();
+            Content.Clear();
+
+            manualClock.CurrentTime = 0;
+            Content.Clock = new FramedClock(manualClock);
+
+            InputManager.ReleaseButton(MouseButton.Left);
+            InputManager.ReleaseKey(Key.ShiftLeft);
+            InputManager.ReleaseKey(Key.ControlLeft);
+        });
+
+        [Test]
+        public void TestBasicComponentLayout()
+        {
+            double[] times = { 100, 300, 500 };
+            float[] positions = { 100, 200, 100 };
+            addBlueprintStep(times, positions);
+
+            for (int i = 0; i < times.Length; i++)
+                addVertexCheckStep(times.Length, i, times[i], positions[i]);
+
+            AddAssert("correct outline count", () =>
+            {
+                var expected = hitObject.NestedHitObjects.Count(h => !(h is TinyDroplet));
+                return this.ChildrenOfType<FruitOutline>().Count() == expected;
+            });
+            AddAssert("correct vertex piece count", () =>
+                this.ChildrenOfType<VertexPiece>().Count() == times.Length);
+
+            AddAssert("first vertex is semitransparent", () =>
+                Precision.DefinitelyBigger(1, this.ChildrenOfType<VertexPiece>().First().Alpha));
+        }
+
+        [Test]
+        public void TestVertexDrag()
+        {
+            double[] times = { 100, 400, 700 };
+            float[] positions = { 100, 100, 100 };
+            addBlueprintStep(times, positions);
+
+            addDragStartStep(times[1], positions[1]);
+
+            AddMouseMoveStep(500, 150);
+            addVertexCheckStep(3, 1, 500, 150);
+
+            addDragEndStep();
+            addDragStartStep(times[2], positions[2]);
+
+            AddMouseMoveStep(300, 50);
+            addVertexCheckStep(3, 1, 300, 50);
+            addVertexCheckStep(3, 2, 500, 150);
+
+            AddMouseMoveStep(-100, 100);
+            addVertexCheckStep(3, 1, times[0], positions[0]);
+        }
+
+        [Test]
+        public void TestMultipleDrag()
+        {
+            double[] times = { 100, 300, 500, 700 };
+            float[] positions = { 100, 100, 100, 100 };
+            addBlueprintStep(times, positions);
+
+            AddMouseMoveStep(times[1], positions[1]);
+            AddStep("press left", () => InputManager.PressButton(MouseButton.Left));
+            AddStep("release left", () => InputManager.ReleaseButton(MouseButton.Left));
+            AddStep("hold control", () => InputManager.PressKey(Key.ControlLeft));
+            addDragStartStep(times[2], positions[2]);
+
+            AddMouseMoveStep(times[2] - 50, positions[2] - 50);
+            addVertexCheckStep(4, 1, times[1] - 50, positions[1] - 50);
+            addVertexCheckStep(4, 2, times[2] - 50, positions[2] - 50);
+        }
+
+        [Test]
+        public void TestClampedPositionIsRestored()
+        {
+            const double velocity = 0.25;
+            double[] times = { 100, 500, 700 };
+            float[] positions = { 100, 100, 100 };
+            addBlueprintStep(times, positions, velocity);
+
+            addDragStartStep(times[1], positions[1]);
+
+            AddMouseMoveStep(times[1], 200);
+            addVertexCheckStep(3, 1, times[1], 200);
+            addVertexCheckStep(3, 2, times[2], 150);
+
+            AddMouseMoveStep(times[1], 100);
+            addVertexCheckStep(3, 1, times[1], 100);
+            // Stored position is restored.
+            addVertexCheckStep(3, 2, times[2], positions[2]);
+
+            AddMouseMoveStep(times[1], 300);
+            addDragEndStep();
+            addDragStartStep(times[1], 300);
+
+            AddMouseMoveStep(times[1], 100);
+            // Position is different because a changed position is committed when the previous drag is ended.
+            addVertexCheckStep(3, 2, times[2], 250);
+        }
+
+        [Test]
+        public void TestScrollWhileDrag()
+        {
+            double[] times = { 300, 500 };
+            float[] positions = { 100, 100 };
+            addBlueprintStep(times, positions);
+
+            addDragStartStep(times[1], positions[1]);
+            // This mouse move is necessary to start drag and capture the input.
+            AddMouseMoveStep(times[1], positions[1] + 50);
+
+            AddStep("scroll playfield", () => manualClock.CurrentTime += 200);
+            AddMouseMoveStep(times[1] + 200, positions[1] + 100);
+            addVertexCheckStep(2, 1, times[1] + 200, positions[1] + 100);
+        }
+
+        [Test]
+        public void TestUpdateFromHitObject()
+        {
+            double[] times = { 100, 300 };
+            float[] positions = { 200, 200 };
+            addBlueprintStep(times, positions);
+
+            AddStep("update hit object path", () =>
+            {
+                hitObject.Path = new SliderPath(PathType.PerfectCurve, new[]
+                {
+                    Vector2.Zero,
+                    new Vector2(100, 100),
+                    new Vector2(0, 200),
+                });
+                EditorBeatmap.Update(hitObject);
+            });
+            AddAssert("path is updated", () => getVertices().Count > 2);
+        }
+
+        [Test]
+        public void TestAddVertex()
+        {
+            double[] times = { 100, 700 };
+            float[] positions = { 200, 200 };
+            addBlueprintStep(times, positions, 0.2);
+
+            addAddVertexSteps(500, 150);
+            addVertexCheckStep(3, 1, 500, 150);
+
+            addAddVertexSteps(90, 220);
+            addVertexCheckStep(4, 1, times[0], positions[0]);
+
+            addAddVertexSteps(750, 180);
+            addVertexCheckStep(5, 4, 750, 180);
+            AddAssert("duration is changed", () => Precision.AlmostEquals(hitObject.Duration, 800 - times[0], 1e-3));
+        }
+
+        [Test]
+        public void TestDeleteVertex()
+        {
+            double[] times = { 100, 300, 500 };
+            float[] positions = { 100, 200, 150 };
+            addBlueprintStep(times, positions);
+
+            addDeleteVertexSteps(times[1], positions[1]);
+            addVertexCheckStep(2, 1, times[2], positions[2]);
+
+            // The first vertex cannot be deleted.
+            addDeleteVertexSteps(times[0], positions[0]);
+            addVertexCheckStep(2, 0, times[0], positions[0]);
+
+            addDeleteVertexSteps(times[2], positions[2]);
+            addVertexCheckStep(1, 0, times[0], positions[0]);
+        }
+
+        [Test]
+        public void TestVertexResampling()
+        {
+            addBlueprintStep(100, 100, new SliderPath(PathType.PerfectCurve, new[]
+            {
+                Vector2.Zero,
+                new Vector2(100, 100),
+                new Vector2(50, 200),
+            }), 0.5);
+            AddAssert("1 vertex per 1 nested HO", () => getVertices().Count == hitObject.NestedHitObjects.Count);
+            AddAssert("slider path not yet changed", () => hitObject.Path.ControlPoints[0].Type.Value == PathType.PerfectCurve);
+            addAddVertexSteps(150, 150);
+            AddAssert("slider path change to linear", () => hitObject.Path.ControlPoints[0].Type.Value == PathType.Linear);
+        }
+
+        private void addBlueprintStep(double time, float x, SliderPath sliderPath, double velocity) => AddStep("add selection blueprint", () =>
+        {
+            hitObject = new JuiceStream
+            {
+                StartTime = time,
+                X = x,
+                Path = sliderPath,
+            };
+            EditorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = velocity;
+            EditorBeatmap.Add(hitObject);
+            EditorBeatmap.Update(hitObject);
+            Assert.That(hitObject.Velocity, Is.EqualTo(velocity));
+            AddBlueprint(new JuiceStreamSelectionBlueprint(hitObject));
+        });
+
+        private void addBlueprintStep(double[] times, float[] positions, double velocity = 0.5)
+        {
+            var path = new JuiceStreamPath();
+            for (int i = 1; i < times.Length; i++)
+                path.Add((times[i] - times[0]) * velocity, positions[i] - positions[0]);
+
+            var sliderPath = new SliderPath();
+            path.ConvertToSliderPath(sliderPath, 0);
+            addBlueprintStep(times[0], positions[0], sliderPath, velocity);
+        }
+
+        private IReadOnlyList<JuiceStreamPathVertex> getVertices() => this.ChildrenOfType<EditablePath>().Single().Vertices;
+
+        private void addVertexCheckStep(int count, int index, double time, float x) => AddAssert($"vertex {index} of {count} at {time}, {x}", () =>
+        {
+            double expectedDistance = (time - hitObject.StartTime) * hitObject.Velocity;
+            float expectedX = x - hitObject.OriginalX;
+            var vertices = getVertices();
+            return vertices.Count == count &&
+                   Precision.AlmostEquals(vertices[index].Distance, expectedDistance, 1e-3) &&
+                   Precision.AlmostEquals(vertices[index].X, expectedX);
+        });
+
+        private void addDragStartStep(double time, float x)
+        {
+            AddMouseMoveStep(time, x);
+            AddStep("start dragging", () => InputManager.PressButton(MouseButton.Left));
+        }
+
+        private void addDragEndStep() => AddStep("end dragging", () => InputManager.ReleaseButton(MouseButton.Left));
+
+        private void addAddVertexSteps(double time, float x)
+        {
+            AddMouseMoveStep(time, x);
+            AddStep("add vertex", () =>
+            {
+                InputManager.PressKey(Key.ControlLeft);
+                InputManager.Click(MouseButton.Left);
+                InputManager.ReleaseKey(Key.ControlLeft);
+            });
+        }
+
+        private void addDeleteVertexSteps(double time, float x)
+        {
+            AddMouseMoveStep(time, x);
+            AddStep("delete vertex", () =>
+            {
+                InputManager.PressKey(Key.ShiftLeft);
+                InputManager.Click(MouseButton.Left);
+                InputManager.ReleaseKey(Key.ShiftLeft);
+            });
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/JuiceStreamPathTest.cs

@@ -0,0 +1,288 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Tests
+{
+    [TestFixture]
+    public class JuiceStreamPathTest
+    {
+        [TestCase(1e3, true, false)]
+        // When the coordinates are large, the slope invariant fails within the specified absolute allowance due to the floating-number precision.
+        [TestCase(1e9, false, false)]
+        // Using discrete values sometimes discover more edge cases.
+        [TestCase(10, true, true)]
+        public void TestRandomInsertSetPosition(double scale, bool checkSlope, bool integralValues)
+        {
+            var rng = new Random(1);
+            var path = new JuiceStreamPath();
+
+            for (int iteration = 0; iteration < 100000; iteration++)
+            {
+                if (rng.Next(10) == 0)
+                    path.Clear();
+
+                int vertexCount = path.Vertices.Count;
+
+                switch (rng.Next(2))
+                {
+                    case 0:
+                    {
+                        double distance = rng.NextDouble() * scale * 2 - scale;
+                        if (integralValues)
+                            distance = Math.Round(distance);
+
+                        float oldX = path.PositionAtDistance(distance);
+                        int index = path.InsertVertex(distance);
+                        Assert.That(path.Vertices.Count, Is.EqualTo(vertexCount + 1));
+                        Assert.That(path.Vertices[index].Distance, Is.EqualTo(distance));
+                        Assert.That(path.Vertices[index].X, Is.EqualTo(oldX));
+                        break;
+                    }
+
+                    case 1:
+                    {
+                        int index = rng.Next(path.Vertices.Count);
+                        double distance = path.Vertices[index].Distance;
+                        float newX = (float)(rng.NextDouble() * scale * 2 - scale);
+                        if (integralValues)
+                            newX = MathF.Round(newX);
+
+                        path.SetVertexPosition(index, newX);
+                        Assert.That(path.Vertices.Count, Is.EqualTo(vertexCount));
+                        Assert.That(path.Vertices[index].Distance, Is.EqualTo(distance));
+                        Assert.That(path.Vertices[index].X, Is.EqualTo(newX));
+                        break;
+                    }
+                }
+
+                assertInvariants(path.Vertices, checkSlope);
+            }
+        }
+
+        [Test]
+        public void TestRemoveVertices()
+        {
+            var path = new JuiceStreamPath();
+            path.Add(10, 5);
+            path.Add(20, -5);
+
+            int removeCount = path.RemoveVertices((v, i) => v.Distance == 10 && i == 1);
+            Assert.That(removeCount, Is.EqualTo(1));
+            Assert.That(path.Vertices, Is.EqualTo(new[]
+            {
+                new JuiceStreamPathVertex(0, 0),
+                new JuiceStreamPathVertex(20, -5)
+            }));
+
+            removeCount = path.RemoveVertices((_, i) => i == 0);
+            Assert.That(removeCount, Is.EqualTo(1));
+            Assert.That(path.Vertices, Is.EqualTo(new[]
+            {
+                new JuiceStreamPathVertex(20, -5)
+            }));
+
+            removeCount = path.RemoveVertices((_, i) => true);
+            Assert.That(removeCount, Is.EqualTo(1));
+            Assert.That(path.Vertices, Is.EqualTo(new[]
+            {
+                new JuiceStreamPathVertex()
+            }));
+        }
+
+        [Test]
+        public void TestResampleVertices()
+        {
+            var path = new JuiceStreamPath();
+            path.Add(-100, -10);
+            path.Add(100, 50);
+            path.ResampleVertices(new double[]
+            {
+                -50,
+                0,
+                70,
+                120
+            });
+            Assert.That(path.Vertices, Is.EqualTo(new[]
+            {
+                new JuiceStreamPathVertex(-100, -10),
+                new JuiceStreamPathVertex(-50, -5),
+                new JuiceStreamPathVertex(0, 0),
+                new JuiceStreamPathVertex(70, 35),
+                new JuiceStreamPathVertex(100, 50),
+                new JuiceStreamPathVertex(100, 50),
+            }));
+
+            path.Clear();
+            path.SetVertexPosition(0, 10);
+            path.ResampleVertices(Array.Empty<double>());
+            Assert.That(path.Vertices, Is.EqualTo(new[]
+            {
+                new JuiceStreamPathVertex(0, 10)
+            }));
+        }
+
+        [Test]
+        public void TestRandomConvertFromSliderPath()
+        {
+            var rng = new Random(1);
+            var path = new JuiceStreamPath();
+            var sliderPath = new SliderPath();
+
+            for (int iteration = 0; iteration < 10000; iteration++)
+            {
+                sliderPath.ControlPoints.Clear();
+
+                do
+                {
+                    int start = sliderPath.ControlPoints.Count;
+
+                    do
+                    {
+                        float x = (float)(rng.NextDouble() * 1e3);
+                        float y = (float)(rng.NextDouble() * 1e3);
+                        sliderPath.ControlPoints.Add(new PathControlPoint(new Vector2(x, y)));
+                    } while (rng.Next(2) != 0);
+
+                    int length = sliderPath.ControlPoints.Count - start + 1;
+                    sliderPath.ControlPoints[start].Type.Value = length <= 2 ? PathType.Linear : length == 3 ? PathType.PerfectCurve : PathType.Bezier;
+                } while (rng.Next(3) != 0);
+
+                if (rng.Next(5) == 0)
+                    sliderPath.ExpectedDistance.Value = rng.NextDouble() * 3e3;
+                else
+                    sliderPath.ExpectedDistance.Value = null;
+
+                path.ConvertFromSliderPath(sliderPath);
+                Assert.That(path.Vertices[0].Distance, Is.EqualTo(0));
+                Assert.That(path.Distance, Is.EqualTo(sliderPath.Distance).Within(1e-3));
+                assertInvariants(path.Vertices, true);
+
+                double[] sampleDistances = Enumerable.Range(0, 10)
+                                                     .Select(_ => rng.NextDouble() * sliderPath.Distance)
+                                                     .ToArray();
+
+                foreach (double distance in sampleDistances)
+                {
+                    float expected = sliderPath.PositionAt(distance / sliderPath.Distance).X;
+                    Assert.That(path.PositionAtDistance(distance), Is.EqualTo(expected).Within(1e-3));
+                }
+
+                path.ResampleVertices(sampleDistances);
+                assertInvariants(path.Vertices, true);
+
+                foreach (double distance in sampleDistances)
+                {
+                    float expected = sliderPath.PositionAt(distance / sliderPath.Distance).X;
+                    Assert.That(path.PositionAtDistance(distance), Is.EqualTo(expected).Within(1e-3));
+                }
+            }
+        }
+
+        [Test]
+        public void TestRandomConvertToSliderPath()
+        {
+            var rng = new Random(1);
+            var path = new JuiceStreamPath();
+            var sliderPath = new SliderPath();
+
+            for (int iteration = 0; iteration < 10000; iteration++)
+            {
+                path.Clear();
+
+                do
+                {
+                    double distance = rng.NextDouble() * 1e3;
+                    float x = (float)(rng.NextDouble() * 1e3);
+                    path.Add(distance, x);
+                } while (rng.Next(5) != 0);
+
+                float sliderStartY = (float)(rng.NextDouble() * JuiceStreamPath.OSU_PLAYFIELD_HEIGHT);
+
+                path.ConvertToSliderPath(sliderPath, sliderStartY);
+                Assert.That(sliderPath.Distance, Is.EqualTo(path.Distance).Within(1e-3));
+                Assert.That(sliderPath.ControlPoints[0].Position.Value.X, Is.EqualTo(path.Vertices[0].X));
+                assertInvariants(path.Vertices, true);
+
+                foreach (var point in sliderPath.ControlPoints)
+                {
+                    Assert.That(point.Type.Value, Is.EqualTo(PathType.Linear).Or.Null);
+                    Assert.That(sliderStartY + point.Position.Value.Y, Is.InRange(0, JuiceStreamPath.OSU_PLAYFIELD_HEIGHT));
+                }
+
+                for (int i = 0; i < 10; i++)
+                {
+                    double distance = rng.NextDouble() * path.Distance;
+                    float expected = path.PositionAtDistance(distance);
+                    Assert.That(sliderPath.PositionAt(distance / sliderPath.Distance).X, Is.EqualTo(expected).Within(1e-3));
+                }
+            }
+        }
+
+        [Test]
+        public void TestInvalidation()
+        {
+            var path = new JuiceStreamPath();
+            Assert.That(path.InvalidationID, Is.EqualTo(1));
+            int previousId = path.InvalidationID;
+
+            path.InsertVertex(10);
+            checkNewId();
+
+            path.SetVertexPosition(1, 5);
+            checkNewId();
+
+            path.Add(20, 0);
+            checkNewId();
+
+            path.RemoveVertices((v, _) => v.Distance == 20);
+            checkNewId();
+
+            path.ResampleVertices(new double[] { 5, 10, 15 });
+            checkNewId();
+
+            path.Clear();
+            checkNewId();
+
+            path.ConvertFromSliderPath(new SliderPath());
+            checkNewId();
+
+            void checkNewId()
+            {
+                Assert.That(path.InvalidationID, Is.Not.EqualTo(previousId));
+                previousId = path.InvalidationID;
+            }
+        }
+
+        private void assertInvariants(IReadOnlyList<JuiceStreamPathVertex> vertices, bool checkSlope)
+        {
+            Assert.That(vertices, Is.Not.Empty);
+
+            for (int i = 0; i < vertices.Count; i++)
+            {
+                Assert.That(double.IsFinite(vertices[i].Distance));
+                Assert.That(float.IsFinite(vertices[i].X));
+            }
+
+            for (int i = 1; i < vertices.Count; i++)
+            {
+                Assert.That(vertices[i].Distance, Is.GreaterThanOrEqualTo(vertices[i - 1].Distance));
+
+                if (!checkSlope) continue;
+
+                float xDiff = Math.Abs(vertices[i].X - vertices[i - 1].X);
+                double distanceDiff = vertices[i].Distance - vertices[i - 1].Distance;
+                Assert.That(xDiff, Is.LessThanOrEqualTo(distanceDiff).Within(Precision.FLOAT_EPSILON));
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/TestSceneCatchSkinConfiguration.cs

@@ -0,0 +1,109 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Testing;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Catch.Judgements;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.Objects.Drawables;
+using osu.Game.Rulesets.Catch.Skinning;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Skinning;
+using osu.Game.Tests.Visual;
+using Direction = osu.Game.Rulesets.Catch.UI.Direction;
+
+namespace osu.Game.Rulesets.Catch.Tests
+{
+    public class TestSceneCatchSkinConfiguration : OsuTestScene
+    {
+        private Catcher catcher;
+
+        private readonly Container container;
+
+        public TestSceneCatchSkinConfiguration()
+        {
+            Add(container = new Container { RelativeSizeAxes = Axes.Both });
+        }
+
+        [TestCase(false)]
+        [TestCase(true)]
+        public void TestCatcherPlateFlipping(bool flip)
+        {
+            AddStep("setup catcher", () =>
+            {
+                var skin = new TestSkin { FlipCatcherPlate = flip };
+                container.Child = new SkinProvidingContainer(skin)
+                {
+                    Child = catcher = new Catcher(new DroppedObjectContainer())
+                    {
+                        Anchor = Anchor.Centre
+                    }
+                };
+            });
+
+            Fruit fruit = new Fruit();
+
+            AddStep("catch fruit", () => catchFruit(fruit, 20));
+
+            float position = 0;
+
+            AddStep("record fruit position", () => position = getCaughtObjectPosition(fruit));
+
+            AddStep("face left", () => catcher.VisualDirection = Direction.Left);
+
+            if (flip)
+                AddAssert("fruit position changed", () => !Precision.AlmostEquals(getCaughtObjectPosition(fruit), position));
+            else
+                AddAssert("fruit position unchanged", () => Precision.AlmostEquals(getCaughtObjectPosition(fruit), position));
+
+            AddStep("face right", () => catcher.VisualDirection = Direction.Right);
+
+            AddAssert("fruit position restored", () => Precision.AlmostEquals(getCaughtObjectPosition(fruit), position));
+        }
+
+        private float getCaughtObjectPosition(Fruit fruit)
+        {
+            var caughtObject = catcher.ChildrenOfType<CaughtObject>().Single(c => c.HitObject == fruit);
+            return caughtObject.Parent.ToSpaceOfOtherDrawable(caughtObject.Position, catcher).X;
+        }
+
+        private void catchFruit(Fruit fruit, float x)
+        {
+            fruit.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+            var drawableFruit = new DrawableFruit(fruit) { X = x };
+            var judgement = fruit.CreateJudgement();
+            catcher.OnNewResult(drawableFruit, new CatchJudgementResult(fruit, judgement)
+            {
+                Type = judgement.MaxResult
+            });
+        }
+
+        private class TestSkin : DefaultSkin
+        {
+            public bool FlipCatcherPlate { get; set; }
+
+            public TestSkin()
+                : base(null)
+            {
+            }
+
+            public override IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup)
+            {
+                if (lookup is CatchSkinConfiguration config)
+                {
+                    if (config == CatchSkinConfiguration.FlipCatcherPlate)
+                        return SkinUtils.As<TValue>(new Bindable<bool>(FlipCatcherPlate));
+                }
+
+                return base.GetConfig<TLookup, TValue>(lookup);
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/TestSceneCatcher.cs

@@ -31,23 +31,10 @@ namespace osu.Game.Rulesets.Catch.Tests
         [Resolved]
         private OsuConfigManager config { get; set; }
 
-        [Cached]
-        private readonly DroppedObjectContainer droppedObjectContainer;
-
-        private readonly Container trailContainer;
+        private DroppedObjectContainer droppedObjectContainer;
 
         private TestCatcher catcher;
 
-        public TestSceneCatcher()
-        {
-            Add(trailContainer = new Container
-            {
-                Anchor = Anchor.Centre,
-                Depth = -1
-            });
-            Add(droppedObjectContainer = new DroppedObjectContainer());
-        }
-
         [SetUp]
         public void SetUp() => Schedule(() =>
         {
@@ -56,13 +43,17 @@ namespace osu.Game.Rulesets.Catch.Tests
                 CircleSize = 0,
             };
 
-            if (catcher != null)
-                Remove(catcher);
+            droppedObjectContainer = new DroppedObjectContainer();
 
-            Add(catcher = new TestCatcher(trailContainer, difficulty)
+            Child = new Container
             {
-                Anchor = Anchor.Centre
-            });
+                Anchor = Anchor.Centre,
+                Children = new Drawable[]
+                {
+                    droppedObjectContainer,
+                    catcher = new TestCatcher(droppedObjectContainer, difficulty),
+                }
+            };
         });
 
         [Test]
@@ -194,9 +185,9 @@ namespace osu.Game.Rulesets.Catch.Tests
             AddStep("catch more fruits", () => attemptCatch(() => new Fruit(), 9));
             checkPlate(10);
             AddAssert("caught objects are stacked", () =>
-                catcher.CaughtObjects.All(obj => obj.Y <= Catcher.CAUGHT_FRUIT_VERTICAL_OFFSET) &&
-                catcher.CaughtObjects.Any(obj => obj.Y == Catcher.CAUGHT_FRUIT_VERTICAL_OFFSET) &&
-                catcher.CaughtObjects.Any(obj => obj.Y < -25));
+                catcher.CaughtObjects.All(obj => obj.Y <= 0) &&
+                catcher.CaughtObjects.Any(obj => obj.Y == 0) &&
+                catcher.CaughtObjects.Any(obj => obj.Y < 0));
         }
 
         [Test]
@@ -299,8 +290,8 @@ namespace osu.Game.Rulesets.Catch.Tests
         {
             public IEnumerable<CaughtObject> CaughtObjects => this.ChildrenOfType<CaughtObject>();
 
-            public TestCatcher(Container trailsTarget, BeatmapDifficulty difficulty)
-                : base(trailsTarget, difficulty)
+            public TestCatcher(DroppedObjectContainer droppedObjectTarget, BeatmapDifficulty difficulty)
+                : base(droppedObjectTarget, difficulty)
             {
             }
         }

osu.Game.Rulesets.Catch.Tests/TestSceneCatcherArea.cs

@@ -77,7 +77,7 @@ namespace osu.Game.Rulesets.Catch.Tests
                 {
                     area.OnNewResult(drawable, new CatchJudgementResult(fruit, new CatchJudgement())
                     {
-                        Type = area.MovableCatcher.CanCatch(fruit) ? HitResult.Great : HitResult.Miss
+                        Type = area.Catcher.CanCatch(fruit) ? HitResult.Great : HitResult.Miss
                     });
 
                     drawable.Expire();
@@ -119,16 +119,18 @@ namespace osu.Game.Rulesets.Catch.Tests
 
         private class TestCatcherArea : CatcherArea
         {
-            [Cached]
-            private readonly DroppedObjectContainer droppedObjectContainer;
-
             public TestCatcherArea(BeatmapDifficulty beatmapDifficulty)
-                : base(beatmapDifficulty)
             {
-                AddInternal(droppedObjectContainer = new DroppedObjectContainer());
+                var droppedObjectContainer = new DroppedObjectContainer();
+                Add(droppedObjectContainer);
+
+                Catcher = new Catcher(droppedObjectContainer, beatmapDifficulty)
+                {
+                    X = CatchPlayfield.CENTER_X
+                };
             }
 
-            public void ToggleHyperDash(bool status) => MovableCatcher.SetHyperDashState(status ? 2 : 1);
+            public void ToggleHyperDash(bool status) => Catcher.SetHyperDashState(status ? 2 : 1);
         }
     }
 }

osu.Game.Rulesets.Catch.Tests/TestSceneDrawableHitObjects.cs

@@ -97,7 +97,7 @@ namespace osu.Game.Rulesets.Catch.Tests
 
         private bool playfieldIsEmpty => !((CatchPlayfield)drawableRuleset.Playfield).AllHitObjects.Any(h => h.IsAlive);
 
-        private CatcherAnimationState catcherState => ((CatchPlayfield)drawableRuleset.Playfield).CatcherArea.MovableCatcher.CurrentState;
+        private CatcherAnimationState catcherState => ((CatchPlayfield)drawableRuleset.Playfield).Catcher.CurrentState;
 
         private void spawnFruits(bool hit = false)
         {
@@ -162,7 +162,7 @@ namespace osu.Game.Rulesets.Catch.Tests
             float xCoords = CatchPlayfield.CENTER_X;
 
             if (drawableRuleset.Playfield is CatchPlayfield catchPlayfield)
-                catchPlayfield.CatcherArea.MovableCatcher.X = xCoords - x_offset;
+                catchPlayfield.Catcher.X = xCoords - x_offset;
 
             if (hit)
                 xCoords -= x_offset;

osu.Game.Rulesets.Catch.Tests/TestSceneHyperDash.cs

@@ -33,7 +33,7 @@ namespace osu.Game.Rulesets.Catch.Tests
                 // this needs to be done within the frame stable context due to how quickly hyperdash state changes occur.
                 Player.DrawableRuleset.FrameStableComponents.OnUpdate += d =>
                 {
-                    var catcher = Player.ChildrenOfType<CatcherArea>().FirstOrDefault()?.MovableCatcher;
+                    var catcher = Player.ChildrenOfType<Catcher>().FirstOrDefault();
 
                     if (catcher == null)
                         return;

osu.Game.Rulesets.Catch.Tests/TestSceneHyperDashColouring.cs

@@ -47,7 +47,7 @@ namespace osu.Game.Rulesets.Catch.Tests
         }
 
         [Test]
-        public void TestCustomEndGlowColour()
+        public void TestCustomAfterImageColour()
         {
             var skin = new TestSkin
             {
@@ -58,7 +58,7 @@ namespace osu.Game.Rulesets.Catch.Tests
         }
 
         [Test]
-        public void TestCustomEndGlowColourPriority()
+        public void TestCustomAfterImageColourPriority()
         {
             var skin = new TestSkin
             {
@@ -111,38 +111,45 @@ namespace osu.Game.Rulesets.Catch.Tests
             checkHyperDashFruitColour(skin, skin.HyperDashColour);
         }
 
-        private void checkHyperDashCatcherColour(ISkin skin, Color4 expectedCatcherColour, Color4? expectedEndGlowColour = null)
+        private void checkHyperDashCatcherColour(ISkin skin, Color4 expectedCatcherColour, Color4? expectedAfterImageColour = null)
         {
-            CatcherArea catcherArea = null;
             CatcherTrailDisplay trails = null;
+            Catcher catcher = null;
 
             AddStep("create hyper-dashing catcher", () =>
             {
-                Child = setupSkinHierarchy(catcherArea = new TestCatcherArea
+                CatcherArea catcherArea;
+                Child = setupSkinHierarchy(new Container
                 {
                     Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre
+                    Child = catcherArea = new CatcherArea
+                    {
+                        Catcher = catcher = new Catcher(new DroppedObjectContainer())
+                        {
+                            Scale = new Vector2(4)
+                        }
+                    }
                 }, skin);
+                trails = catcherArea.ChildrenOfType<CatcherTrailDisplay>().Single();
             });
 
-            AddStep("get trails container", () =>
+            AddStep("start hyper-dash", () =>
             {
-                trails = catcherArea.OfType<CatcherTrailDisplay>().Single();
-                catcherArea.MovableCatcher.SetHyperDashState(2);
+                catcher.SetHyperDashState(2);
             });
 
-            AddUntilStep("catcher colour is correct", () => catcherArea.MovableCatcher.Colour == expectedCatcherColour);
+            AddUntilStep("catcher colour is correct", () => catcher.Colour == expectedCatcherColour);
 
             AddAssert("catcher trails colours are correct", () => trails.HyperDashTrailsColour == expectedCatcherColour);
-            AddAssert("catcher end-glow colours are correct", () => trails.EndGlowSpritesColour == (expectedEndGlowColour ?? expectedCatcherColour));
+            AddAssert("catcher after-image colours are correct", () => trails.HyperDashAfterImageColour == (expectedAfterImageColour ?? expectedCatcherColour));
 
             AddStep("finish hyper-dashing", () =>
             {
-                catcherArea.MovableCatcher.SetHyperDashState(1);
-                catcherArea.MovableCatcher.FinishTransforms();
+                catcher.SetHyperDashState();
+                catcher.FinishTransforms();
             });
 
-            AddAssert("catcher colour returned to white", () => catcherArea.MovableCatcher.Colour == Color4.White);
+            AddAssert("catcher colour returned to white", () => catcher.Colour == Color4.White);
         }
 
         private void checkHyperDashFruitColour(ISkin skin, Color4 expectedColour)
@@ -205,18 +212,5 @@ namespace osu.Game.Rulesets.Catch.Tests
             {
             }
         }
-
-        private class TestCatcherArea : CatcherArea
-        {
-            [Cached]
-            private readonly DroppedObjectContainer droppedObjectContainer;
-
-            public TestCatcherArea()
-            {
-                Scale = new Vector2(4f);
-
-                AddInternal(droppedObjectContainer = new DroppedObjectContainer());
-            }
-        }
     }
 }

osu.Game.Rulesets.Catch/Beatmaps/CatchBeatmapConverter.cs

@@ -23,7 +23,8 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
 
         protected override IEnumerable<CatchHitObject> ConvertHitObject(HitObject obj, IBeatmap beatmap, CancellationToken cancellationToken)
         {
-            var positionData = obj as IHasXPosition;
+            var xPositionData = obj as IHasXPosition;
+            var yPositionData = obj as IHasYPosition;
             var comboData = obj as IHasCombo;
 
             switch (obj)
@@ -36,10 +37,11 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
                         Path = curveData.Path,
                         NodeSamples = curveData.NodeSamples,
                         RepeatCount = curveData.RepeatCount,
-                        X = positionData?.X ?? 0,
+                        X = xPositionData?.X ?? 0,
                         NewCombo = comboData?.NewCombo ?? false,
                         ComboOffset = comboData?.ComboOffset ?? 0,
-                        LegacyLastTickOffset = (obj as IHasLegacyLastTickOffset)?.LegacyLastTickOffset ?? 0
+                        LegacyLastTickOffset = (obj as IHasLegacyLastTickOffset)?.LegacyLastTickOffset ?? 0,
+                        LegacyConvertedY = yPositionData?.Y ?? CatchHitObject.DEFAULT_LEGACY_CONVERT_Y
                     }.Yield();
 
                 case IHasDuration endTime:
@@ -59,7 +61,8 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
                         Samples = obj.Samples,
                         NewCombo = comboData?.NewCombo ?? false,
                         ComboOffset = comboData?.ComboOffset ?? 0,
-                        X = positionData?.X ?? 0
+                        X = xPositionData?.X ?? 0,
+                        LegacyConvertedY = yPositionData?.Y ?? CatchHitObject.DEFAULT_LEGACY_CONVERT_Y
                     }.Yield();
             }
         }

osu.Game.Rulesets.Catch/CatchRuleset.cs

@@ -130,7 +130,8 @@ namespace osu.Game.Rulesets.Catch
                     return new Mod[]
                     {
                         new MultiMod(new ModWindUp(), new ModWindDown()),
-                        new CatchModFloatingFruits()
+                        new CatchModFloatingFruits(),
+                        new CatchModMuted(),
                     };
 
                 default:

osu.Game.Rulesets.Catch/Difficulty/CatchPerformanceCalculator.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using osu.Framework.Extensions;
 using osu.Game.Rulesets.Difficulty;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Scoring;
@@ -33,11 +32,11 @@ namespace osu.Game.Rulesets.Catch.Difficulty
         {
             mods = Score.Mods;
 
-            fruitsHit = Score.Statistics.GetOrDefault(HitResult.Great);
-            ticksHit = Score.Statistics.GetOrDefault(HitResult.LargeTickHit);
-            tinyTicksHit = Score.Statistics.GetOrDefault(HitResult.SmallTickHit);
-            tinyTicksMissed = Score.Statistics.GetOrDefault(HitResult.SmallTickMiss);
-            misses = Score.Statistics.GetOrDefault(HitResult.Miss);
+            fruitsHit = Score.Statistics.GetValueOrDefault(HitResult.Great);
+            ticksHit = Score.Statistics.GetValueOrDefault(HitResult.LargeTickHit);
+            tinyTicksHit = Score.Statistics.GetValueOrDefault(HitResult.SmallTickHit);
+            tinyTicksMissed = Score.Statistics.GetValueOrDefault(HitResult.SmallTickMiss);
+            misses = Score.Statistics.GetValueOrDefault(HitResult.Miss);
 
             // We are heavily relying on aim in catch the beat
             double value = Math.Pow(5.0 * Math.Max(1.0, Attributes.StarRating / 0.0049) - 4.0, 2.0) / 100000.0;

osu.Game.Rulesets.Catch/Edit/Blueprints/CatchPlacementBlueprint.cs

@@ -6,6 +6,7 @@ using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.UI;
 using osu.Game.Rulesets.UI.Scrolling;
+using osuTK;
 
 namespace osu.Game.Rulesets.Catch.Edit.Blueprints
 {
@@ -23,5 +24,7 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
             : base(new THitObject())
         {
         }
+
+        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => true;
     }
 }

osu.Game.Rulesets.Catch/Edit/Blueprints/CatchSelectionBlueprint.cs

@@ -13,13 +13,14 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
     public abstract class CatchSelectionBlueprint<THitObject> : HitObjectSelectionBlueprint<THitObject>
         where THitObject : CatchHitObject
     {
+        protected override bool AlwaysShowWhenSelected => true;
+
         public override Vector2 ScreenSpaceSelectionPoint
         {
             get
             {
-                float x = HitObject.OriginalX;
-                float y = HitObjectContainer.PositionAtTime(HitObject.StartTime);
-                return HitObjectContainer.ToScreenSpace(new Vector2(x, y + HitObjectContainer.DrawHeight));
+                Vector2 position = CatchHitObjectUtils.GetStartPosition(HitObjectContainer, HitObject);
+                return HitObjectContainer.ToScreenSpace(position + new Vector2(0, HitObjectContainer.DrawHeight));
             }
         }
 

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/EditablePath.cs

@@ -0,0 +1,190 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using JetBrains.Annotations;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Primitives;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.UI.Scrolling;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public abstract class EditablePath : CompositeDrawable
+    {
+        public int PathId => path.InvalidationID;
+
+        public IReadOnlyList<JuiceStreamPathVertex> Vertices => path.Vertices;
+
+        public int VertexCount => path.Vertices.Count;
+
+        protected readonly Func<float, double> PositionToDistance;
+
+        protected IReadOnlyList<VertexState> VertexStates => vertexStates;
+
+        private readonly JuiceStreamPath path = new JuiceStreamPath();
+
+        // Invariant: `path.Vertices.Count == vertexStates.Count`
+        private readonly List<VertexState> vertexStates = new List<VertexState>
+        {
+            new VertexState { IsFixed = true }
+        };
+
+        private readonly List<VertexState> previousVertexStates = new List<VertexState>();
+
+        [Resolved(CanBeNull = true)]
+        [CanBeNull]
+        private IBeatSnapProvider beatSnapProvider { get; set; }
+
+        protected EditablePath(Func<float, double> positionToDistance)
+        {
+            PositionToDistance = positionToDistance;
+
+            Anchor = Anchor.BottomLeft;
+        }
+
+        public void UpdateFrom(ScrollingHitObjectContainer hitObjectContainer, JuiceStream hitObject)
+        {
+            while (path.Vertices.Count < InternalChildren.Count)
+                RemoveInternal(InternalChildren[^1]);
+
+            while (InternalChildren.Count < path.Vertices.Count)
+                AddInternal(new VertexPiece());
+
+            double distanceToYFactor = -hitObjectContainer.LengthAtTime(hitObject.StartTime, hitObject.StartTime + 1 / hitObject.Velocity);
+
+            for (int i = 0; i < VertexCount; i++)
+            {
+                var piece = (VertexPiece)InternalChildren[i];
+                var vertex = path.Vertices[i];
+                piece.Position = new Vector2(vertex.X, (float)(vertex.Distance * distanceToYFactor));
+                piece.UpdateFrom(vertexStates[i]);
+            }
+        }
+
+        public void InitializeFromHitObject(JuiceStream hitObject)
+        {
+            var sliderPath = hitObject.Path;
+            path.ConvertFromSliderPath(sliderPath);
+
+            // If the original slider path has non-linear type segments, resample the vertices at nested hit object times to reduce the number of vertices.
+            if (sliderPath.ControlPoints.Any(p => p.Type.Value != null && p.Type.Value != PathType.Linear))
+            {
+                path.ResampleVertices(hitObject.NestedHitObjects
+                                               .Skip(1).TakeWhile(h => !(h is Fruit)) // Only droplets in the first span are used.
+                                               .Select(h => (h.StartTime - hitObject.StartTime) * hitObject.Velocity));
+            }
+
+            vertexStates.Clear();
+            vertexStates.AddRange(path.Vertices.Select((_, i) => new VertexState
+            {
+                IsFixed = i == 0
+            }));
+        }
+
+        public void UpdateHitObjectFromPath(JuiceStream hitObject)
+        {
+            path.ConvertToSliderPath(hitObject.Path, hitObject.LegacyConvertedY);
+
+            if (beatSnapProvider == null) return;
+
+            double endTime = hitObject.StartTime + path.Distance / hitObject.Velocity;
+            double snappedEndTime = beatSnapProvider.SnapTime(endTime, hitObject.StartTime);
+            hitObject.Path.ExpectedDistance.Value = (snappedEndTime - hitObject.StartTime) * hitObject.Velocity;
+        }
+
+        public Vector2 ToRelativePosition(Vector2 screenSpacePosition)
+        {
+            return ToLocalSpace(screenSpacePosition) - new Vector2(0, DrawHeight);
+        }
+
+        protected override bool ComputeIsMaskedAway(RectangleF maskingBounds) => false;
+
+        protected int AddVertex(double distance, float x)
+        {
+            int index = path.InsertVertex(distance);
+            path.SetVertexPosition(index, x);
+            vertexStates.Insert(index, new VertexState());
+
+            correctFixedVertexPositions();
+
+            Debug.Assert(vertexStates.Count == VertexCount);
+            return index;
+        }
+
+        protected bool RemoveVertex(int index)
+        {
+            if (index < 0 || index >= path.Vertices.Count)
+                return false;
+
+            if (vertexStates[index].IsFixed)
+                return false;
+
+            path.RemoveVertices((_, i) => i == index);
+
+            vertexStates.RemoveAt(index);
+            if (vertexStates.Count == 0)
+                vertexStates.Add(new VertexState());
+
+            Debug.Assert(vertexStates.Count == VertexCount);
+            return true;
+        }
+
+        protected void MoveSelectedVertices(double distanceDelta, float xDelta)
+        {
+            // Because the vertex list may be reordered due to distance change, the state list must be reordered as well.
+            previousVertexStates.Clear();
+            previousVertexStates.AddRange(vertexStates);
+
+            // We will recreate the path from scratch. Note that `Clear` leaves the first vertex.
+            int vertexCount = VertexCount;
+            path.Clear();
+            vertexStates.RemoveRange(1, vertexCount - 1);
+
+            for (int i = 1; i < vertexCount; i++)
+            {
+                var state = previousVertexStates[i];
+                double distance = state.VertexBeforeChange.Distance;
+                if (state.IsSelected)
+                    distance += distanceDelta;
+
+                int newIndex = path.InsertVertex(Math.Max(0, distance));
+                vertexStates.Insert(newIndex, state);
+            }
+
+            // First, restore positions of the non-selected vertices.
+            for (int i = 0; i < vertexCount; i++)
+            {
+                if (!vertexStates[i].IsSelected && !vertexStates[i].IsFixed)
+                    path.SetVertexPosition(i, vertexStates[i].VertexBeforeChange.X);
+            }
+
+            // Then, move the selected vertices.
+            for (int i = 0; i < vertexCount; i++)
+            {
+                if (vertexStates[i].IsSelected && !vertexStates[i].IsFixed)
+                    path.SetVertexPosition(i, vertexStates[i].VertexBeforeChange.X + xDelta);
+            }
+
+            // Finally, correct the position of fixed vertices.
+            correctFixedVertexPositions();
+        }
+
+        private void correctFixedVertexPositions()
+        {
+            for (int i = 0; i < VertexCount; i++)
+            {
+                if (vertexStates[i].IsFixed)
+                    path.SetVertexPosition(i, vertexStates[i].VertexBeforeChange.X);
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/FruitOutline.cs

@@ -7,7 +7,6 @@ using osu.Framework.Graphics.Containers;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Catch.Skinning.Default;
-using osu.Game.Rulesets.UI.Scrolling;
 using osuTK;
 
 namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
@@ -18,7 +17,6 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
         {
             Anchor = Anchor.BottomLeft;
             Origin = Anchor.Centre;
-            Size = new Vector2(2 * CatchHitObject.OBJECT_RADIUS);
             InternalChild = new BorderPiece();
         }
 
@@ -28,10 +26,8 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
             Colour = osuColour.Yellow;
         }
 
-        public void UpdateFrom(ScrollingHitObjectContainer hitObjectContainer, CatchHitObject hitObject)
+        public void UpdateFrom(CatchHitObject hitObject)
         {
-            X = hitObject.EffectiveX;
-            Y = hitObjectContainer.PositionAtTime(hitObject.StartTime);
             Scale = new Vector2(hitObject.Scale);
         }
     }

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/NestedOutlineContainer.cs

@@ -0,0 +1,48 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Primitives;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.UI.Scrolling;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public class NestedOutlineContainer : CompositeDrawable
+    {
+        private readonly List<CatchHitObject> nestedHitObjects = new List<CatchHitObject>();
+
+        public NestedOutlineContainer()
+        {
+            Anchor = Anchor.BottomLeft;
+        }
+
+        public void UpdateNestedObjectsFrom(ScrollingHitObjectContainer hitObjectContainer, CatchHitObject parentHitObject)
+        {
+            nestedHitObjects.Clear();
+            nestedHitObjects.AddRange(parentHitObject.NestedHitObjects
+                                                     .OfType<CatchHitObject>()
+                                                     .Where(h => !(h is TinyDroplet)));
+
+            while (nestedHitObjects.Count < InternalChildren.Count)
+                RemoveInternal(InternalChildren[^1]);
+
+            while (InternalChildren.Count < nestedHitObjects.Count)
+                AddInternal(new FruitOutline());
+
+            for (int i = 0; i < nestedHitObjects.Count; i++)
+            {
+                var hitObject = nestedHitObjects[i];
+                var outline = (FruitOutline)InternalChildren[i];
+                outline.Position = CatchHitObjectUtils.GetStartPosition(hitObjectContainer, hitObject) - Position;
+                outline.UpdateFrom(hitObject);
+                outline.Scale *= hitObject is Droplet ? 0.5f : 1;
+            }
+        }
+
+        protected override bool ComputeIsMaskedAway(RectangleF maskingBounds) => false;
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/PlacementEditablePath.cs

@@ -0,0 +1,49 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Game.Rulesets.Catch.Objects;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public class PlacementEditablePath : EditablePath
+    {
+        /// <summary>
+        /// The original position of the last added vertex.
+        /// This is not same as the last vertex of the current path because the vertex ordering can change.
+        /// </summary>
+        private JuiceStreamPathVertex lastVertex;
+
+        public PlacementEditablePath(Func<float, double> positionToDistance)
+            : base(positionToDistance)
+        {
+        }
+
+        public void AddNewVertex()
+        {
+            var endVertex = Vertices[^1];
+            int index = AddVertex(endVertex.Distance, endVertex.X);
+
+            for (int i = 0; i < VertexCount; i++)
+            {
+                VertexStates[i].IsSelected = i == index;
+                VertexStates[i].IsFixed = i != index;
+                VertexStates[i].VertexBeforeChange = Vertices[i];
+            }
+
+            lastVertex = Vertices[index];
+        }
+
+        /// <summary>
+        /// Move the vertex added by <see cref="AddNewVertex"/> in the last time.
+        /// </summary>
+        public void MoveLastVertex(Vector2 screenSpacePosition)
+        {
+            Vector2 position = ToRelativePosition(screenSpacePosition);
+            double distanceDelta = PositionToDistance(position.Y) - lastVertex.Distance;
+            float xDelta = position.X - lastVertex.X;
+            MoveSelectedVertices(distanceDelta, xDelta);
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/ScrollingPath.cs

@@ -0,0 +1,77 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Lines;
+using osu.Framework.Graphics.Primitives;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.UI.Scrolling;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public class ScrollingPath : CompositeDrawable
+    {
+        private readonly Path drawablePath;
+
+        private readonly List<(double Distance, float X)> vertices = new List<(double, float)>();
+
+        public ScrollingPath()
+        {
+            Anchor = Anchor.BottomLeft;
+
+            InternalChildren = new Drawable[]
+            {
+                drawablePath = new SmoothPath
+                {
+                    PathRadius = 2,
+                    Alpha = 0.5f
+                },
+            };
+        }
+
+        public void UpdatePathFrom(ScrollingHitObjectContainer hitObjectContainer, JuiceStream hitObject)
+        {
+            double distanceToYFactor = -hitObjectContainer.LengthAtTime(hitObject.StartTime, hitObject.StartTime + 1 / hitObject.Velocity);
+
+            computeDistanceXs(hitObject);
+            drawablePath.Vertices = vertices
+                                    .Select(v => new Vector2(v.X, (float)(v.Distance * distanceToYFactor)))
+                                    .ToArray();
+            drawablePath.OriginPosition = drawablePath.PositionInBoundingBox(Vector2.Zero);
+        }
+
+        private void computeDistanceXs(JuiceStream hitObject)
+        {
+            vertices.Clear();
+
+            var sliderVertices = new List<Vector2>();
+            hitObject.Path.GetPathToProgress(sliderVertices, 0, 1);
+
+            if (sliderVertices.Count == 0)
+                return;
+
+            double distance = 0;
+            Vector2 lastPosition = Vector2.Zero;
+
+            for (int repeat = 0; repeat < hitObject.RepeatCount + 1; repeat++)
+            {
+                foreach (var position in sliderVertices)
+                {
+                    distance += Vector2.Distance(lastPosition, position);
+                    lastPosition = position;
+
+                    vertices.Add((distance, position.X));
+                }
+
+                sliderVertices.Reverse();
+            }
+        }
+
+        // Because this has 0x0 size, the contents are otherwise masked away if the start position is outside the screen.
+        protected override bool ComputeIsMaskedAway(RectangleF maskingBounds) => false;
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/SelectionEditablePath.cs

@@ -0,0 +1,130 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using JetBrains.Annotations;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics.Cursor;
+using osu.Framework.Graphics.UserInterface;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Screens.Edit;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public class SelectionEditablePath : EditablePath, IHasContextMenu
+    {
+        public MenuItem[] ContextMenuItems => getContextMenuItems().ToArray();
+
+        // To handle when the editor is scrolled while dragging.
+        private Vector2 dragStartPosition;
+
+        [Resolved(CanBeNull = true)]
+        [CanBeNull]
+        private IEditorChangeHandler changeHandler { get; set; }
+
+        public SelectionEditablePath(Func<float, double> positionToDistance)
+            : base(positionToDistance)
+        {
+        }
+
+        public void AddVertex(Vector2 relativePosition)
+        {
+            double distance = Math.Max(0, PositionToDistance(relativePosition.Y));
+            int index = AddVertex(distance, relativePosition.X);
+            selectOnly(index);
+        }
+
+        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => InternalChildren.Any(d => d.ReceivePositionalInputAt(screenSpacePos));
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            int index = getMouseTargetVertex(e.ScreenSpaceMouseDownPosition);
+            if (index == -1 || VertexStates[index].IsFixed)
+                return false;
+
+            if (e.Button == MouseButton.Left && e.ShiftPressed)
+            {
+                RemoveVertex(index);
+                return true;
+            }
+
+            if (e.ControlPressed)
+                VertexStates[index].IsSelected = !VertexStates[index].IsSelected;
+            else if (!VertexStates[index].IsSelected)
+                selectOnly(index);
+
+            // Don't inhibit right click, to show the context menu
+            return e.Button != MouseButton.Right;
+        }
+
+        protected override bool OnDragStart(DragStartEvent e)
+        {
+            int index = getMouseTargetVertex(e.ScreenSpaceMouseDownPosition);
+            if (index == -1 || VertexStates[index].IsFixed)
+                return false;
+
+            if (e.Button != MouseButton.Left)
+                return false;
+
+            dragStartPosition = ToRelativePosition(e.ScreenSpaceMouseDownPosition);
+
+            for (int i = 0; i < VertexCount; i++)
+                VertexStates[i].VertexBeforeChange = Vertices[i];
+
+            changeHandler?.BeginChange();
+            return true;
+        }
+
+        protected override void OnDrag(DragEvent e)
+        {
+            Vector2 mousePosition = ToRelativePosition(e.ScreenSpaceMousePosition);
+            double distanceDelta = PositionToDistance(mousePosition.Y) - PositionToDistance(dragStartPosition.Y);
+            float xDelta = mousePosition.X - dragStartPosition.X;
+            MoveSelectedVertices(distanceDelta, xDelta);
+        }
+
+        protected override void OnDragEnd(DragEndEvent e)
+        {
+            changeHandler?.EndChange();
+        }
+
+        private int getMouseTargetVertex(Vector2 screenSpacePosition)
+        {
+            for (int i = InternalChildren.Count - 1; i >= 0; i--)
+            {
+                if (i < VertexCount && InternalChildren[i].ReceivePositionalInputAt(screenSpacePosition))
+                    return i;
+            }
+
+            return -1;
+        }
+
+        private IEnumerable<MenuItem> getContextMenuItems()
+        {
+            int selectedCount = VertexStates.Count(state => state.IsSelected);
+
+            if (selectedCount != 0)
+                yield return new OsuMenuItem($"Delete selected {(selectedCount == 1 ? "vertex" : $"{selectedCount} vertices")}", MenuItemType.Destructive, deleteSelectedVertices);
+        }
+
+        private void selectOnly(int index)
+        {
+            for (int i = 0; i < VertexCount; i++)
+                VertexStates[i].IsSelected = i == index;
+        }
+
+        private void deleteSelectedVertices()
+        {
+            for (int i = VertexCount - 1; i >= 0; i--)
+            {
+                if (VertexStates[i].IsSelected)
+                    RemoveVertex(i);
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/VertexPiece.cs

@@ -0,0 +1,31 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    public class VertexPiece : Circle
+    {
+        [Resolved]
+        private OsuColour osuColour { get; set; }
+
+        public VertexPiece()
+        {
+            Anchor = Anchor.BottomLeft;
+            Origin = Anchor.Centre;
+            Size = new Vector2(15);
+        }
+
+        public void UpdateFrom(VertexState state)
+        {
+            Colour = state.IsSelected ? osuColour.Yellow.Lighten(1) : osuColour.Yellow;
+            Alpha = state.IsFixed ? 0.5f : 1;
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/VertexState.cs

@@ -0,0 +1,31 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Rulesets.Catch.Objects;
+
+#nullable enable
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
+{
+    /// <summary>
+    /// Holds the state of a vertex in the path of a <see cref="EditablePath"/>.
+    /// </summary>
+    public class VertexState
+    {
+        /// <summary>
+        /// Whether the vertex is selected.
+        /// </summary>
+        public bool IsSelected { get; set; }
+
+        /// <summary>
+        /// Whether the vertex can be moved or deleted.
+        /// </summary>
+        public bool IsFixed { get; set; }
+
+        /// <summary>
+        /// The position of the vertex before a vertex moving operation starts.
+        /// This is used to implement "memory-less" moving operations (only the final position matters) to improve UX.
+        /// </summary>
+        public JuiceStreamPathVertex VertexBeforeChange { get; set; }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/FruitPlacementBlueprint.cs

@@ -29,7 +29,8 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
         {
             base.Update();
 
-            outline.UpdateFrom(HitObjectContainer, HitObject);
+            outline.Position = CatchHitObjectUtils.GetStartPosition(HitObjectContainer, HitObject);
+            outline.UpdateFrom(HitObject);
         }
 
         protected override bool OnMouseDown(MouseDownEvent e)

osu.Game.Rulesets.Catch/Edit/Blueprints/FruitSelectionBlueprint.cs

@@ -20,8 +20,10 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
         {
             base.Update();
 
-            if (IsSelected)
-                outline.UpdateFrom(HitObjectContainer, HitObject);
+            if (!IsSelected) return;
+
+            outline.Position = CatchHitObjectUtils.GetStartPosition(HitObjectContainer, HitObject);
+            outline.UpdateFrom(HitObject);
         }
     }
 }

osu.Game.Rulesets.Catch/Edit/Blueprints/JuiceStreamPlacementBlueprint.cs

@@ -0,0 +1,128 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Graphics;
+using osu.Framework.Input;
+using osu.Framework.Input.Events;
+using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Catch.Edit.Blueprints
+{
+    public class JuiceStreamPlacementBlueprint : CatchPlacementBlueprint<JuiceStream>
+    {
+        private readonly ScrollingPath scrollingPath;
+
+        private readonly NestedOutlineContainer nestedOutlineContainer;
+
+        private readonly PlacementEditablePath editablePath;
+
+        private int lastEditablePathId = -1;
+
+        private InputManager inputManager;
+
+        public JuiceStreamPlacementBlueprint()
+        {
+            InternalChildren = new Drawable[]
+            {
+                scrollingPath = new ScrollingPath(),
+                nestedOutlineContainer = new NestedOutlineContainer(),
+                editablePath = new PlacementEditablePath(positionToDistance)
+            };
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            if (PlacementActive == PlacementState.Active)
+                editablePath.UpdateFrom(HitObjectContainer, HitObject);
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            inputManager = GetContainingInputManager();
+        }
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            switch (PlacementActive)
+            {
+                case PlacementState.Waiting:
+                    if (e.Button != MouseButton.Left) break;
+
+                    editablePath.AddNewVertex();
+                    BeginPlacement(true);
+                    return true;
+
+                case PlacementState.Active:
+                    switch (e.Button)
+                    {
+                        case MouseButton.Left:
+                            editablePath.AddNewVertex();
+                            return true;
+
+                        case MouseButton.Right:
+                            EndPlacement(HitObject.Duration > 0);
+                            return true;
+                    }
+
+                    break;
+            }
+
+            return base.OnMouseDown(e);
+        }
+
+        public override void UpdateTimeAndPosition(SnapResult result)
+        {
+            switch (PlacementActive)
+            {
+                case PlacementState.Waiting:
+                    if (!(result.Time is double snappedTime)) return;
+
+                    HitObject.OriginalX = ToLocalSpace(result.ScreenSpacePosition).X;
+                    HitObject.StartTime = snappedTime;
+                    break;
+
+                case PlacementState.Active:
+                    Vector2 unsnappedPosition = inputManager.CurrentState.Mouse.Position;
+                    editablePath.MoveLastVertex(unsnappedPosition);
+                    break;
+
+                default:
+                    return;
+            }
+
+            // Make sure the up-to-date position is used for outlines.
+            Vector2 startPosition = CatchHitObjectUtils.GetStartPosition(HitObjectContainer, HitObject);
+            editablePath.Position = nestedOutlineContainer.Position = scrollingPath.Position = startPosition;
+
+            updateHitObjectFromPath();
+        }
+
+        private void updateHitObjectFromPath()
+        {
+            if (lastEditablePathId == editablePath.PathId)
+                return;
+
+            editablePath.UpdateHitObjectFromPath(HitObject);
+            ApplyDefaultsToHitObject();
+
+            scrollingPath.UpdatePathFrom(HitObjectContainer, HitObject);
+            nestedOutlineContainer.UpdateNestedObjectsFrom(HitObjectContainer, HitObject);
+
+            lastEditablePathId = editablePath.PathId;
+        }
+
+        private double positionToDistance(float relativeYPosition)
+        {
+            double time = HitObjectContainer.TimeAtPosition(relativeYPosition, HitObject.StartTime);
+            return (time - HitObject.StartTime) * HitObject.Velocity;
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Blueprints/JuiceStreamSelectionBlueprint.cs

@@ -1,12 +1,22 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System.Collections.Generic;
 using System.Linq;
+using JetBrains.Annotations;
 using osu.Framework.Allocation;
+using osu.Framework.Caching;
+using osu.Framework.Graphics;
 using osu.Framework.Graphics.Primitives;
+using osu.Framework.Graphics.UserInterface;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Rulesets.Catch.Edit.Blueprints.Components;
 using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Objects;
+using osu.Game.Screens.Edit;
 using osuTK;
+using osuTK.Input;
 
 namespace osu.Game.Rulesets.Catch.Edit.Blueprints
 {
@@ -14,12 +24,46 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
     {
         public override Quad SelectionQuad => HitObjectContainer.ToScreenSpace(getBoundingBox().Offset(new Vector2(0, HitObjectContainer.DrawHeight)));
 
+        public override MenuItem[] ContextMenuItems => getContextMenuItems().ToArray();
+
         private float minNestedX;
         private float maxNestedX;
 
+        private readonly ScrollingPath scrollingPath;
+
+        private readonly NestedOutlineContainer nestedOutlineContainer;
+
+        private readonly Cached pathCache = new Cached();
+
+        private readonly SelectionEditablePath editablePath;
+
+        /// <summary>
+        /// The <see cref="JuiceStreamPath.InvalidationID"/> of the <see cref="JuiceStreamPath"/> corresponding the current <see cref="SliderPath"/> of the hit object.
+        /// When the path is edited, the change is detected and the <see cref="SliderPath"/> of the hit object is updated.
+        /// </summary>
+        private int lastEditablePathId = -1;
+
+        /// <summary>
+        /// The <see cref="SliderPath.Version"/> of the current <see cref="SliderPath"/> of the hit object.
+        /// When the <see cref="SliderPath"/> of the hit object is changed by external means, the change is detected and the <see cref="JuiceStreamPath"/> is re-initialized.
+        /// </summary>
+        private int lastSliderPathVersion = -1;
+
+        private Vector2 rightMouseDownPosition;
+
+        [Resolved(CanBeNull = true)]
+        [CanBeNull]
+        private EditorBeatmap editorBeatmap { get; set; }
+
         public JuiceStreamSelectionBlueprint(JuiceStream hitObject)
             : base(hitObject)
         {
+            InternalChildren = new Drawable[]
+            {
+                scrollingPath = new ScrollingPath(),
+                nestedOutlineContainer = new NestedOutlineContainer(),
+                editablePath = new SelectionEditablePath(positionToDistance)
+            };
         }
 
         [BackgroundDependencyLoader]
@@ -29,7 +73,61 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
             computeObjectBounds();
         }
 
-        private void onDefaultsApplied(HitObject _) => computeObjectBounds();
+        protected override void Update()
+        {
+            base.Update();
+
+            if (!IsSelected) return;
+
+            if (editablePath.PathId != lastEditablePathId)
+                updateHitObjectFromPath();
+
+            Vector2 startPosition = CatchHitObjectUtils.GetStartPosition(HitObjectContainer, HitObject);
+            editablePath.Position = nestedOutlineContainer.Position = scrollingPath.Position = startPosition;
+
+            editablePath.UpdateFrom(HitObjectContainer, HitObject);
+
+            if (pathCache.IsValid) return;
+
+            scrollingPath.UpdatePathFrom(HitObjectContainer, HitObject);
+            nestedOutlineContainer.UpdateNestedObjectsFrom(HitObjectContainer, HitObject);
+
+            pathCache.Validate();
+        }
+
+        protected override void OnSelected()
+        {
+            initializeJuiceStreamPath();
+            base.OnSelected();
+        }
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            if (!IsSelected) return base.OnMouseDown(e);
+
+            switch (e.Button)
+            {
+                case MouseButton.Left when e.ControlPressed:
+                    editablePath.AddVertex(editablePath.ToRelativePosition(e.ScreenSpaceMouseDownPosition));
+                    return true;
+
+                case MouseButton.Right:
+                    // Record the mouse position to be used in the "add vertex" action.
+                    rightMouseDownPosition = editablePath.ToRelativePosition(e.ScreenSpaceMouseDownPosition);
+                    break;
+            }
+
+            return base.OnMouseDown(e);
+        }
+
+        private void onDefaultsApplied(HitObject _)
+        {
+            computeObjectBounds();
+            pathCache.Invalidate();
+
+            if (lastSliderPathVersion != HitObject.Path.Version.Value)
+                initializeJuiceStreamPath();
+        }
 
         private void computeObjectBounds()
         {
@@ -47,6 +145,38 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints
             return new RectangleF(left, top, right - left, bottom - top).Inflate(objectRadius);
         }
 
+        private double positionToDistance(float relativeYPosition)
+        {
+            double time = HitObjectContainer.TimeAtPosition(relativeYPosition, HitObject.StartTime);
+            return (time - HitObject.StartTime) * HitObject.Velocity;
+        }
+
+        private void initializeJuiceStreamPath()
+        {
+            editablePath.InitializeFromHitObject(HitObject);
+
+            // Record the current ID to update the hit object only when a change is made to the path.
+            lastEditablePathId = editablePath.PathId;
+            lastSliderPathVersion = HitObject.Path.Version.Value;
+        }
+
+        private void updateHitObjectFromPath()
+        {
+            editablePath.UpdateHitObjectFromPath(HitObject);
+            editorBeatmap?.Update(HitObject);
+
+            lastEditablePathId = editablePath.PathId;
+            lastSliderPathVersion = HitObject.Path.Version.Value;
+        }
+
+        private IEnumerable<MenuItem> getContextMenuItems()
+        {
+            yield return new OsuMenuItem("Add vertex", MenuItemType.Standard, () =>
+            {
+                editablePath.AddVertex(rightMouseDownPosition);
+            });
+        }
+
         protected override void Dispose(bool isDisposing)
         {
             base.Dispose(isDisposing);

osu.Game.Rulesets.Catch/Edit/CatchEditorPlayfield.cs

@@ -19,7 +19,7 @@ namespace osu.Game.Rulesets.Catch.Edit
             base.LoadComplete();
 
             // TODO: honor "hit animation" setting?
-            CatcherArea.MovableCatcher.CatchFruitOnPlate = false;
+            Catcher.CatchFruitOnPlate = false;
 
             // TODO: disable hit lighting as well
         }

osu.Game.Rulesets.Catch/Edit/CatchHitObjectComposer.cs

@@ -2,6 +2,8 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Edit;
@@ -20,12 +22,23 @@ namespace osu.Game.Rulesets.Catch.Edit
         {
         }
 
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            LayerBelowRuleset.Add(new PlayfieldBorder
+            {
+                RelativeSizeAxes = Axes.Both,
+                PlayfieldBorderStyle = { Value = PlayfieldBorderStyle.Corners }
+            });
+        }
+
         protected override DrawableRuleset<CatchHitObject> CreateDrawableRuleset(Ruleset ruleset, IBeatmap beatmap, IReadOnlyList<Mod> mods = null) =>
             new DrawableCatchEditorRuleset(ruleset, beatmap, mods);
 
         protected override IReadOnlyList<HitObjectCompositionTool> CompositionTools => new HitObjectCompositionTool[]
         {
             new FruitCompositionTool(),
+            new JuiceStreamCompositionTool(),
             new BananaShowerCompositionTool()
         };
 

osu.Game.Rulesets.Catch/Edit/CatchHitObjectUtils.cs

@@ -0,0 +1,63 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.UI.Scrolling;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    /// <summary>
+    /// Utility functions used by the editor.
+    /// </summary>
+    public static class CatchHitObjectUtils
+    {
+        /// <summary>
+        /// Get the position of the hit object in the playfield based on <see cref="CatchHitObject.OriginalX"/> and <see cref="HitObject.StartTime"/>.
+        /// </summary>
+        public static Vector2 GetStartPosition(ScrollingHitObjectContainer hitObjectContainer, CatchHitObject hitObject)
+        {
+            return new Vector2(hitObject.OriginalX, hitObjectContainer.PositionAtTime(hitObject.StartTime));
+        }
+
+        /// <summary>
+        /// Get the range of horizontal position occupied by the hit object.
+        /// </summary>
+        /// <remarks>
+        /// <see cref="TinyDroplet"/>s are excluded and returns <see cref="PositionRange.EMPTY"/>.
+        /// </remarks>
+        public static PositionRange GetPositionRange(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case Fruit fruit:
+                    return new PositionRange(fruit.OriginalX);
+
+                case Droplet droplet:
+                    return droplet is TinyDroplet ? PositionRange.EMPTY : new PositionRange(droplet.OriginalX);
+
+                case JuiceStream _:
+                    return GetPositionRange(hitObject.NestedHitObjects);
+
+                case BananaShower _:
+                    // A banana shower occupies the whole screen width.
+                    return new PositionRange(0, CatchPlayfield.WIDTH);
+
+                default:
+                    return PositionRange.EMPTY;
+            }
+        }
+
+        /// <summary>
+        /// Get the range of horizontal position occupied by the hit objects.
+        /// </summary>
+        /// <remarks>
+        /// <see cref="TinyDroplet"/>s are excluded.
+        /// </remarks>
+        public static PositionRange GetPositionRange(IEnumerable<HitObject> hitObjects) => hitObjects.Select(GetPositionRange).Aggregate(PositionRange.EMPTY, PositionRange.Union);
+    }
+}

osu.Game.Rulesets.Catch/Edit/CatchSelectionHandler.cs

@@ -1,14 +1,18 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Allocation;
 using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.UI;
 using osu.Game.Rulesets.UI.Scrolling;
 using osu.Game.Screens.Edit.Compose.Components;
 using osuTK;
+using Direction = osu.Framework.Graphics.Direction;
 
 namespace osu.Game.Rulesets.Catch.Edit
 {
@@ -24,23 +28,114 @@ namespace osu.Game.Rulesets.Catch.Edit
             var blueprint = moveEvent.Blueprint;
             Vector2 originalPosition = HitObjectContainer.ToLocalSpace(blueprint.ScreenSpaceSelectionPoint);
             Vector2 targetPosition = HitObjectContainer.ToLocalSpace(blueprint.ScreenSpaceSelectionPoint + moveEvent.ScreenSpaceDelta);
+
             float deltaX = targetPosition.X - originalPosition.X;
+            deltaX = limitMovement(deltaX, SelectedItems);
+
+            if (deltaX == 0)
+            {
+                // Even if there is no positional change, there may be a time change.
+                return true;
+            }
 
             EditorBeatmap.PerformOnSelection(h =>
             {
-                if (!(h is CatchHitObject hitObject)) return;
+                if (!(h is CatchHitObject catchObject)) return;
 
-                if (hitObject is BananaShower) return;
-
-                // TODO: confine in bounds
-                hitObject.OriginalXBindable.Value += deltaX;
+                catchObject.OriginalX += deltaX;
 
                 // Move the nested hit objects to give an instant result before nested objects are recreated.
-                foreach (var nested in hitObject.NestedHitObjects.OfType<CatchHitObject>())
-                    nested.OriginalXBindable.Value += deltaX;
+                foreach (var nested in catchObject.NestedHitObjects.OfType<CatchHitObject>())
+                    nested.OriginalX += deltaX;
             });
 
             return true;
         }
+
+        public override bool HandleFlip(Direction direction)
+        {
+            var selectionRange = CatchHitObjectUtils.GetPositionRange(SelectedItems);
+
+            bool changed = false;
+            EditorBeatmap.PerformOnSelection(h =>
+            {
+                if (h is CatchHitObject catchObject)
+                    changed |= handleFlip(selectionRange, catchObject);
+            });
+            return changed;
+        }
+
+        public override bool HandleReverse()
+        {
+            double selectionStartTime = SelectedItems.Min(h => h.StartTime);
+            double selectionEndTime = SelectedItems.Max(h => h.GetEndTime());
+
+            EditorBeatmap.PerformOnSelection(hitObject =>
+            {
+                hitObject.StartTime = selectionEndTime - (hitObject.GetEndTime() - selectionStartTime);
+
+                if (hitObject is JuiceStream juiceStream)
+                {
+                    juiceStream.Path.Reverse(out Vector2 positionalOffset);
+                    juiceStream.OriginalX += positionalOffset.X;
+                    juiceStream.LegacyConvertedY += positionalOffset.Y;
+                    EditorBeatmap.Update(juiceStream);
+                }
+            });
+            return true;
+        }
+
+        protected override void OnSelectionChanged()
+        {
+            base.OnSelectionChanged();
+
+            var selectionRange = CatchHitObjectUtils.GetPositionRange(SelectedItems);
+            SelectionBox.CanFlipX = selectionRange.Length > 0 && SelectedItems.Any(h => h is CatchHitObject && !(h is BananaShower));
+            SelectionBox.CanReverse = SelectedItems.Count > 1 || SelectedItems.Any(h => h is JuiceStream);
+        }
+
+        /// <summary>
+        /// Limit positional movement of the objects by the constraint that moved objects should stay in bounds.
+        /// </summary>
+        /// <param name="deltaX">The positional movement.</param>
+        /// <param name="movingObjects">The objects to be moved.</param>
+        /// <returns>The positional movement with the restriction applied.</returns>
+        private float limitMovement(float deltaX, IEnumerable<HitObject> movingObjects)
+        {
+            var range = CatchHitObjectUtils.GetPositionRange(movingObjects);
+            // To make an object with position `x` stay in bounds after `deltaX` movement, `0 <= x + deltaX <= WIDTH` should be satisfied.
+            // Subtracting `x`, we get `-x <= deltaX <= WIDTH - x`.
+            // We only need to apply the inequality to extreme values of `x`.
+            float lowerBound = -range.Min;
+            float upperBound = CatchPlayfield.WIDTH - range.Max;
+            // The inequality may be unsatisfiable if the objects were already out of bounds.
+            // In that case, don't move objects at all.
+            if (lowerBound > upperBound)
+                return 0;
+
+            return Math.Clamp(deltaX, lowerBound, upperBound);
+        }
+
+        private bool handleFlip(PositionRange selectionRange, CatchHitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case BananaShower _:
+                    return false;
+
+                case JuiceStream juiceStream:
+                    juiceStream.OriginalX = selectionRange.GetFlippedPosition(juiceStream.OriginalX);
+
+                    foreach (var point in juiceStream.Path.ControlPoints)
+                        point.Position.Value *= new Vector2(-1, 1);
+
+                    EditorBeatmap.Update(juiceStream);
+                    return true;
+
+                default:
+                    hitObject.OriginalX = selectionRange.GetFlippedPosition(hitObject.OriginalX);
+                    return true;
+            }
+        }
     }
 }

osu.Game.Rulesets.Catch/Edit/JuiceStreamCompositionTool.cs

@@ -0,0 +1,24 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Graphics;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Edit.Blueprints;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Tools;
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    public class JuiceStreamCompositionTool : HitObjectCompositionTool
+    {
+        public JuiceStreamCompositionTool()
+            : base(nameof(JuiceStream))
+        {
+        }
+
+        public override Drawable CreateIcon() => new BeatmapStatisticIcon(BeatmapStatisticsIconType.Sliders);
+
+        public override PlacementBlueprint CreatePlacementBlueprint() => new JuiceStreamPlacementBlueprint();
+    }
+}

osu.Game.Rulesets.Catch/Edit/PositionRange.cs

@@ -0,0 +1,42 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+
+#nullable enable
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    /// <summary>
+    /// Represents either the empty range or a closed interval of horizontal positions in the playfield.
+    /// A <see cref="PositionRange"/> represents a closed interval if it is <see cref="Min"/> &lt;= <see cref="Max"/>, and represents the empty range otherwise.
+    /// </summary>
+    public readonly struct PositionRange
+    {
+        public readonly float Min;
+        public readonly float Max;
+
+        public float Length => Math.Max(0, Max - Min);
+
+        public PositionRange(float value)
+            : this(value, value)
+        {
+        }
+
+        public PositionRange(float min, float max)
+        {
+            Min = min;
+            Max = max;
+        }
+
+        public static PositionRange Union(PositionRange a, PositionRange b) => new PositionRange(Math.Min(a.Min, b.Min), Math.Max(a.Max, b.Max));
+
+        /// <summary>
+        /// Get the given position flipped (mirrored) for the axis at the center of this range.
+        /// Returns the given position unchanged if the range was empty.
+        /// </summary>
+        public float GetFlippedPosition(float x) => Min <= Max ? Max - (x - Min) : x;
+
+        public static readonly PositionRange EMPTY = new PositionRange(float.PositiveInfinity, float.NegativeInfinity);
+    }
+}

osu.Game.Rulesets.Catch/Mods/CatchModDifficultyAdjust.cs

@@ -12,37 +12,29 @@ namespace osu.Game.Rulesets.Catch.Mods
 {
     public class CatchModDifficultyAdjust : ModDifficultyAdjust, IApplicableToBeatmapProcessor
     {
-        [SettingSource("Circle Size", "Override a beatmap's set CS.", FIRST_SETTING_ORDER - 1)]
-        public BindableNumber<float> CircleSize { get; } = new BindableFloatWithLimitExtension
+        [SettingSource("Circle Size", "Override a beatmap's set CS.", FIRST_SETTING_ORDER - 1, SettingControlType = typeof(DifficultyAdjustSettingsControl))]
+        public DifficultyBindable CircleSize { get; } = new DifficultyBindable
         {
             Precision = 0.1f,
             MinValue = 1,
             MaxValue = 10,
-            Default = 5,
-            Value = 5,
+            ExtendedMaxValue = 11,
+            ReadCurrentFromDifficulty = diff => diff.CircleSize,
         };
 
-        [SettingSource("Approach Rate", "Override a beatmap's set AR.", LAST_SETTING_ORDER + 1)]
-        public BindableNumber<float> ApproachRate { get; } = new BindableFloatWithLimitExtension
+        [SettingSource("Approach Rate", "Override a beatmap's set AR.", LAST_SETTING_ORDER + 1, SettingControlType = typeof(DifficultyAdjustSettingsControl))]
+        public DifficultyBindable ApproachRate { get; } = new DifficultyBindable
         {
             Precision = 0.1f,
             MinValue = 1,
             MaxValue = 10,
-            Default = 5,
-            Value = 5,
+            ExtendedMaxValue = 11,
+            ReadCurrentFromDifficulty = diff => diff.ApproachRate,
         };
 
         [SettingSource("Spicy Patterns", "Adjust the patterns as if Hard Rock is enabled.")]
         public BindableBool HardRockOffsets { get; } = new BindableBool();
 
-        protected override void ApplyLimits(bool extended)
-        {
-            base.ApplyLimits(extended);
-
-            CircleSize.MaxValue = extended ? 11 : 10;
-            ApproachRate.MaxValue = extended ? 11 : 10;
-        }
-
         public override string SettingDescription
         {
             get
@@ -61,20 +53,12 @@ namespace osu.Game.Rulesets.Catch.Mods
             }
         }
 
-        protected override void TransferSettings(BeatmapDifficulty difficulty)
-        {
-            base.TransferSettings(difficulty);
-
-            TransferSetting(CircleSize, difficulty.CircleSize);
-            TransferSetting(ApproachRate, difficulty.ApproachRate);
-        }
-
         protected override void ApplySettings(BeatmapDifficulty difficulty)
         {
             base.ApplySettings(difficulty);
 
-            ApplySetting(CircleSize, cs => difficulty.CircleSize = cs);
-            ApplySetting(ApproachRate, ar => difficulty.ApproachRate = ar);
+            if (CircleSize.Value != null) difficulty.CircleSize = CircleSize.Value.Value;
+            if (ApproachRate.Value != null) difficulty.ApproachRate = ApproachRate.Value.Value;
         }
 
         public void ApplyToBeatmapProcessor(IBeatmapProcessor beatmapProcessor)

osu.Game.Rulesets.Catch/Mods/CatchModFlashlight.cs

@@ -41,9 +41,7 @@ namespace osu.Game.Rulesets.Catch.Mods
             {
                 base.Update();
 
-                var catcherArea = playfield.CatcherArea;
-
-                FlashlightPosition = catcherArea.ToSpaceOfOtherDrawable(catcherArea.MovableCatcher.DrawPosition, this);
+                FlashlightPosition = playfield.CatcherArea.ToSpaceOfOtherDrawable(playfield.Catcher.DrawPosition, this);
             }
 
             private float getSizeFor(int combo)

osu.Game.Rulesets.Catch/Mods/CatchModHidden.cs

@@ -25,7 +25,7 @@ namespace osu.Game.Rulesets.Catch.Mods
             var drawableCatchRuleset = (DrawableCatchRuleset)drawableRuleset;
             var catchPlayfield = (CatchPlayfield)drawableCatchRuleset.Playfield;
 
-            catchPlayfield.CatcherArea.MovableCatcher.CatchFruitOnPlate = false;
+            catchPlayfield.Catcher.CatchFruitOnPlate = false;
         }
 
         protected override void ApplyIncreasedVisibilityState(DrawableHitObject hitObject, ArmedState state)

osu.Game.Rulesets.Catch/Mods/CatchModMuted.cs

@@ -0,0 +1,12 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Mods;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    public class CatchModMuted : ModMuted<CatchHitObject>
+    {
+    }
+}

osu.Game.Rulesets.Catch/Objects/Banana.cs

@@ -9,6 +9,7 @@ using osu.Game.Audio;
 using osu.Game.Rulesets.Catch.Judgements;
 using osu.Game.Rulesets.Judgements;
 using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Skinning;
 using osu.Game.Utils;
 using osuTK.Graphics;
 
@@ -31,7 +32,7 @@ namespace osu.Game.Rulesets.Catch.Objects
         }
 
         // override any external colour changes with banananana
-        Color4 IHasComboInformation.GetComboColour(IReadOnlyList<Color4> comboColours) => getBananaColour();
+        Color4 IHasComboInformation.GetComboColour(ISkin skin) => getBananaColour();
 
         private Color4 getBananaColour()
         {

osu.Game.Rulesets.Catch/Objects/CatchHitObject.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using Newtonsoft.Json;
 using osu.Framework.Bindables;
 using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.ControlPoints;
@@ -8,10 +9,11 @@ using osu.Game.Rulesets.Catch.UI;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Types;
 using osu.Game.Rulesets.Scoring;
+using osuTK;
 
 namespace osu.Game.Rulesets.Catch.Objects
 {
-    public abstract class CatchHitObject : HitObject, IHasXPosition, IHasComboInformation
+    public abstract class CatchHitObject : HitObject, IHasPosition, IHasComboInformation
     {
         public const float OBJECT_RADIUS = 64;
 
@@ -20,13 +22,16 @@ namespace osu.Game.Rulesets.Catch.Objects
         /// <summary>
         /// The horizontal position of the hit object between 0 and <see cref="CatchPlayfield.WIDTH"/>.
         /// </summary>
+        /// <remarks>
+        /// Only setter is exposed.
+        /// Use <see cref="OriginalX"/> or <see cref="EffectiveX"/> to get the horizontal position.
+        /// </remarks>
+        [JsonIgnore]
         public float X
         {
             set => OriginalXBindable.Value = value;
         }
 
-        float IHasXPosition.X => OriginalXBindable.Value;
-
         public readonly Bindable<float> XOffsetBindable = new Bindable<float>();
 
         /// <summary>
@@ -34,6 +39,7 @@ namespace osu.Game.Rulesets.Catch.Objects
         /// </summary>
         public float XOffset
         {
+            get => XOffsetBindable.Value;
             set => XOffsetBindable.Value = value;
         }
 
@@ -44,7 +50,11 @@ namespace osu.Game.Rulesets.Catch.Objects
         /// This value is the original <see cref="X"/> value specified in the beatmap, not affected by the beatmap processing.
         /// Use <see cref="EffectiveX"/> for a gameplay.
         /// </remarks>
-        public float OriginalX => OriginalXBindable.Value;
+        public float OriginalX
+        {
+            get => OriginalXBindable.Value;
+            set => OriginalXBindable.Value = value;
+        }
 
         /// <summary>
         /// The effective horizontal position of the hit object between 0 and <see cref="CatchPlayfield.WIDTH"/>.
@@ -53,9 +63,9 @@ namespace osu.Game.Rulesets.Catch.Objects
         /// This value is the original <see cref="X"/> value plus the offset applied by the beatmap processing.
         /// Use <see cref="OriginalX"/> if a value not affected by the offset is desired.
         /// </remarks>
-        public float EffectiveX => OriginalXBindable.Value + XOffsetBindable.Value;
+        public float EffectiveX => OriginalX + XOffset;
 
-        public double TimePreempt = 1000;
+        public double TimePreempt { get; set; } = 1000;
 
         public readonly Bindable<int> IndexInBeatmapBindable = new Bindable<int>();
 
@@ -85,6 +95,14 @@ namespace osu.Game.Rulesets.Catch.Objects
             set => ComboIndexBindable.Value = value;
         }
 
+        public Bindable<int> ComboIndexWithOffsetsBindable { get; } = new Bindable<int>();
+
+        public int ComboIndexWithOffsets
+        {
+            get => ComboIndexWithOffsetsBindable.Value;
+            set => ComboIndexWithOffsetsBindable.Value = value;
+        }
+
         public Bindable<bool> LastInComboBindable { get; } = new Bindable<bool>();
 
         /// <summary>
@@ -120,5 +138,24 @@ namespace osu.Game.Rulesets.Catch.Objects
         }
 
         protected override HitWindows CreateHitWindows() => HitWindows.Empty;
+
+        #region Hit object conversion
+
+        // The half of the height of the osu! playfield.
+        public const float DEFAULT_LEGACY_CONVERT_Y = 192;
+
+        /// <summary>
+        /// The Y position of the hit object is not used in the normal osu!catch gameplay.
+        /// It is preserved to maximize the backward compatibility with the legacy editor, in which the mappers use the Y position to organize the patterns.
+        /// </summary>
+        public float LegacyConvertedY { get; set; } = DEFAULT_LEGACY_CONVERT_Y;
+
+        float IHasXPosition.X => OriginalX;
+
+        float IHasYPosition.Y => LegacyConvertedY;
+
+        Vector2 IHasPosition.Position => new Vector2(OriginalX, LegacyConvertedY);
+
+        #endregion
     }
 }

osu.Game.Rulesets.Catch/Objects/JuiceStream.cs

@@ -5,6 +5,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
+using Newtonsoft.Json;
 using osu.Game.Audio;
 using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.ControlPoints;
@@ -25,7 +26,10 @@ namespace osu.Game.Rulesets.Catch.Objects
 
         public int RepeatCount { get; set; }
 
+        [JsonIgnore]
         public double Velocity { get; private set; }
+
+        [JsonIgnore]
         public double TickDistance { get; private set; }
 
         /// <summary>
@@ -113,6 +117,7 @@ namespace osu.Game.Rulesets.Catch.Objects
 
         public float EndX => OriginalX + this.CurvePositionAt(1).X;
 
+        [JsonIgnore]
         public double Duration
         {
             get => this.SpanCount() * Path.Distance / Velocity;

osu.Game.Rulesets.Catch/Objects/JuiceStreamPath.cs

@@ -0,0 +1,340 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osuTK;
+
+#nullable enable
+
+namespace osu.Game.Rulesets.Catch.Objects
+{
+    /// <summary>
+    /// Represents the path of a juice stream.
+    /// <para>
+    /// A <see cref="JuiceStream"/> holds a legacy <see cref="SliderPath"/> as the representation of the path.
+    /// However, the <see cref="SliderPath"/> representation is difficult to work with.
+    /// This <see cref="JuiceStreamPath"/> represents the path in a more convenient way, a polyline connecting list of <see cref="JuiceStreamPathVertex"/>s.
+    /// </para>
+    /// <para>
+    /// The path can be regarded as a function from the closed interval <c>[Vertices[0].Distance, Vertices[^1].Distance]</c> to the x position, given by <see cref="PositionAtDistance"/>.
+    /// To ensure the path is convertible to a <see cref="SliderPath"/>, the slope of the function must not be more than <c>1</c> everywhere,
+    /// and this slope condition is always maintained as an invariant.
+    /// </para>
+    /// </summary>
+    public class JuiceStreamPath
+    {
+        /// <summary>
+        /// The height of legacy osu!standard playfield.
+        /// The sliders converted by <see cref="ConvertToSliderPath"/> are vertically contained in this height.
+        /// </summary>
+        internal const float OSU_PLAYFIELD_HEIGHT = 384;
+
+        /// <summary>
+        /// The list of vertices of the path, which is represented as a polyline connecting the vertices.
+        /// </summary>
+        public IReadOnlyList<JuiceStreamPathVertex> Vertices => vertices;
+
+        /// <summary>
+        /// The current version number.
+        /// This starts from <c>1</c> and incremented whenever this <see cref="JuiceStreamPath"/> is modified.
+        /// </summary>
+        public int InvalidationID { get; private set; } = 1;
+
+        /// <summary>
+        /// The difference between first vertex's <see cref="JuiceStreamPathVertex.Distance"/> and last vertex's <see cref="JuiceStreamPathVertex.Distance"/>.
+        /// </summary>
+        public double Distance => vertices[^1].Distance - vertices[0].Distance;
+
+        /// <remarks>
+        /// This list should always be non-empty.
+        /// </remarks>
+        private readonly List<JuiceStreamPathVertex> vertices = new List<JuiceStreamPathVertex>
+        {
+            new JuiceStreamPathVertex()
+        };
+
+        /// <summary>
+        /// Compute the x-position of the path at the given <paramref name="distance"/>.
+        /// </summary>
+        /// <remarks>
+        /// When the given distance is outside of the path, the x position at the corresponding endpoint is returned,
+        /// </remarks>
+        public float PositionAtDistance(double distance)
+        {
+            int index = vertexIndexAtDistance(distance);
+            return positionAtDistance(distance, index);
+        }
+
+        /// <summary>
+        /// Remove all vertices of this path, then add a new vertex <c>(0, 0)</c>.
+        /// </summary>
+        public void Clear()
+        {
+            vertices.Clear();
+            vertices.Add(new JuiceStreamPathVertex());
+            invalidate();
+        }
+
+        /// <summary>
+        /// Insert a vertex at given <paramref name="distance"/>.
+        /// The <see cref="PositionAtDistance"/> is used as the position of the new vertex.
+        /// Thus, the set of points of the path is not changed (up to floating-point precision).
+        /// </summary>
+        /// <returns>The index of the new vertex.</returns>
+        public int InsertVertex(double distance)
+        {
+            if (!double.IsFinite(distance))
+                throw new ArgumentOutOfRangeException(nameof(distance));
+
+            int index = vertexIndexAtDistance(distance);
+            float x = positionAtDistance(distance, index);
+            vertices.Insert(index, new JuiceStreamPathVertex(distance, x));
+
+            invalidate();
+            return index;
+        }
+
+        /// <summary>
+        /// Move the vertex of given <paramref name="index"/> to the given position <paramref name="newX"/>.
+        /// When the distances between vertices are too small for the new vertex positions, the adjacent vertices are moved towards <paramref name="newX"/>.
+        /// </summary>
+        public void SetVertexPosition(int index, float newX)
+        {
+            if (index < 0 || index >= vertices.Count)
+                throw new ArgumentOutOfRangeException(nameof(index));
+
+            if (!float.IsFinite(newX))
+                throw new ArgumentOutOfRangeException(nameof(newX));
+
+            var newVertex = new JuiceStreamPathVertex(vertices[index].Distance, newX);
+
+            for (int i = index - 1; i >= 0 && !canConnect(vertices[i], newVertex); i--)
+            {
+                float clampedX = clampToConnectablePosition(newVertex, vertices[i]);
+                vertices[i] = new JuiceStreamPathVertex(vertices[i].Distance, clampedX);
+            }
+
+            for (int i = index + 1; i < vertices.Count; i++)
+            {
+                float clampedX = clampToConnectablePosition(newVertex, vertices[i]);
+                vertices[i] = new JuiceStreamPathVertex(vertices[i].Distance, clampedX);
+            }
+
+            vertices[index] = newVertex;
+
+            invalidate();
+        }
+
+        /// <summary>
+        /// Add a new vertex at given <paramref name="distance"/> and position.
+        /// Adjacent vertices are moved when necessary in the same way as <see cref="SetVertexPosition"/>.
+        /// </summary>
+        public void Add(double distance, float x)
+        {
+            int index = InsertVertex(distance);
+            SetVertexPosition(index, x);
+        }
+
+        /// <summary>
+        /// Remove all vertices that satisfy the given <paramref name="predicate"/>.
+        /// </summary>
+        /// <remarks>
+        /// If all vertices are removed, a new vertex <c>(0, 0)</c> is added.
+        /// </remarks>
+        /// <param name="predicate">The predicate to determine whether a vertex should be removed given the vertex and its index in the path.</param>
+        /// <returns>The number of removed vertices.</returns>
+        public int RemoveVertices(Func<JuiceStreamPathVertex, int, bool> predicate)
+        {
+            int index = 0;
+            int removeCount = vertices.RemoveAll(vertex => predicate(vertex, index++));
+
+            if (vertices.Count == 0)
+                vertices.Add(new JuiceStreamPathVertex());
+
+            if (removeCount != 0)
+                invalidate();
+
+            return removeCount;
+        }
+
+        /// <summary>
+        /// Recreate this path by using difference set of vertices at given distances.
+        /// In addition to the given <paramref name="sampleDistances"/>, the first vertex and the last vertex are always added to the new path.
+        /// New vertices use the positions on the original path. Thus, <see cref="PositionAtDistance"/>s at <paramref name="sampleDistances"/> are preserved.
+        /// </summary>
+        public void ResampleVertices(IEnumerable<double> sampleDistances)
+        {
+            var sampledVertices = new List<JuiceStreamPathVertex>();
+
+            foreach (double distance in sampleDistances)
+            {
+                if (!double.IsFinite(distance))
+                    throw new ArgumentOutOfRangeException(nameof(sampleDistances));
+
+                double clampedDistance = Math.Clamp(distance, vertices[0].Distance, vertices[^1].Distance);
+                float x = PositionAtDistance(clampedDistance);
+                sampledVertices.Add(new JuiceStreamPathVertex(clampedDistance, x));
+            }
+
+            sampledVertices.Sort();
+
+            // The first vertex and the last vertex are always used in the result.
+            vertices.RemoveRange(1, vertices.Count - (vertices.Count == 1 ? 1 : 2));
+            vertices.InsertRange(1, sampledVertices);
+
+            invalidate();
+        }
+
+        /// <summary>
+        /// Convert a <see cref="SliderPath"/> to list of vertices and write the result to this <see cref="JuiceStreamPath"/>.
+        /// </summary>
+        /// <remarks>
+        /// Duplicated vertices are automatically removed.
+        /// </remarks>
+        public void ConvertFromSliderPath(SliderPath sliderPath)
+        {
+            var sliderPathVertices = new List<Vector2>();
+            sliderPath.GetPathToProgress(sliderPathVertices, 0, 1);
+
+            double distance = 0;
+
+            vertices.Clear();
+            vertices.Add(new JuiceStreamPathVertex(0, sliderPathVertices.FirstOrDefault().X));
+
+            for (int i = 1; i < sliderPathVertices.Count; i++)
+            {
+                distance += Vector2.Distance(sliderPathVertices[i - 1], sliderPathVertices[i]);
+
+                if (!Precision.AlmostEquals(vertices[^1].Distance, distance))
+                    vertices.Add(new JuiceStreamPathVertex(distance, sliderPathVertices[i].X));
+            }
+
+            invalidate();
+        }
+
+        /// <summary>
+        /// Convert the path of this <see cref="JuiceStreamPath"/> to a <see cref="SliderPath"/> and write the result to <paramref name="sliderPath"/>.
+        /// The resulting slider is "folded" to make it vertically contained in the playfield `(0..<see cref="OSU_PLAYFIELD_HEIGHT"/>)` assuming the slider start position is <paramref name="sliderStartY"/>.
+        /// </summary>
+        public void ConvertToSliderPath(SliderPath sliderPath, float sliderStartY)
+        {
+            const float margin = 1;
+
+            // Note: these two variables and `sliderPath` are modified by the local functions.
+            double currentDistance = 0;
+            Vector2 lastPosition = new Vector2(vertices[0].X, 0);
+
+            sliderPath.ControlPoints.Clear();
+            sliderPath.ControlPoints.Add(new PathControlPoint(lastPosition));
+
+            for (int i = 1; i < vertices.Count; i++)
+            {
+                sliderPath.ControlPoints[^1].Type.Value = PathType.Linear;
+
+                float deltaX = vertices[i].X - lastPosition.X;
+                double length = vertices[i].Distance - currentDistance;
+
+                // Should satisfy `deltaX^2 + deltaY^2 = length^2`.
+                // By invariants, the expression inside the `sqrt` is (almost) non-negative.
+                double deltaY = Math.Sqrt(Math.Max(0, length * length - (double)deltaX * deltaX));
+
+                // When `deltaY` is small, one segment is always enough.
+                // This case is handled separately to prevent divide-by-zero.
+                if (deltaY <= OSU_PLAYFIELD_HEIGHT / 2 - margin)
+                {
+                    float nextX = vertices[i].X;
+                    float nextY = (float)(lastPosition.Y + getYDirection() * deltaY);
+                    addControlPoint(nextX, nextY);
+                    continue;
+                }
+
+                // When `deltaY` is large or when the slider velocity is fast, the segment must be partitioned to subsegments to stay in bounds.
+                for (double currentProgress = 0; currentProgress < deltaY;)
+                {
+                    double nextProgress = Math.Min(currentProgress + getMaxDeltaY(), deltaY);
+                    float nextX = (float)(vertices[i - 1].X + nextProgress / deltaY * deltaX);
+                    float nextY = (float)(lastPosition.Y + getYDirection() * (nextProgress - currentProgress));
+                    addControlPoint(nextX, nextY);
+                    currentProgress = nextProgress;
+                }
+            }
+
+            int getYDirection()
+            {
+                float lastSliderY = sliderStartY + lastPosition.Y;
+                return lastSliderY < OSU_PLAYFIELD_HEIGHT / 2 ? 1 : -1;
+            }
+
+            float getMaxDeltaY()
+            {
+                float lastSliderY = sliderStartY + lastPosition.Y;
+                return Math.Max(lastSliderY, OSU_PLAYFIELD_HEIGHT - lastSliderY) - margin;
+            }
+
+            void addControlPoint(float nextX, float nextY)
+            {
+                Vector2 nextPosition = new Vector2(nextX, nextY);
+                sliderPath.ControlPoints.Add(new PathControlPoint(nextPosition));
+                currentDistance += Vector2.Distance(lastPosition, nextPosition);
+                lastPosition = nextPosition;
+            }
+        }
+
+        /// <summary>
+        /// Find the index at which a new vertex with <paramref name="distance"/> can be inserted.
+        /// </summary>
+        private int vertexIndexAtDistance(double distance)
+        {
+            // The position of `(distance, Infinity)` is uniquely determined because infinite positions are not allowed.
+            int i = vertices.BinarySearch(new JuiceStreamPathVertex(distance, float.PositiveInfinity));
+            return i < 0 ? ~i : i;
+        }
+
+        /// <summary>
+        /// Compute the position at the given <paramref name="distance"/>, assuming <paramref name="index"/> is the vertex index returned by <see cref="vertexIndexAtDistance"/>.
+        /// </summary>
+        private float positionAtDistance(double distance, int index)
+        {
+            if (index <= 0)
+                return vertices[0].X;
+            if (index >= vertices.Count)
+                return vertices[^1].X;
+
+            double length = vertices[index].Distance - vertices[index - 1].Distance;
+            if (Precision.AlmostEquals(length, 0))
+                return vertices[index].X;
+
+            float deltaX = vertices[index].X - vertices[index - 1].X;
+
+            return (float)(vertices[index - 1].X + deltaX * ((distance - vertices[index - 1].Distance) / length));
+        }
+
+        /// <summary>
+        /// Check the two vertices can connected directly while satisfying the slope condition.
+        /// </summary>
+        private bool canConnect(JuiceStreamPathVertex vertex1, JuiceStreamPathVertex vertex2, float allowance = 0)
+        {
+            double xDistance = Math.Abs((double)vertex2.X - vertex1.X);
+            float length = (float)Math.Abs(vertex2.Distance - vertex1.Distance);
+            return xDistance <= length + allowance;
+        }
+
+        /// <summary>
+        /// Move the position of <paramref name="movableVertex"/> towards the position of <paramref name="fixedVertex"/>
+        /// until the vertex pair satisfies the condition <see cref="canConnect"/>.
+        /// </summary>
+        /// <returns>The resulting position of <paramref name="movableVertex"/>.</returns>
+        private float clampToConnectablePosition(JuiceStreamPathVertex fixedVertex, JuiceStreamPathVertex movableVertex)
+        {
+            float length = (float)Math.Abs(movableVertex.Distance - fixedVertex.Distance);
+            return Math.Clamp(movableVertex.X, fixedVertex.X - length, fixedVertex.X + length);
+        }
+
+        private void invalidate() => InvalidationID++;
+    }
+}

osu.Game.Rulesets.Catch/Objects/JuiceStreamPathVertex.cs

@@ -0,0 +1,33 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+
+#nullable enable
+
+namespace osu.Game.Rulesets.Catch.Objects
+{
+    /// <summary>
+    /// A vertex of a <see cref="JuiceStreamPath"/>.
+    /// </summary>
+    public readonly struct JuiceStreamPathVertex : IComparable<JuiceStreamPathVertex>
+    {
+        public readonly double Distance;
+
+        public readonly float X;
+
+        public JuiceStreamPathVertex(double distance, float x)
+        {
+            Distance = distance;
+            X = x;
+        }
+
+        public int CompareTo(JuiceStreamPathVertex other)
+        {
+            int c = Distance.CompareTo(other.Distance);
+            return c != 0 ? c : X.CompareTo(other.X);
+        }
+
+        public override string ToString() => $"({Distance}, {X})";
+    }
+}

osu.Game.Rulesets.Catch/Objects/PalpableCatchHitObject.cs

@@ -1,9 +1,10 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System.Collections.Generic;
+using Newtonsoft.Json;
 using osu.Framework.Bindables;
 using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Skinning;
 using osuTK.Graphics;
 
 namespace osu.Game.Rulesets.Catch.Objects
@@ -33,6 +34,7 @@ namespace osu.Game.Rulesets.Catch.Objects
         /// <summary>
         /// The target fruit if we are to initiate a hyperdash.
         /// </summary>
+        [JsonIgnore]
         public CatchHitObject HyperDashTarget
         {
             get => hyperDashTarget;
@@ -43,6 +45,6 @@ namespace osu.Game.Rulesets.Catch.Objects
             }
         }
 
-        Color4 IHasComboInformation.GetComboColour(IReadOnlyList<Color4> comboColours) => comboColours[(IndexInBeatmap + 1) % comboColours.Count];
+        Color4 IHasComboInformation.GetComboColour(ISkin skin) => IHasComboInformation.GetSkinComboColour(this, skin, IndexInBeatmap + 1);
     }
 }

osu.Game.Rulesets.Catch/Replays/CatchAutoGenerator.cs

@@ -51,7 +51,7 @@ namespace osu.Game.Rulesets.Catch.Replays
                 bool impossibleJump = speedRequired > movement_speed * 2;
 
                 // todo: get correct catcher size, based on difficulty CS.
-                const float catcher_width_half = CatcherArea.CATCHER_SIZE * 0.3f * 0.5f;
+                const float catcher_width_half = Catcher.BASE_SIZE * 0.3f * 0.5f;
 
                 if (lastPosition - catcher_width_half < h.EffectiveX && lastPosition + catcher_width_half > h.EffectiveX)
                 {

osu.Game.Rulesets.Catch/Skinning/CatchSkinConfiguration.cs

@@ -0,0 +1,13 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Rulesets.Catch.Skinning
+{
+    public enum CatchSkinConfiguration
+    {
+        /// <summary>
+        /// Whether the contents of the catcher plate should be visually flipped when the catcher direction is changed.
+        /// </summary>
+        FlipCatcherPlate
+    }
+}

osu.Game.Rulesets.Catch/Skinning/Legacy/CatchLegacySkinTransformer.cs

@@ -103,6 +103,19 @@ namespace osu.Game.Rulesets.Catch.Skinning.Legacy
 
                     result.Value = LegacyColourCompatibility.DisallowZeroAlpha(result.Value);
                     return (IBindable<TValue>)result;
+
+                case CatchSkinConfiguration config:
+                    switch (config)
+                    {
+                        case CatchSkinConfiguration.FlipCatcherPlate:
+                            // Don't flip catcher plate contents if the catcher is provided by this legacy skin.
+                            if (GetDrawableComponent(new CatchSkinComponent(CatchSkinComponents.Catcher)) != null)
+                                return (IBindable<TValue>)new Bindable<bool>();
+
+                            break;
+                    }
+
+                    break;
             }
 
             return base.GetConfig<TLookup, TValue>(lookup);

osu.Game.Rulesets.Catch/UI/CatchPlayfield.cs

@@ -26,38 +26,47 @@ namespace osu.Game.Rulesets.Catch.UI
         /// </summary>
         public const float CENTER_X = WIDTH / 2;
 
-        [Cached]
-        private readonly DroppedObjectContainer droppedObjectContainer;
-
-        internal readonly CatcherArea CatcherArea;
-
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
             // only check the X position; handle all vertical space.
             base.ReceivePositionalInputAt(new Vector2(screenSpacePos.X, ScreenSpaceDrawQuad.Centre.Y));
 
+        internal Catcher Catcher { get; private set; }
+
+        internal CatcherArea CatcherArea { get; private set; }
+
+        private readonly BeatmapDifficulty difficulty;
+
         public CatchPlayfield(BeatmapDifficulty difficulty)
         {
-            CatcherArea = new CatcherArea(difficulty)
-            {
-                Anchor = Anchor.BottomLeft,
-                Origin = Anchor.TopLeft,
-            };
-
-            InternalChildren = new[]
-            {
-                droppedObjectContainer = new DroppedObjectContainer(),
-                CatcherArea.MovableCatcher.CreateProxiedContent(),
-                HitObjectContainer.CreateProxy(),
-                // This ordering (`CatcherArea` before `HitObjectContainer`) is important to
-                // make sure the up-to-date catcher position is used for the catcher catching logic of hit objects.
-                CatcherArea,
-                HitObjectContainer,
-            };
+            this.difficulty = difficulty;
         }
 
         [BackgroundDependencyLoader]
         private void load()
         {
+            var droppedObjectContainer = new DroppedObjectContainer();
+
+            Catcher = new Catcher(droppedObjectContainer, difficulty)
+            {
+                X = CENTER_X
+            };
+
+            AddRangeInternal(new[]
+            {
+                droppedObjectContainer,
+                Catcher.CreateProxiedContent(),
+                HitObjectContainer.CreateProxy(),
+                // This ordering (`CatcherArea` before `HitObjectContainer`) is important to
+                // make sure the up-to-date catcher position is used for the catcher catching logic of hit objects.
+                CatcherArea = new CatcherArea
+                {
+                    Anchor = Anchor.BottomLeft,
+                    Origin = Anchor.TopLeft,
+                    Catcher = Catcher,
+                },
+                HitObjectContainer,
+            });
+
             RegisterPool<Droplet, DrawableDroplet>(50);
             RegisterPool<TinyDroplet, DrawableTinyDroplet>(50);
             RegisterPool<Fruit, DrawableFruit>(100);
@@ -80,7 +89,7 @@ namespace osu.Game.Rulesets.Catch.UI
             ((DrawableCatchHitObject)d).CheckPosition = checkIfWeCanCatch;
         }
 
-        private bool checkIfWeCanCatch(CatchHitObject obj) => CatcherArea.MovableCatcher.CanCatch(obj);
+        private bool checkIfWeCanCatch(CatchHitObject obj) => Catcher.CanCatch(obj);
 
         private void onNewResult(DrawableHitObject judgedObject, JudgementResult result)
             => CatcherArea.OnNewResult((DrawableCatchHitObject)judgedObject, result);

osu.Game.Rulesets.Catch/UI/CatchReplayRecorder.cs

@@ -21,6 +21,6 @@ namespace osu.Game.Rulesets.Catch.UI
         }
 
         protected override ReplayFrame HandleFrame(Vector2 mousePosition, List<CatchAction> actions, ReplayFrame previousFrame)
-            => new CatchReplayFrame(Time.Current, playfield.CatcherArea.MovableCatcher.X, actions.Contains(CatchAction.Dash), previousFrame as CatchReplayFrame);
+            => new CatchReplayFrame(Time.Current, playfield.Catcher.X, actions.Contains(CatchAction.Dash), previousFrame as CatchReplayFrame);
     }
 }

osu.Game.Rulesets.Catch/UI/Catcher.cs

@@ -26,8 +26,17 @@ namespace osu.Game.Rulesets.Catch.UI
     public class Catcher : SkinReloadableDrawable
     {
         /// <summary>
-        /// The default colour used to tint hyper-dash fruit, along with the moving catcher, its trail
-        /// and end glow/after-image during a hyper-dash.
+        /// The size of the catcher at 1x scale.
+        /// </summary>
+        public const float BASE_SIZE = 106.75f;
+
+        /// <summary>
+        /// The width of the catcher which can receive fruit. Equivalent to "catchMargin" in osu-stable.
+        /// </summary>
+        public const float ALLOWED_CATCH_RANGE = 0.8f;
+
+        /// <summary>
+        /// The default colour used to tint hyper-dash fruit, along with the moving catcher, its trail and after-image during a hyper-dash.
         /// </summary>
         public static readonly Color4 DEFAULT_HYPER_DASH_COLOUR = Color4.Red;
 
@@ -56,21 +65,11 @@ namespace osu.Game.Rulesets.Catch.UI
         /// </summary>
         public double Speed => (Dashing ? 1 : 0.5) * BASE_SPEED * hyperDashModifier;
 
-        /// <summary>
-        /// The amount by which caught fruit should be offset from the plate surface to make them look visually "caught".
-        /// </summary>
-        public const float CAUGHT_FRUIT_VERTICAL_OFFSET = -5;
-
         /// <summary>
         /// The amount by which caught fruit should be scaled down to fit on the plate.
         /// </summary>
         private const float caught_fruit_scale_adjust = 0.5f;
 
-        [NotNull]
-        private readonly Container trailsTarget;
-
-        private CatcherTrailDisplay trails;
-
         /// <summary>
         /// Contains caught objects on the plate.
         /// </summary>
@@ -79,8 +78,7 @@ namespace osu.Game.Rulesets.Catch.UI
         /// <summary>
         /// Contains objects dropped from the plate.
         /// </summary>
-        [Resolved]
-        private DroppedObjectContainer droppedObjectTarget { get; set; }
+        private readonly DroppedObjectContainer droppedObjectTarget;
 
         public CatcherAnimationState CurrentState
         {
@@ -89,30 +87,21 @@ namespace osu.Game.Rulesets.Catch.UI
         }
 
         /// <summary>
-        /// The width of the catcher which can receive fruit. Equivalent to "catchMargin" in osu-stable.
+        /// Whether the catcher is currently dashing.
         /// </summary>
-        public const float ALLOWED_CATCH_RANGE = 0.8f;
+        public bool Dashing { get; set; }
 
-        private bool dashing;
+        /// <summary>
+        /// The currently facing direction.
+        /// </summary>
+        public Direction VisualDirection { get; set; } = Direction.Right;
 
-        public bool Dashing
-        {
-            get => dashing;
-            set
-            {
-                if (value == dashing) return;
+        public Vector2 BodyScale => Scale * body.Scale;
 
-                dashing = value;
-
-                updateTrailVisibility();
-            }
-        }
-
-        public Direction VisualDirection
-        {
-            get => Scale.X > 0 ? Direction.Right : Direction.Left;
-            set => Scale = new Vector2((value == Direction.Right ? 1 : -1) * Math.Abs(Scale.X), Scale.Y);
-        }
+        /// <summary>
+        /// Whether the contents of the catcher plate should be visually flipped when the catcher direction is changed.
+        /// </summary>
+        private bool flipCatcherPlate;
 
         /// <summary>
         /// Width of the area that can be used to attempt catches during gameplay.
@@ -122,7 +111,6 @@ namespace osu.Game.Rulesets.Catch.UI
         private readonly SkinnableCatcher body;
 
         private Color4 hyperDashColour = DEFAULT_HYPER_DASH_COLOUR;
-        private Color4 hyperDashEndGlowColour = DEFAULT_HYPER_DASH_COLOUR;
 
         private double hyperDashModifier = 1;
         private int hyperDashDirection;
@@ -135,13 +123,13 @@ namespace osu.Game.Rulesets.Catch.UI
         private readonly DrawablePool<CaughtBanana> caughtBananaPool;
         private readonly DrawablePool<CaughtDroplet> caughtDropletPool;
 
-        public Catcher([NotNull] Container trailsTarget, BeatmapDifficulty difficulty = null)
+        public Catcher([NotNull] DroppedObjectContainer droppedObjectTarget, BeatmapDifficulty difficulty = null)
         {
-            this.trailsTarget = trailsTarget;
+            this.droppedObjectTarget = droppedObjectTarget;
 
             Origin = Anchor.TopCentre;
 
-            Size = new Vector2(CatcherArea.CATCHER_SIZE);
+            Size = new Vector2(BASE_SIZE);
             if (difficulty != null)
                 Scale = calculateScale(difficulty);
 
@@ -157,6 +145,8 @@ namespace osu.Game.Rulesets.Catch.UI
                 {
                     Anchor = Anchor.TopCentre,
                     Origin = Anchor.BottomCentre,
+                    // offset fruit vertically to better place "above" the plate.
+                    Y = -5
                 },
                 body = new SkinnableCatcher(),
                 hitExplosionContainer = new HitExplosionContainer
@@ -171,15 +161,6 @@ namespace osu.Game.Rulesets.Catch.UI
         private void load(OsuConfigManager config)
         {
             hitLighting = config.GetBindable<bool>(OsuSetting.HitLighting);
-            trails = new CatcherTrailDisplay(this);
-        }
-
-        protected override void LoadComplete()
-        {
-            base.LoadComplete();
-
-            // don't add in above load as we may potentially modify a parent in an unsafe manner.
-            trailsTarget.Add(trails);
         }
 
         /// <summary>
@@ -196,7 +177,7 @@ namespace osu.Game.Rulesets.Catch.UI
         /// Calculates the width of the area used for attempting catches in gameplay.
         /// </summary>
         /// <param name="scale">The scale of the catcher.</param>
-        public static float CalculateCatchWidth(Vector2 scale) => CatcherArea.CATCHER_SIZE * Math.Abs(scale.X) * ALLOWED_CATCH_RANGE;
+        public static float CalculateCatchWidth(Vector2 scale) => BASE_SIZE * Math.Abs(scale.X) * ALLOWED_CATCH_RANGE;
 
         /// <summary>
         /// Calculates the width of the area used for attempting catches in gameplay.
@@ -212,14 +193,9 @@ namespace osu.Game.Rulesets.Catch.UI
             if (!(hitObject is PalpableCatchHitObject fruit))
                 return false;
 
-            var halfCatchWidth = catchWidth * 0.5f;
-
-            // this stuff wil disappear once we move fruit to non-relative coordinate space in the future.
-            var catchObjectPosition = fruit.EffectiveX;
-            var catcherPosition = Position.X;
-
-            return catchObjectPosition >= catcherPosition - halfCatchWidth &&
-                   catchObjectPosition <= catcherPosition + halfCatchWidth;
+            float halfCatchWidth = catchWidth * 0.5f;
+            return fruit.EffectiveX >= X - halfCatchWidth &&
+                   fruit.EffectiveX <= X + halfCatchWidth;
         }
 
         public void OnNewResult(DrawableCatchHitObject drawableObject, JudgementResult result)
@@ -306,10 +282,7 @@ namespace osu.Game.Rulesets.Catch.UI
                 hyperDashTargetPosition = targetPosition;
 
                 if (!wasHyperDashing)
-                {
-                    trails.DisplayEndGlow();
                     runHyperDashStateTransition(true);
-                }
             }
         }
 
@@ -325,13 +298,9 @@ namespace osu.Game.Rulesets.Catch.UI
 
         private void runHyperDashStateTransition(bool hyperDashing)
         {
-            updateTrailVisibility();
-
             this.FadeColour(hyperDashing ? hyperDashColour : Color4.White, HYPER_DASH_TRANSITION_DURATION, Easing.OutQuint);
         }
 
-        private void updateTrailVisibility() => trails.DisplayTrail = Dashing || HyperDashing;
-
         protected override void SkinChanged(ISkinSource skin)
         {
             base.SkinChanged(skin);
@@ -340,12 +309,7 @@ namespace osu.Game.Rulesets.Catch.UI
                 skin.GetConfig<CatchSkinColour, Color4>(CatchSkinColour.HyperDash)?.Value ??
                 DEFAULT_HYPER_DASH_COLOUR;
 
-            hyperDashEndGlowColour =
-                skin.GetConfig<CatchSkinColour, Color4>(CatchSkinColour.HyperDashAfterImage)?.Value ??
-                hyperDashColour;
-
-            trails.HyperDashTrailsColour = hyperDashColour;
-            trails.EndGlowSpritesColour = hyperDashEndGlowColour;
+            flipCatcherPlate = skin.GetConfig<CatchSkinConfiguration, bool>(CatchSkinConfiguration.FlipCatcherPlate)?.Value ?? true;
 
             runHyperDashStateTransition(HyperDashing);
         }
@@ -354,6 +318,10 @@ namespace osu.Game.Rulesets.Catch.UI
         {
             base.Update();
 
+            var scaleFromDirection = new Vector2((int)VisualDirection, 1);
+            body.Scale = scaleFromDirection;
+            caughtObjectContainer.Scale = hitExplosionContainer.Scale = flipCatcherPlate ? scaleFromDirection : Vector2.One;
+
             // Correct overshooting.
             if ((hyperDashDirection > 0 && hyperDashTargetPosition < X) ||
                 (hyperDashDirection < 0 && hyperDashTargetPosition > X))
@@ -388,9 +356,6 @@ namespace osu.Game.Rulesets.Catch.UI
             float adjustedRadius = displayRadius * lenience_adjust;
             float checkDistance = MathF.Pow(adjustedRadius, 2);
 
-            // offset fruit vertically to better place "above" the plate.
-            position.Y += CAUGHT_FRUIT_VERTICAL_OFFSET;
-
             while (caughtObjectContainer.Any(f => Vector2Extensions.DistanceSquared(f.Position, position) < checkDistance))
             {
                 position.X += RNG.NextSingle(-adjustedRadius, adjustedRadius);
@@ -465,7 +430,7 @@ namespace osu.Game.Rulesets.Catch.UI
                     break;
 
                 case DroppedObjectAnimation.Explode:
-                    var originalX = droppedObjectTarget.ToSpaceOfOtherDrawable(d.DrawPosition, caughtObjectContainer).X * Scale.X;
+                    float originalX = droppedObjectTarget.ToSpaceOfOtherDrawable(d.DrawPosition, caughtObjectContainer).X * caughtObjectContainer.Scale.X;
                     d.MoveToY(d.Y - 50, 250, Easing.OutSine).Then().MoveToY(d.Y + 50, 500, Easing.InSine);
                     d.MoveToX(d.X + originalX * 6, 1000);
                     d.FadeOut(750);

osu.Game.Rulesets.Catch/UI/CatcherArea.cs

@@ -5,7 +5,6 @@ using System;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Input.Bindings;
-using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Catch.Judgements;
 using osu.Game.Rulesets.Catch.Objects.Drawables;
 using osu.Game.Rulesets.Catch.Replays;
@@ -16,13 +15,27 @@ using osuTK;
 
 namespace osu.Game.Rulesets.Catch.UI
 {
+    /// <summary>
+    /// The horizontal band at the bottom of the playfield the catcher is moving on.
+    /// It holds a <see cref="Catcher"/> as a child and translates input to the catcher movement.
+    /// It also holds a combo display that is above the catcher, and judgment results are translated to the catcher and the combo display.
+    /// </summary>
     public class CatcherArea : Container, IKeyBindingHandler<CatchAction>
     {
-        public const float CATCHER_SIZE = 106.75f;
+        public Catcher Catcher
+        {
+            get => catcher;
+            set => catcherContainer.Child = catcher = value;
+        }
+
+        private readonly Container<Catcher> catcherContainer;
 
-        public readonly Catcher MovableCatcher;
         private readonly CatchComboDisplay comboDisplay;
 
+        private readonly CatcherTrailDisplay catcherTrails;
+
+        private Catcher catcher;
+
         /// <summary>
         /// <c>-1</c> when only left button is pressed.
         /// <c>1</c> when only right button is pressed.
@@ -30,11 +43,19 @@ namespace osu.Game.Rulesets.Catch.UI
         /// </summary>
         private int currentDirection;
 
-        public CatcherArea(BeatmapDifficulty difficulty = null)
+        // TODO: support replay rewind
+        private bool lastHyperDashState;
+
+        /// <remarks>
+        /// <see cref="Catcher"/> must be set before loading.
+        /// </remarks>
+        public CatcherArea()
         {
-            Size = new Vector2(CatchPlayfield.WIDTH, CATCHER_SIZE);
+            Size = new Vector2(CatchPlayfield.WIDTH, Catcher.BASE_SIZE);
             Children = new Drawable[]
             {
+                catcherContainer = new Container<Catcher> { RelativeSizeAxes = Axes.Both },
+                catcherTrails = new CatcherTrailDisplay(),
                 comboDisplay = new CatchComboDisplay
                 {
                     RelativeSizeAxes = Axes.None,
@@ -43,14 +64,13 @@ namespace osu.Game.Rulesets.Catch.UI
                     Origin = Anchor.Centre,
                     Margin = new MarginPadding { Bottom = 350f },
                     X = CatchPlayfield.CENTER_X
-                },
-                MovableCatcher = new Catcher(this, difficulty) { X = CatchPlayfield.CENTER_X },
+                }
             };
         }
 
         public void OnNewResult(DrawableCatchHitObject hitObject, JudgementResult result)
         {
-            MovableCatcher.OnNewResult(hitObject, result);
+            Catcher.OnNewResult(hitObject, result);
 
             if (!result.Type.IsScorable())
                 return;
@@ -58,9 +78,9 @@ namespace osu.Game.Rulesets.Catch.UI
             if (hitObject.HitObject.LastInCombo)
             {
                 if (result.Judgement is CatchJudgement catchJudgement && catchJudgement.ShouldExplodeFor(result))
-                    MovableCatcher.Explode();
+                    Catcher.Explode();
                 else
-                    MovableCatcher.Drop();
+                    Catcher.Drop();
             }
 
             comboDisplay.OnNewResult(hitObject, result);
@@ -69,7 +89,7 @@ namespace osu.Game.Rulesets.Catch.UI
         public void OnRevertResult(DrawableCatchHitObject hitObject, JudgementResult result)
         {
             comboDisplay.OnRevertResult(hitObject, result);
-            MovableCatcher.OnRevertResult(hitObject, result);
+            Catcher.OnRevertResult(hitObject, result);
         }
 
         protected override void Update()
@@ -80,27 +100,48 @@ namespace osu.Game.Rulesets.Catch.UI
 
             SetCatcherPosition(
                 replayState?.CatcherX ??
-                (float)(MovableCatcher.X + MovableCatcher.Speed * currentDirection * Clock.ElapsedFrameTime));
+                (float)(Catcher.X + Catcher.Speed * currentDirection * Clock.ElapsedFrameTime));
         }
 
         protected override void UpdateAfterChildren()
         {
             base.UpdateAfterChildren();
 
-            comboDisplay.X = MovableCatcher.X;
+            comboDisplay.X = Catcher.X;
+
+            if (Time.Elapsed <= 0)
+            {
+                // This is probably a wrong value, but currently the true value is not recorded.
+                // Setting `true` will prevent generation of false-positive after-images (with more false-negatives).
+                lastHyperDashState = true;
+                return;
+            }
+
+            if (!lastHyperDashState && Catcher.HyperDashing)
+                displayCatcherTrail(CatcherTrailAnimation.HyperDashAfterImage);
+
+            if (Catcher.Dashing || Catcher.HyperDashing)
+            {
+                double generationInterval = Catcher.HyperDashing ? 25 : 50;
+
+                if (Time.Current - catcherTrails.LastDashTrailTime >= generationInterval)
+                    displayCatcherTrail(Catcher.HyperDashing ? CatcherTrailAnimation.HyperDashing : CatcherTrailAnimation.Dashing);
+            }
+
+            lastHyperDashState = Catcher.HyperDashing;
         }
 
         public void SetCatcherPosition(float X)
         {
-            float lastPosition = MovableCatcher.X;
+            float lastPosition = Catcher.X;
             float newPosition = Math.Clamp(X, 0, CatchPlayfield.WIDTH);
 
-            MovableCatcher.X = newPosition;
+            Catcher.X = newPosition;
 
             if (lastPosition < newPosition)
-                MovableCatcher.VisualDirection = Direction.Right;
+                Catcher.VisualDirection = Direction.Right;
             else if (lastPosition > newPosition)
-                MovableCatcher.VisualDirection = Direction.Left;
+                Catcher.VisualDirection = Direction.Left;
         }
 
         public bool OnPressed(CatchAction action)
@@ -116,7 +157,7 @@ namespace osu.Game.Rulesets.Catch.UI
                     return true;
 
                 case CatchAction.Dash:
-                    MovableCatcher.Dashing = true;
+                    Catcher.Dashing = true;
                     return true;
             }
 
@@ -136,9 +177,11 @@ namespace osu.Game.Rulesets.Catch.UI
                     break;
 
                 case CatchAction.Dash:
-                    MovableCatcher.Dashing = false;
+                    Catcher.Dashing = false;
                     break;
             }
         }
+
+        private void displayCatcherTrail(CatcherTrailAnimation animation) => catcherTrails.Add(new CatcherTrailEntry(Time.Current, Catcher.CurrentState, Catcher.X, Catcher.BodyScale, animation));
     }
 }

osu.Game.Rulesets.Catch/UI/CatcherTrail.cs

@@ -2,8 +2,8 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Pooling;
 using osu.Framework.Timing;
+using osu.Game.Rulesets.Objects.Pooling;
 using osuTK;
 
 namespace osu.Game.Rulesets.Catch.UI
@@ -12,18 +12,13 @@ namespace osu.Game.Rulesets.Catch.UI
     /// A trail of the catcher.
     /// It also represents a hyper dash afterimage.
     /// </summary>
-    public class CatcherTrail : PoolableDrawable
+    public class CatcherTrail : PoolableDrawableWithLifetime<CatcherTrailEntry>
     {
-        public CatcherAnimationState AnimationState
-        {
-            set => body.AnimationState.Value = value;
-        }
-
         private readonly SkinnableCatcher body;
 
         public CatcherTrail()
         {
-            Size = new Vector2(CatcherArea.CATCHER_SIZE);
+            Size = new Vector2(Catcher.BASE_SIZE);
             Origin = Anchor.TopCentre;
             Blending = BlendingParameters.Additive;
             InternalChild = body = new SkinnableCatcher
@@ -34,11 +29,40 @@ namespace osu.Game.Rulesets.Catch.UI
             };
         }
 
-        protected override void FreeAfterUse()
+        protected override void OnApply(CatcherTrailEntry entry)
         {
+            Position = new Vector2(entry.Position, 0);
+            Scale = entry.Scale;
+
+            body.AnimationState.Value = entry.CatcherState;
+
+            using (BeginAbsoluteSequence(entry.LifetimeStart, false))
+                applyTransforms(entry.Animation);
+        }
+
+        protected override void OnFree(CatcherTrailEntry entry)
+        {
+            ApplyTransformsAt(double.MinValue);
             ClearTransforms();
-            Alpha = 1;
-            base.FreeAfterUse();
+        }
+
+        private void applyTransforms(CatcherTrailAnimation animation)
+        {
+            switch (animation)
+            {
+                case CatcherTrailAnimation.Dashing:
+                case CatcherTrailAnimation.HyperDashing:
+                    this.FadeTo(0.4f).FadeOut(800, Easing.OutQuint);
+                    break;
+
+                case CatcherTrailAnimation.HyperDashAfterImage:
+                    this.MoveToOffset(new Vector2(0, -10), 1200, Easing.In);
+                    this.ScaleTo(Scale * 0.95f).ScaleTo(Scale * 1.2f, 1200, Easing.In);
+                    this.FadeOut(1200);
+                    break;
+            }
+
+            Expire();
         }
     }
 }

osu.Game.Rulesets.Catch/UI/CatcherTrailAnimation.cs

@@ -0,0 +1,12 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Rulesets.Catch.UI
+{
+    public enum CatcherTrailAnimation
+    {
+        Dashing,
+        HyperDashing,
+        HyperDashAfterImage
+    }
+}

osu.Game.Rulesets.Catch/UI/CatcherTrailDisplay.cs

@@ -2,11 +2,13 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
-using JetBrains.Annotations;
+using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Pooling;
-using osuTK;
+using osu.Game.Rulesets.Catch.Skinning;
+using osu.Game.Rulesets.Objects.Pooling;
+using osu.Game.Skinning;
 using osuTK.Graphics;
 
 namespace osu.Game.Rulesets.Catch.UI
@@ -15,70 +17,32 @@ namespace osu.Game.Rulesets.Catch.UI
     /// Represents a component responsible for displaying
     /// the appropriate catcher trails when requested to.
     /// </summary>
-    public class CatcherTrailDisplay : CompositeDrawable
+    public class CatcherTrailDisplay : PooledDrawableWithLifetimeContainer<CatcherTrailEntry, CatcherTrail>
     {
-        private readonly Catcher catcher;
+        /// <summary>
+        /// The most recent time a dash trail was added to this container.
+        /// Only alive (not faded out) trails are considered.
+        /// Returns <see cref="double.NegativeInfinity"/> if no dash trail is alive.
+        /// </summary>
+        public double LastDashTrailTime => getLastDashTrailTime();
+
+        public Color4 HyperDashTrailsColour => hyperDashTrails.Colour;
+
+        public Color4 HyperDashAfterImageColour => hyperDashAfterImages.Colour;
+
+        protected override bool RemoveRewoundEntry => true;
 
         private readonly DrawablePool<CatcherTrail> trailPool;
 
         private readonly Container<CatcherTrail> dashTrails;
         private readonly Container<CatcherTrail> hyperDashTrails;
-        private readonly Container<CatcherTrail> endGlowSprites;
+        private readonly Container<CatcherTrail> hyperDashAfterImages;
 
-        private Color4 hyperDashTrailsColour = Catcher.DEFAULT_HYPER_DASH_COLOUR;
+        [Resolved]
+        private ISkinSource skin { get; set; }
 
-        public Color4 HyperDashTrailsColour
+        public CatcherTrailDisplay()
         {
-            get => hyperDashTrailsColour;
-            set
-            {
-                if (hyperDashTrailsColour == value)
-                    return;
-
-                hyperDashTrailsColour = value;
-                hyperDashTrails.Colour = hyperDashTrailsColour;
-            }
-        }
-
-        private Color4 endGlowSpritesColour = Catcher.DEFAULT_HYPER_DASH_COLOUR;
-
-        public Color4 EndGlowSpritesColour
-        {
-            get => endGlowSpritesColour;
-            set
-            {
-                if (endGlowSpritesColour == value)
-                    return;
-
-                endGlowSpritesColour = value;
-                endGlowSprites.Colour = endGlowSpritesColour;
-            }
-        }
-
-        private bool trail;
-
-        /// <summary>
-        /// Whether to start displaying trails following the catcher.
-        /// </summary>
-        public bool DisplayTrail
-        {
-            get => trail;
-            set
-            {
-                if (trail == value)
-                    return;
-
-                trail = value;
-
-                if (trail)
-                    displayTrail();
-            }
-        }
-
-        public CatcherTrailDisplay([NotNull] Catcher catcher)
-        {
-            this.catcher = catcher ?? throw new ArgumentNullException(nameof(catcher));
-
             RelativeSizeAxes = Axes.Both;
 
             InternalChildren = new Drawable[]
@@ -86,47 +50,86 @@ namespace osu.Game.Rulesets.Catch.UI
                 trailPool = new DrawablePool<CatcherTrail>(30),
                 dashTrails = new Container<CatcherTrail> { RelativeSizeAxes = Axes.Both },
                 hyperDashTrails = new Container<CatcherTrail> { RelativeSizeAxes = Axes.Both, Colour = Catcher.DEFAULT_HYPER_DASH_COLOUR },
-                endGlowSprites = new Container<CatcherTrail> { RelativeSizeAxes = Axes.Both, Colour = Catcher.DEFAULT_HYPER_DASH_COLOUR },
+                hyperDashAfterImages = new Container<CatcherTrail> { RelativeSizeAxes = Axes.Both, Colour = Catcher.DEFAULT_HYPER_DASH_COLOUR },
             };
         }
 
-        /// <summary>
-        /// Displays a single end-glow catcher sprite.
-        /// </summary>
-        public void DisplayEndGlow()
+        protected override void LoadComplete()
         {
-            var endGlow = createTrailSprite(endGlowSprites);
+            base.LoadComplete();
 
-            endGlow.MoveToOffset(new Vector2(0, -10), 1200, Easing.In);
-            endGlow.ScaleTo(endGlow.Scale * 0.95f).ScaleTo(endGlow.Scale * 1.2f, 1200, Easing.In);
-            endGlow.FadeOut(1200);
-            endGlow.Expire(true);
+            skin.SourceChanged += skinSourceChanged;
+            skinSourceChanged();
         }
 
-        private void displayTrail()
+        private void skinSourceChanged()
         {
-            if (!DisplayTrail)
-                return;
-
-            var sprite = createTrailSprite(catcher.HyperDashing ? hyperDashTrails : dashTrails);
-
-            sprite.FadeTo(0.4f).FadeOut(800, Easing.OutQuint);
-            sprite.Expire(true);
-
-            Scheduler.AddDelayed(displayTrail, catcher.HyperDashing ? 25 : 50);
+            hyperDashTrails.Colour = skin.GetConfig<CatchSkinColour, Color4>(CatchSkinColour.HyperDash)?.Value ?? Catcher.DEFAULT_HYPER_DASH_COLOUR;
+            hyperDashAfterImages.Colour = skin.GetConfig<CatchSkinColour, Color4>(CatchSkinColour.HyperDashAfterImage)?.Value ?? hyperDashTrails.Colour;
         }
 
-        private CatcherTrail createTrailSprite(Container<CatcherTrail> target)
+        protected override void AddDrawable(CatcherTrailEntry entry, CatcherTrail drawable)
         {
-            CatcherTrail sprite = trailPool.Get();
+            switch (entry.Animation)
+            {
+                case CatcherTrailAnimation.Dashing:
+                    dashTrails.Add(drawable);
+                    break;
 
-            sprite.AnimationState = catcher.CurrentState;
-            sprite.Scale = catcher.Scale;
-            sprite.Position = catcher.Position;
+                case CatcherTrailAnimation.HyperDashing:
+                    hyperDashTrails.Add(drawable);
+                    break;
 
-            target.Add(sprite);
+                case CatcherTrailAnimation.HyperDashAfterImage:
+                    hyperDashAfterImages.Add(drawable);
+                    break;
+            }
+        }
 
-            return sprite;
+        protected override void RemoveDrawable(CatcherTrailEntry entry, CatcherTrail drawable)
+        {
+            switch (entry.Animation)
+            {
+                case CatcherTrailAnimation.Dashing:
+                    dashTrails.Remove(drawable);
+                    break;
+
+                case CatcherTrailAnimation.HyperDashing:
+                    hyperDashTrails.Remove(drawable);
+                    break;
+
+                case CatcherTrailAnimation.HyperDashAfterImage:
+                    hyperDashAfterImages.Remove(drawable);
+                    break;
+            }
+        }
+
+        protected override CatcherTrail GetDrawable(CatcherTrailEntry entry)
+        {
+            CatcherTrail trail = trailPool.Get();
+            trail.Apply(entry);
+            return trail;
+        }
+
+        private double getLastDashTrailTime()
+        {
+            double maxTime = double.NegativeInfinity;
+
+            foreach (var trail in dashTrails)
+                maxTime = Math.Max(maxTime, trail.LifetimeStart);
+
+            foreach (var trail in hyperDashTrails)
+                maxTime = Math.Max(maxTime, trail.LifetimeStart);
+
+            return maxTime;
+        }
+
+        protected override void Dispose(bool isDisposing)
+        {
+            base.Dispose(isDisposing);
+
+            if (skin != null)
+                skin.SourceChanged -= skinSourceChanged;
         }
     }
 }

osu.Game.Rulesets.Catch/UI/CatcherTrailEntry.cs

@@ -0,0 +1,31 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Graphics.Performance;
+using osuTK;
+
+namespace osu.Game.Rulesets.Catch.UI
+{
+    public class CatcherTrailEntry : LifetimeEntry
+    {
+        public readonly CatcherAnimationState CatcherState;
+
+        public readonly float Position;
+
+        /// <summary>
+        /// The scaling of the catcher body. It also represents a flipped catcher (negative x component).
+        /// </summary>
+        public readonly Vector2 Scale;
+
+        public readonly CatcherTrailAnimation Animation;
+
+        public CatcherTrailEntry(double startTime, CatcherAnimationState catcherState, float position, Vector2 scale, CatcherTrailAnimation animation)
+        {
+            LifetimeStart = startTime;
+            CatcherState = catcherState;
+            Position = position;
+            Scale = scale;
+            Animation = animation;
+        }
+    }
+}

osu.Game.Rulesets.Catch/UI/SkinnableCatcher.cs

@@ -27,7 +27,7 @@ namespace osu.Game.Rulesets.Catch.UI
         {
             Anchor = Anchor.TopCentre;
             // Sets the origin roughly to the centre of the catcher's plate to allow for correct scaling.
-            OriginPosition = new Vector2(0.5f, 0.06f) * CatcherArea.CATCHER_SIZE;
+            OriginPosition = new Vector2(0.5f, 0.06f) * Catcher.BASE_SIZE;
         }
     }
 }

osu.Game.Rulesets.Mania/Difficulty/ManiaPerformanceCalculator.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using osu.Framework.Extensions;
 using osu.Game.Rulesets.Difficulty;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Scoring;
@@ -37,12 +36,12 @@ namespace osu.Game.Rulesets.Mania.Difficulty
         {
             mods = Score.Mods;
             scaledScore = Score.TotalScore;
-            countPerfect = Score.Statistics.GetOrDefault(HitResult.Perfect);
-            countGreat = Score.Statistics.GetOrDefault(HitResult.Great);
-            countGood = Score.Statistics.GetOrDefault(HitResult.Good);
-            countOk = Score.Statistics.GetOrDefault(HitResult.Ok);
-            countMeh = Score.Statistics.GetOrDefault(HitResult.Meh);
-            countMiss = Score.Statistics.GetOrDefault(HitResult.Miss);
+            countPerfect = Score.Statistics.GetValueOrDefault(HitResult.Perfect);
+            countGreat = Score.Statistics.GetValueOrDefault(HitResult.Great);
+            countGood = Score.Statistics.GetValueOrDefault(HitResult.Good);
+            countOk = Score.Statistics.GetValueOrDefault(HitResult.Ok);
+            countMeh = Score.Statistics.GetValueOrDefault(HitResult.Meh);
+            countMiss = Score.Statistics.GetValueOrDefault(HitResult.Miss);
 
             IEnumerable<Mod> scoreIncreaseMods = Ruleset.GetModsFor(ModType.DifficultyIncrease);
 

osu.Game.Rulesets.Mania/ManiaRuleset.cs

@@ -253,7 +253,8 @@ namespace osu.Game.Rulesets.Mania
                 case ModType.Fun:
                     return new Mod[]
                     {
-                        new MultiMod(new ModWindUp(), new ModWindDown())
+                        new MultiMod(new ModWindUp(), new ModWindDown()),
+                        new ManiaModMuted(),
                     };
 
                 default:

osu.Game.Rulesets.Mania/ManiaSettingsSubsection.cs

@@ -13,7 +13,7 @@ namespace osu.Game.Rulesets.Mania
 {
     public class ManiaSettingsSubsection : RulesetSettingsSubsection
     {
-        protected override string Header => "osu!mania";
+        protected override LocalisableString Header => "osu!mania";
 
         public ManiaSettingsSubsection(ManiaRuleset ruleset)
             : base(ruleset)

osu.Game.Rulesets.Mania/Mods/ManiaModMirror.cs

@@ -10,13 +10,9 @@ using osu.Game.Rulesets.Mania.Beatmaps;
 
 namespace osu.Game.Rulesets.Mania.Mods
 {
-    public class ManiaModMirror : Mod, IApplicableToBeatmap
+    public class ManiaModMirror : ModMirror, IApplicableToBeatmap
     {
-        public override string Name => "Mirror";
-        public override string Acronym => "MR";
-        public override ModType Type => ModType.Conversion;
         public override string Description => "Notes are flipped horizontally.";
-        public override double ScoreMultiplier => 1;
 
         public void ApplyToBeatmap(IBeatmap beatmap)
         {

osu.Game.Rulesets.Mania/Mods/ManiaModMuted.cs

@@ -0,0 +1,12 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Rulesets.Mania.Objects;
+using osu.Game.Rulesets.Mods;
+
+namespace osu.Game.Rulesets.Mania.Mods
+{
+    public class ManiaModMuted : ModMuted<ManiaHitObject>
+    {
+    }
+}

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableManiaHitObject.cs

@@ -22,6 +22,10 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
 
         protected readonly IBindable<ScrollingDirection> Direction = new Bindable<ScrollingDirection>();
 
+        // Leaving the default (10s) makes hitobjects not appear, as this offset is used for the initial state transforms.
+        // Calculated as DrawableManiaRuleset.MAX_TIME_RANGE + some additional allowance for velocity < 1.
+        protected override double InitialLifetimeOffset => 30000;
+
         [Resolved(canBeNull: true)]
         private ManiaPlayfield playfield { get; set; }
 

osu.Game.Rulesets.Mania/UI/DrawableManiaRuleset.cs

@@ -33,12 +33,12 @@ namespace osu.Game.Rulesets.Mania.UI
         /// <summary>
         /// The minimum time range. This occurs at a <see cref="relativeTimeRange"/> of 40.
         /// </summary>
-        public const double MIN_TIME_RANGE = 340;
+        public const double MIN_TIME_RANGE = 290;
 
         /// <summary>
         /// The maximum time range. This occurs at a <see cref="relativeTimeRange"/> of 1.
         /// </summary>
-        public const double MAX_TIME_RANGE = 13720;
+        public const double MAX_TIME_RANGE = 11485;
 
         protected new ManiaPlayfield Playfield => (ManiaPlayfield)base.Playfield;
 
@@ -67,7 +67,7 @@ namespace osu.Game.Rulesets.Mania.UI
         protected override ScrollVisualisationMethod VisualisationMethod => scrollMethod;
 
         private readonly Bindable<ManiaScrollingDirection> configDirection = new Bindable<ManiaScrollingDirection>();
-        private readonly Bindable<double> configTimeRange = new BindableDouble();
+        private readonly BindableDouble configTimeRange = new BindableDouble();
 
         // Stores the current speed adjustment active in gameplay.
         private readonly Track speedAdjustmentTrack = new TrackVirtual(0);
@@ -103,6 +103,8 @@ namespace osu.Game.Rulesets.Mania.UI
             configDirection.BindValueChanged(direction => Direction.Value = (ScrollingDirection)direction.NewValue, true);
 
             Config.BindWith(ManiaRulesetSetting.ScrollTime, configTimeRange);
+            TimeRange.MinValue = configTimeRange.MinValue;
+            TimeRange.MaxValue = configTimeRange.MaxValue;
         }
 
         protected override void AdjustScrollSpeed(int amount)

osu.Game.Rulesets.Osu.Tests/Editor/Checks/CheckTooShortSlidersTest.cs

@@ -0,0 +1,145 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu.Edit.Checks;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Tests.Beatmaps;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor.Checks
+{
+    [TestFixture]
+    public class CheckTooShortSlidersTest
+    {
+        private CheckTooShortSliders check;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckTooShortSliders();
+        }
+
+        [Test]
+        public void TestLongSlider()
+        {
+            Slider slider = new Slider
+            {
+                StartTime = 0,
+                RepeatCount = 0,
+                Path = new SliderPath(new[]
+                {
+                    new PathControlPoint(new Vector2(0, 0)),
+                    new PathControlPoint(new Vector2(100, 0))
+                })
+            };
+
+            slider.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+            assertOk(new List<HitObject> { slider });
+        }
+
+        [Test]
+        public void TestShortSlider()
+        {
+            Slider slider = new Slider
+            {
+                StartTime = 0,
+                RepeatCount = 0,
+                Path = new SliderPath(new[]
+                {
+                    new PathControlPoint(new Vector2(0, 0)),
+                    new PathControlPoint(new Vector2(25, 0))
+                })
+            };
+
+            slider.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+            assertOk(new List<HitObject> { slider });
+        }
+
+        [Test]
+        public void TestTooShortSliderExpert()
+        {
+            Slider slider = new Slider
+            {
+                StartTime = 0,
+                RepeatCount = 0,
+                Path = new SliderPath(new[]
+                {
+                    new PathControlPoint(new Vector2(0, 0)),
+                    new PathControlPoint(new Vector2(10, 0))
+                })
+            };
+
+            slider.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+            assertOk(new List<HitObject> { slider }, DifficultyRating.Expert);
+        }
+
+        [Test]
+        public void TestTooShortSlider()
+        {
+            Slider slider = new Slider
+            {
+                StartTime = 0,
+                RepeatCount = 0,
+                Path = new SliderPath(new[]
+                {
+                    new PathControlPoint(new Vector2(0, 0)),
+                    new PathControlPoint(new Vector2(10, 0))
+                })
+            };
+
+            slider.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+            assertTooShort(new List<HitObject> { slider });
+        }
+
+        [Test]
+        public void TestTooShortSliderWithRepeats()
+        {
+            // Would be ok if we looked at the duration, but not if we look at the span duration.
+            Slider slider = new Slider
+            {
+                StartTime = 0,
+                RepeatCount = 2,
+                Path = new SliderPath(new[]
+                {
+                    new PathControlPoint(new Vector2(0, 0)),
+                    new PathControlPoint(new Vector2(10, 0))
+                })
+            };
+
+            slider.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+            assertTooShort(new List<HitObject> { slider });
+        }
+
+        private void assertOk(List<HitObject> hitObjects, DifficultyRating difficultyRating = DifficultyRating.Easy)
+        {
+            Assert.That(check.Run(getContext(hitObjects, difficultyRating)), Is.Empty);
+        }
+
+        private void assertTooShort(List<HitObject> hitObjects, DifficultyRating difficultyRating = DifficultyRating.Easy)
+        {
+            var issues = check.Run(getContext(hitObjects, difficultyRating)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.First().Template is CheckTooShortSliders.IssueTemplateTooShort);
+        }
+
+        private BeatmapVerifierContext getContext(List<HitObject> hitObjects, DifficultyRating difficultyRating)
+        {
+            var beatmap = new Beatmap<HitObject> { HitObjects = hitObjects };
+
+            return new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+        }
+    }
+}

osu.Game.Rulesets.Osu.Tests/Editor/Checks/CheckTooShortSpinnersTest.cs

@@ -0,0 +1,116 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu.Edit.Checks;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor.Checks
+{
+    [TestFixture]
+    public class CheckTooShortSpinnersTest
+    {
+        private CheckTooShortSpinners check;
+        private BeatmapDifficulty difficulty;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckTooShortSpinners();
+            difficulty = new BeatmapDifficulty();
+        }
+
+        [Test]
+        public void TestLongSpinner()
+        {
+            Spinner spinner = new Spinner { StartTime = 0, Duration = 4000 };
+            spinner.ApplyDefaults(new ControlPointInfo(), difficulty);
+
+            assertOk(new List<HitObject> { spinner }, difficulty);
+        }
+
+        [Test]
+        public void TestShortSpinner()
+        {
+            Spinner spinner = new Spinner { StartTime = 0, Duration = 750 };
+            spinner.ApplyDefaults(new ControlPointInfo(), difficulty);
+
+            assertOk(new List<HitObject> { spinner }, difficulty);
+        }
+
+        [Test]
+        public void TestVeryShortSpinner()
+        {
+            // Spinners at a certain duration only get 1000 points if approached by auto at a certain angle, making it difficult to determine.
+            Spinner spinner = new Spinner { StartTime = 0, Duration = 475 };
+            spinner.ApplyDefaults(new ControlPointInfo(), difficulty);
+
+            assertVeryShort(new List<HitObject> { spinner }, difficulty);
+        }
+
+        [Test]
+        public void TestTooShortSpinner()
+        {
+            Spinner spinner = new Spinner { StartTime = 0, Duration = 400 };
+            spinner.ApplyDefaults(new ControlPointInfo(), difficulty);
+
+            assertTooShort(new List<HitObject> { spinner }, difficulty);
+        }
+
+        [Test]
+        public void TestTooShortSpinnerVaryingOd()
+        {
+            const double duration = 450;
+
+            var difficultyLowOd = new BeatmapDifficulty { OverallDifficulty = 1 };
+            Spinner spinnerLowOd = new Spinner { StartTime = 0, Duration = duration };
+            spinnerLowOd.ApplyDefaults(new ControlPointInfo(), difficultyLowOd);
+
+            var difficultyHighOd = new BeatmapDifficulty { OverallDifficulty = 10 };
+            Spinner spinnerHighOd = new Spinner { StartTime = 0, Duration = duration };
+            spinnerHighOd.ApplyDefaults(new ControlPointInfo(), difficultyHighOd);
+
+            assertOk(new List<HitObject> { spinnerLowOd }, difficultyLowOd);
+            assertTooShort(new List<HitObject> { spinnerHighOd }, difficultyHighOd);
+        }
+
+        private void assertOk(List<HitObject> hitObjects, BeatmapDifficulty beatmapDifficulty)
+        {
+            Assert.That(check.Run(getContext(hitObjects, beatmapDifficulty)), Is.Empty);
+        }
+
+        private void assertVeryShort(List<HitObject> hitObjects, BeatmapDifficulty beatmapDifficulty)
+        {
+            var issues = check.Run(getContext(hitObjects, beatmapDifficulty)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.First().Template is CheckTooShortSpinners.IssueTemplateVeryShort);
+        }
+
+        private void assertTooShort(List<HitObject> hitObjects, BeatmapDifficulty beatmapDifficulty)
+        {
+            var issues = check.Run(getContext(hitObjects, beatmapDifficulty)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.First().Template is CheckTooShortSpinners.IssueTemplateTooShort);
+        }
+
+        private BeatmapVerifierContext getContext(List<HitObject> hitObjects, BeatmapDifficulty beatmapDifficulty)
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = hitObjects,
+                BeatmapInfo = new BeatmapInfo { BaseDifficulty = beatmapDifficulty }
+            };
+
+            return new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap));
+        }
+    }
+}

osu.Game.Rulesets.Osu.Tests/Mods/TestSceneOsuModMuted.cs

@@ -0,0 +1,52 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Testing;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Osu.Mods;
+
+namespace osu.Game.Rulesets.Osu.Tests.Mods
+{
+    public class TestSceneOsuModMuted : OsuModTestScene
+    {
+        /// <summary>
+        /// Ensures that a final volume combo of 0 (i.e. "always muted" mode) constantly plays metronome and completely mutes track.
+        /// </summary>
+        [Test]
+        public void TestZeroFinalCombo() => CreateModTest(new ModTestData
+        {
+            Mod = new OsuModMuted
+            {
+                MuteComboCount = { Value = 0 },
+            },
+            PassCondition = () => Beatmap.Value.Track.AggregateVolume.Value == 0.0 &&
+                                  Player.ChildrenOfType<Metronome>().SingleOrDefault()?.AggregateVolume.Value == 1.0,
+        });
+
+        /// <summary>
+        /// Ensures that copying from a normal mod with 0 final combo while originally inversed does not yield incorrect results.
+        /// </summary>
+        [Test]
+        public void TestModCopy()
+        {
+            OsuModMuted muted = null;
+
+            AddStep("create inversed mod", () => muted = new OsuModMuted
+            {
+                MuteComboCount = { Value = 100 },
+                InverseMuting = { Value = true },
+            });
+
+            AddStep("copy from normal", () => muted.CopyFrom(new OsuModMuted
+            {
+                MuteComboCount = { Value = 0 },
+                InverseMuting = { Value = false },
+            }));
+
+            AddAssert("mute combo count = 0", () => muted.MuteComboCount.Value == 0);
+            AddAssert("inverse muting = false", () => muted.InverseMuting.Value == false);
+        }
+    }
+}

osu.Game.Rulesets.Osu.Tests/OsuDifficultyCalculatorTest.cs

@@ -15,13 +15,13 @@ namespace osu.Game.Rulesets.Osu.Tests
     {
         protected override string ResourceAssembly => "osu.Game.Rulesets.Osu";
 
-        [TestCase(6.9311451172574934d, "diffcalc-test")]
-        [TestCase(1.0736586907780401d, "zero-length-sliders")]
+        [TestCase(6.7568168283591499d, "diffcalc-test")]
+        [TestCase(1.0348244046058293d, "zero-length-sliders")]
         public void Test(double expected, string name)
             => base.Test(expected, name);
 
-        [TestCase(8.7212283220412345d, "diffcalc-test")]
-        [TestCase(1.3212137158641493d, "zero-length-sliders")]
+        [TestCase(8.4783236764532557d, "diffcalc-test")]
+        [TestCase(1.2708532136987165d, "zero-length-sliders")]
         public void TestClockRateAdjusted(double expected, string name)
             => Test(expected, name, new OsuModDoubleTime());
 

osu.Game.Rulesets.Osu.Tests/TestSceneGameplayCursor.cs

@@ -121,7 +121,7 @@ namespace osu.Game.Rulesets.Osu.Tests
                 {
                     case OsuSkinConfiguration osuLookup:
                         if (osuLookup == OsuSkinConfiguration.CursorCentre)
-                            return SkinUtils.As<TValue>(new BindableBool(false));
+                            return SkinUtils.As<TValue>(new BindableBool());
 
                         break;
                 }

osu.Game.Rulesets.Osu.Tests/TestSceneLegacyBeatmapSkin.cs

@@ -1,16 +1,21 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Audio;
 using osu.Game.Beatmaps;
 using osu.Game.Configuration;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Skinning;
 using osu.Game.Tests.Beatmaps;
 using osuTK;
+using osuTK.Graphics;
 
 namespace osu.Game.Rulesets.Osu.Tests
 {
@@ -77,23 +82,106 @@ namespace osu.Game.Rulesets.Osu.Tests
             AddAssert("is custom user skin colours", () => TestPlayer.UsableComboColours.SequenceEqual(TestSkin.Colours));
         }
 
+        [TestCase(true, true)]
+        [TestCase(true, false)]
+        [TestCase(false, true)]
+        [TestCase(false, false)]
+        public void TestComboOffsetWithBeatmapColours(bool userHasCustomColours, bool useBeatmapSkin)
+        {
+            PrepareBeatmap(() => new OsuCustomSkinWorkingBeatmap(audio, true, getHitCirclesWithLegacyOffsets()));
+            ConfigureTest(useBeatmapSkin, true, userHasCustomColours);
+            assertCorrectObjectComboColours("is beatmap skin colours with combo offsets applied",
+                TestBeatmapSkin.Colours,
+                (i, obj) => i + 1 + obj.ComboOffset);
+        }
+
+        [TestCase(true)]
+        [TestCase(false)]
+        public void TestComboOffsetWithIgnoredBeatmapColours(bool useBeatmapSkin)
+        {
+            PrepareBeatmap(() => new OsuCustomSkinWorkingBeatmap(audio, true, getHitCirclesWithLegacyOffsets()));
+            ConfigureTest(useBeatmapSkin, false, true);
+            assertCorrectObjectComboColours("is user skin colours without combo offsets applied",
+                TestSkin.Colours,
+                (i, _) => i + 1);
+        }
+
+        private void assertCorrectObjectComboColours(string description, Color4[] expectedColours, Func<int, OsuHitObject, int> nextExpectedComboIndex)
+        {
+            AddUntilStep("wait for objects to become alive", () =>
+                TestPlayer.DrawableRuleset.Playfield.AllHitObjects.Count() == TestPlayer.DrawableRuleset.Objects.Count());
+
+            AddAssert(description, () =>
+            {
+                int index = 0;
+
+                return TestPlayer.DrawableRuleset.Playfield.AllHitObjects.All(d =>
+                {
+                    index = nextExpectedComboIndex(index, (OsuHitObject)d.HitObject);
+                    return checkComboColour(d, expectedColours[index % expectedColours.Length]);
+                });
+            });
+
+            static bool checkComboColour(DrawableHitObject drawableHitObject, Color4 expectedColour)
+            {
+                return drawableHitObject.AccentColour.Value == expectedColour &&
+                       drawableHitObject.NestedHitObjects.All(n => checkComboColour(n, expectedColour));
+            }
+        }
+
+        private static IEnumerable<OsuHitObject> getHitCirclesWithLegacyOffsets()
+        {
+            var hitObjects = new List<OsuHitObject>();
+
+            for (int i = 0; i < 10; i++)
+            {
+                var hitObject = i % 2 == 0
+                    ? (OsuHitObject)new HitCircle()
+                    : new Slider
+                    {
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0)),
+                            new PathControlPoint(new Vector2(100, 0)),
+                        })
+                    };
+
+                hitObject.StartTime = i;
+                hitObject.Position = new Vector2(256, 192);
+                hitObject.NewCombo = true;
+                hitObject.ComboOffset = i;
+
+                hitObjects.Add(hitObject);
+            }
+
+            return hitObjects;
+        }
+
         private class OsuCustomSkinWorkingBeatmap : CustomSkinWorkingBeatmap
         {
-            public OsuCustomSkinWorkingBeatmap(AudioManager audio, bool hasColours)
-                : base(createBeatmap(), audio, hasColours)
+            public OsuCustomSkinWorkingBeatmap(AudioManager audio, bool hasColours, IEnumerable<OsuHitObject> hitObjects = null)
+                : base(createBeatmap(hitObjects), audio, hasColours)
             {
             }
 
-            private static IBeatmap createBeatmap() =>
-                new Beatmap
+            private static IBeatmap createBeatmap(IEnumerable<OsuHitObject> hitObjects)
+            {
+                var beatmap = new Beatmap
                 {
                     BeatmapInfo =
                     {
                         BeatmapSet = new BeatmapSetInfo(),
                         Ruleset = new OsuRuleset().RulesetInfo,
                     },
-                    HitObjects = { new HitCircle { Position = new Vector2(256, 192) } }
                 };
+
+                beatmap.HitObjects.AddRange(hitObjects ?? new[]
+                {
+                    new HitCircle { Position = new Vector2(256, 192) }
+                });
+
+                return beatmap;
+            }
         }
     }
 }

osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using osu.Framework.Extensions;
 using osu.Game.Rulesets.Difficulty;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Mods;
@@ -36,10 +35,10 @@ namespace osu.Game.Rulesets.Osu.Difficulty
             mods = Score.Mods;
             accuracy = Score.Accuracy;
             scoreMaxCombo = Score.MaxCombo;
-            countGreat = Score.Statistics.GetOrDefault(HitResult.Great);
-            countOk = Score.Statistics.GetOrDefault(HitResult.Ok);
-            countMeh = Score.Statistics.GetOrDefault(HitResult.Meh);
-            countMiss = Score.Statistics.GetOrDefault(HitResult.Miss);
+            countGreat = Score.Statistics.GetValueOrDefault(HitResult.Great);
+            countOk = Score.Statistics.GetValueOrDefault(HitResult.Ok);
+            countMeh = Score.Statistics.GetValueOrDefault(HitResult.Meh);
+            countMiss = Score.Statistics.GetValueOrDefault(HitResult.Miss);
 
             // Custom multipliers for NoFail and SpunOut.
             double multiplier = 1.12; // This is being adjusted to keep the final pp value scaled around what it used to be when changing things
@@ -98,26 +97,32 @@ namespace osu.Game.Rulesets.Osu.Difficulty
 
             double approachRateFactor = 0.0;
             if (Attributes.ApproachRate > 10.33)
-                approachRateFactor += 0.4 * (Attributes.ApproachRate - 10.33);
+                approachRateFactor = Attributes.ApproachRate - 10.33;
             else if (Attributes.ApproachRate < 8.0)
-                approachRateFactor += 0.01 * (8.0 - Attributes.ApproachRate);
+                approachRateFactor = 0.025 * (8.0 - Attributes.ApproachRate);
 
-            aimValue *= 1.0 + Math.Min(approachRateFactor, approachRateFactor * (totalHits / 1000.0));
+            double approachRateTotalHitsFactor = 1.0 / (1.0 + Math.Exp(-(0.007 * (totalHits - 400))));
+
+            double approachRateBonus = 1.0 + (0.03 + 0.37 * approachRateTotalHitsFactor) * approachRateFactor;
 
             // We want to give more reward for lower AR when it comes to aim and HD. This nerfs high AR and buffs lower AR.
             if (mods.Any(h => h is OsuModHidden))
                 aimValue *= 1.0 + 0.04 * (12.0 - Attributes.ApproachRate);
 
+            double flashlightBonus = 1.0;
+
             if (mods.Any(h => h is OsuModFlashlight))
             {
                 // Apply object-based bonus for flashlight.
-                aimValue *= 1.0 + 0.35 * Math.Min(1.0, totalHits / 200.0) +
-                            (totalHits > 200
-                                ? 0.3 * Math.Min(1.0, (totalHits - 200) / 300.0) +
-                                  (totalHits > 500 ? (totalHits - 500) / 1200.0 : 0.0)
-                                : 0.0);
+                flashlightBonus = 1.0 + 0.35 * Math.Min(1.0, totalHits / 200.0) +
+                                  (totalHits > 200
+                                      ? 0.3 * Math.Min(1.0, (totalHits - 200) / 300.0) +
+                                        (totalHits > 500 ? (totalHits - 500) / 1200.0 : 0.0)
+                                      : 0.0);
             }
 
+            aimValue *= Math.Max(flashlightBonus, approachRateBonus);
+
             // Scale the aim value with accuracy _slightly_
             aimValue *= 0.5 + accuracy / 2.0;
             // It is important to also consider accuracy difficulty when doing that
@@ -145,9 +150,11 @@ namespace osu.Game.Rulesets.Osu.Difficulty
 
             double approachRateFactor = 0.0;
             if (Attributes.ApproachRate > 10.33)
-                approachRateFactor += 0.4 * (Attributes.ApproachRate - 10.33);
+                approachRateFactor = Attributes.ApproachRate - 10.33;
 
-            speedValue *= 1.0 + Math.Min(approachRateFactor, approachRateFactor * (totalHits / 1000.0));
+            double approachRateTotalHitsFactor = 1.0 / (1.0 + Math.Exp(-(0.007 * (totalHits - 400))));
+
+            speedValue *= 1.0 + (0.03 + 0.37 * approachRateTotalHitsFactor) * approachRateFactor;
 
             if (mods.Any(m => m is OsuModHidden))
                 speedValue *= 1.0 + 0.04 * (12.0 - Attributes.ApproachRate);

osu.Game.Rulesets.Osu/Difficulty/Skills/Aim.cs

@@ -3,7 +3,6 @@
 
 using System;
 using osu.Game.Rulesets.Difficulty.Preprocessing;
-using osu.Game.Rulesets.Difficulty.Skills;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
 using osu.Game.Rulesets.Osu.Objects;
@@ -13,7 +12,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
     /// <summary>
     /// Represents the skill required to correctly aim at every object in the map with a uniform CircleSize and normalized distances.
     /// </summary>
-    public class Aim : StrainSkill
+    public class Aim : OsuStrainSkill
     {
         private const double angle_bonus_begin = Math.PI / 3;
         private const double timing_threshold = 107;
@@ -47,7 +46,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
                         Math.Max(osuPrevious.JumpDistance - scale, 0)
                         * Math.Pow(Math.Sin(osuCurrent.Angle.Value - angle_bonus_begin), 2)
                         * Math.Max(osuCurrent.JumpDistance - scale, 0));
-                    result = 1.5 * applyDiminishingExp(Math.Max(0, angleBonus)) / Math.Max(timing_threshold, osuPrevious.StrainTime);
+                    result = 1.4 * applyDiminishingExp(Math.Max(0, angleBonus)) / Math.Max(timing_threshold, osuPrevious.StrainTime);
                 }
             }
 

osu.Game.Rulesets.Osu/Difficulty/Skills/OsuStrainSkill.cs

@@ -0,0 +1,61 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using osu.Game.Rulesets.Difficulty.Skills;
+using osu.Game.Rulesets.Mods;
+using System.Linq;
+using osu.Framework.Utils;
+
+namespace osu.Game.Rulesets.Osu.Difficulty.Skills
+{
+    public abstract class OsuStrainSkill : StrainSkill
+    {
+        /// <summary>
+        /// The number of sections with the highest strains, which the peak strain reductions will apply to.
+        /// This is done in order to decrease their impact on the overall difficulty of the map for this skill.
+        /// </summary>
+        protected virtual int ReducedSectionCount => 10;
+
+        /// <summary>
+        /// The baseline multiplier applied to the section with the biggest strain.
+        /// </summary>
+        protected virtual double ReducedStrainBaseline => 0.75;
+
+        /// <summary>
+        /// The final multiplier to be applied to <see cref="DifficultyValue"/> after all other calculations.
+        /// </summary>
+        protected virtual double DifficultyMultiplier => 1.06;
+
+        protected OsuStrainSkill(Mod[] mods)
+            : base(mods)
+        {
+        }
+
+        public override double DifficultyValue()
+        {
+            double difficulty = 0;
+            double weight = 1;
+
+            List<double> strains = GetCurrentStrainPeaks().OrderByDescending(d => d).ToList();
+
+            // We are reducing the highest strains first to account for extreme difficulty spikes
+            for (int i = 0; i < Math.Min(strains.Count, ReducedSectionCount); i++)
+            {
+                double scale = Math.Log10(Interpolation.Lerp(1, 10, Math.Clamp((float)i / ReducedSectionCount, 0, 1)));
+                strains[i] *= Interpolation.Lerp(ReducedStrainBaseline, 1.0, scale);
+            }
+
+            // Difficulty is the weighted sum of the highest strains from every section.
+            // We're sorting from highest to lowest strain.
+            foreach (double strain in strains.OrderByDescending(d => d))
+            {
+                difficulty += strain * weight;
+                weight *= DecayWeight;
+            }
+
+            return difficulty * DifficultyMultiplier;
+        }
+    }
+}

osu.Game.Rulesets.Osu/Difficulty/Skills/Speed.cs

@@ -3,7 +3,6 @@
 
 using System;
 using osu.Game.Rulesets.Difficulty.Preprocessing;
-using osu.Game.Rulesets.Difficulty.Skills;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
 using osu.Game.Rulesets.Osu.Objects;
@@ -13,7 +12,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
     /// <summary>
     /// Represents the skill required to press keys with regards to keeping up with the speed at which objects need to be hit.
     /// </summary>
-    public class Speed : StrainSkill
+    public class Speed : OsuStrainSkill
     {
         private const double single_spacing_threshold = 125;
 
@@ -23,6 +22,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
 
         protected override double SkillMultiplier => 1400;
         protected override double StrainDecayBase => 0.3;
+        protected override int ReducedSectionCount => 5;
+        protected override double DifficultyMultiplier => 1.04;
 
         private const double min_speed_bonus = 75; // ~200BPM
         private const double max_speed_bonus = 45; // ~330BPM

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/Components/PathControlPointVisualiser.cs

@@ -129,9 +129,9 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
 
         public bool OnPressed(PlatformAction action)
         {
-            switch (action.ActionMethod)
+            switch (action)
             {
-                case PlatformActionMethod.Delete:
+                case PlatformAction.Delete:
                     return DeleteSelected();
             }
 

osu.Game.Rulesets.Osu/Edit/Checks/CheckTooShortSliders.cs

@@ -0,0 +1,48 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Osu.Objects;
+
+namespace osu.Game.Rulesets.Osu.Edit.Checks
+{
+    public class CheckTooShortSliders : ICheck
+    {
+        /// <summary>
+        /// The shortest acceptable duration between the head and tail of the slider (so ignoring repeats).
+        /// </summary>
+        private const double span_duration_threshold = 125; // 240 BPM 1/2
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Spread, "Too short sliders");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateTooShort(this)
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            if (context.InterpretedDifficulty > DifficultyRating.Easy)
+                yield break;
+
+            foreach (var hitObject in context.Beatmap.HitObjects)
+            {
+                if (hitObject is Slider slider && slider.SpanDuration < span_duration_threshold)
+                    yield return new IssueTemplateTooShort(this).Create(slider);
+            }
+        }
+
+        public class IssueTemplateTooShort : IssueTemplate
+        {
+            public IssueTemplateTooShort(ICheck check)
+                : base(check, IssueType.Problem, "This slider is too short ({0:0} ms), expected at least {1:0} ms.")
+            {
+            }
+
+            public Issue Create(Slider slider) => new Issue(slider, this, slider.SpanDuration, span_duration_threshold);
+        }
+    }
+}

osu.Game.Rulesets.Osu/Edit/Checks/CheckTooShortSpinners.cs

@@ -0,0 +1,61 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Osu.Objects;
+
+namespace osu.Game.Rulesets.Osu.Edit.Checks
+{
+    public class CheckTooShortSpinners : ICheck
+    {
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Spread, "Too short spinners");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateTooShort(this)
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            double od = context.Beatmap.BeatmapInfo.BaseDifficulty.OverallDifficulty;
+
+            // These are meant to reflect the duration necessary for auto to score at least 1000 points on the spinner.
+            // It's difficult to eliminate warnings here, as auto achieving 1000 points depends on the approach angle on some spinners.
+            double warningThreshold = 500 + (od < 5 ? (5 - od) * -21.8 : (od - 5) * 20); // Anything above this is always ok.
+            double problemThreshold = 450 + (od < 5 ? (5 - od) * -17 : (od - 5) * 17); // Anything below this is never ok.
+
+            foreach (var hitObject in context.Beatmap.HitObjects)
+            {
+                if (!(hitObject is Spinner spinner))
+                    continue;
+
+                if (spinner.Duration < problemThreshold)
+                    yield return new IssueTemplateTooShort(this).Create(spinner);
+                else if (spinner.Duration < warningThreshold)
+                    yield return new IssueTemplateVeryShort(this).Create(spinner);
+            }
+        }
+
+        public class IssueTemplateTooShort : IssueTemplate
+        {
+            public IssueTemplateTooShort(ICheck check)
+                : base(check, IssueType.Problem, "This spinner is too short. Auto cannot achieve 1000 points on this.")
+            {
+            }
+
+            public Issue Create(Spinner spinner) => new Issue(spinner, this);
+        }
+
+        public class IssueTemplateVeryShort : IssueTemplate
+        {
+            public IssueTemplateVeryShort(ICheck check)
+                : base(check, IssueType.Warning, "This spinner may be too short. Ensure auto can achieve 1000 points on this.")
+            {
+            }
+
+            public Issue Create(Spinner spinner) => new Issue(spinner, this);
+        }
+    }
+}

osu.Game.Rulesets.Osu/Edit/OsuBeatmapVerifier.cs

@@ -15,10 +15,12 @@ namespace osu.Game.Rulesets.Osu.Edit
         {
             // Compose
             new CheckOffscreenObjects(),
+            new CheckTooShortSpinners(),
 
             // Spread
             new CheckTimeDistanceEquality(),
-            new CheckLowDiffOverlaps()
+            new CheckLowDiffOverlaps(),
+            new CheckTooShortSliders(),
         };
 
         public IEnumerable<Issue> Run(BeatmapVerifierContext context)

osu.Game.Rulesets.Osu/Edit/OsuSelectionHandler.cs

@@ -35,8 +35,8 @@ namespace osu.Game.Rulesets.Osu.Edit
             Quad quad = selectedMovableObjects.Length > 0 ? getSurroundingQuad(selectedMovableObjects) : new Quad();
 
             SelectionBox.CanRotate = quad.Width > 0 || quad.Height > 0;
-            SelectionBox.CanScaleX = quad.Width > 0;
-            SelectionBox.CanScaleY = quad.Height > 0;
+            SelectionBox.CanFlipX = SelectionBox.CanScaleX = quad.Width > 0;
+            SelectionBox.CanFlipY = SelectionBox.CanScaleY = quad.Height > 0;
             SelectionBox.CanReverse = EditorBeatmap.SelectedHitObjects.Count > 1 || EditorBeatmap.SelectedHitObjects.Any(s => s is Slider);
         }
 
@@ -76,32 +76,8 @@ namespace osu.Game.Rulesets.Osu.Edit
 
                 if (h is Slider slider)
                 {
-                    var points = slider.Path.ControlPoints.ToArray();
-                    Vector2 endPos = points.Last().Position.Value;
-
-                    slider.Path.ControlPoints.Clear();
-
-                    slider.Position += endPos;
-
-                    PathType? lastType = null;
-
-                    for (var i = 0; i < points.Length; i++)
-                    {
-                        var p = points[i];
-                        p.Position.Value -= endPos;
-
-                        // propagate types forwards to last null type
-                        if (i == points.Length - 1)
-                            p.Type.Value = lastType;
-                        else if (p.Type.Value != null)
-                        {
-                            var newType = p.Type.Value;
-                            p.Type.Value = lastType;
-                            lastType = newType;
-                        }
-
-                        slider.Path.ControlPoints.Insert(0, p);
-                    }
+                    slider.Path.Reverse(out Vector2 offset);
+                    slider.Position += offset;
                 }
             }
 

osu.Game.Rulesets.Osu/Mods/OsuModBlinds.cs

@@ -158,17 +158,17 @@ namespace osu.Game.Rulesets.Osu.Mods
                 var firstObj = beatmap.HitObjects[0];
                 var startDelay = firstObj.StartTime - firstObj.TimePreempt;
 
-                using (BeginAbsoluteSequence(startDelay + break_close_late, true))
+                using (BeginAbsoluteSequence(startDelay + break_close_late))
                     leaveBreak();
 
                 foreach (var breakInfo in beatmap.Breaks)
                 {
                     if (breakInfo.HasEffect)
                     {
-                        using (BeginAbsoluteSequence(breakInfo.StartTime - break_open_early, true))
+                        using (BeginAbsoluteSequence(breakInfo.StartTime - break_open_early))
                         {
                             enterBreak();
-                            using (BeginDelayedSequence(breakInfo.Duration + break_open_early + break_close_late, true))
+                            using (BeginDelayedSequence(breakInfo.Duration + break_open_early + break_close_late))
                                 leaveBreak();
                         }
                     }

osu.Game.Rulesets.Osu/Mods/OsuModDifficultyAdjust.cs

@@ -2,7 +2,6 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Linq;
-using osu.Framework.Bindables;
 using osu.Game.Beatmaps;
 using osu.Game.Configuration;
 using osu.Game.Rulesets.Mods;
@@ -11,34 +10,26 @@ namespace osu.Game.Rulesets.Osu.Mods
 {
     public class OsuModDifficultyAdjust : ModDifficultyAdjust
     {
-        [SettingSource("Circle Size", "Override a beatmap's set CS.", FIRST_SETTING_ORDER - 1)]
-        public BindableNumber<float> CircleSize { get; } = new BindableFloatWithLimitExtension
+        [SettingSource("Circle Size", "Override a beatmap's set CS.", FIRST_SETTING_ORDER - 1, SettingControlType = typeof(DifficultyAdjustSettingsControl))]
+        public DifficultyBindable CircleSize { get; } = new DifficultyBindable
         {
             Precision = 0.1f,
             MinValue = 0,
             MaxValue = 10,
-            Default = 5,
-            Value = 5,
+            ExtendedMaxValue = 11,
+            ReadCurrentFromDifficulty = diff => diff.CircleSize,
         };
 
-        [SettingSource("Approach Rate", "Override a beatmap's set AR.", LAST_SETTING_ORDER + 1)]
-        public BindableNumber<float> ApproachRate { get; } = new BindableFloatWithLimitExtension
+        [SettingSource("Approach Rate", "Override a beatmap's set AR.", LAST_SETTING_ORDER + 1, SettingControlType = typeof(DifficultyAdjustSettingsControl))]
+        public DifficultyBindable ApproachRate { get; } = new DifficultyBindable
         {
             Precision = 0.1f,
             MinValue = 0,
             MaxValue = 10,
-            Default = 5,
-            Value = 5,
+            ExtendedMaxValue = 11,
+            ReadCurrentFromDifficulty = diff => diff.ApproachRate,
         };
 
-        protected override void ApplyLimits(bool extended)
-        {
-            base.ApplyLimits(extended);
-
-            CircleSize.MaxValue = extended ? 11 : 10;
-            ApproachRate.MaxValue = extended ? 11 : 10;
-        }
-
         public override string SettingDescription
         {
             get
@@ -55,20 +46,12 @@ namespace osu.Game.Rulesets.Osu.Mods
             }
         }
 
-        protected override void TransferSettings(BeatmapDifficulty difficulty)
-        {
-            base.TransferSettings(difficulty);
-
-            TransferSetting(CircleSize, difficulty.CircleSize);
-            TransferSetting(ApproachRate, difficulty.ApproachRate);
-        }
-
         protected override void ApplySettings(BeatmapDifficulty difficulty)
         {
             base.ApplySettings(difficulty);
 
-            ApplySetting(CircleSize, cs => difficulty.CircleSize = cs);
-            ApplySetting(ApproachRate, ar => difficulty.ApproachRate = ar);
+            if (CircleSize.Value != null) difficulty.CircleSize = CircleSize.Value.Value;
+            if (ApproachRate.Value != null) difficulty.ApproachRate = ApproachRate.Value.Value;
         }
     }
 }

osu.Game.Rulesets.Osu/Mods/OsuModHardRock.cs

@@ -1,13 +1,12 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Linq;
-using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Osu.Objects;
-using osu.Game.Rulesets.Osu.UI;
-using osuTK;
+using osu.Game.Rulesets.Osu.Utils;
 
 namespace osu.Game.Rulesets.Osu.Mods
 {
@@ -15,23 +14,13 @@ namespace osu.Game.Rulesets.Osu.Mods
     {
         public override double ScoreMultiplier => 1.06;
 
+        public override Type[] IncompatibleMods => base.IncompatibleMods.Append(typeof(ModMirror)).ToArray();
+
         public void ApplyToHitObject(HitObject hitObject)
         {
             var osuObject = (OsuHitObject)hitObject;
 
-            osuObject.Position = new Vector2(osuObject.Position.X, OsuPlayfield.BASE_SIZE.Y - osuObject.Y);
-
-            if (!(hitObject is Slider slider))
-                return;
-
-            slider.NestedHitObjects.OfType<SliderTick>().ForEach(h => h.Position = new Vector2(h.Position.X, OsuPlayfield.BASE_SIZE.Y - h.Position.Y));
-            slider.NestedHitObjects.OfType<SliderRepeat>().ForEach(h => h.Position = new Vector2(h.Position.X, OsuPlayfield.BASE_SIZE.Y - h.Position.Y));
-
-            var controlPoints = slider.Path.ControlPoints.Select(p => new PathControlPoint(p.Position.Value, p.Type.Value)).ToArray();
-            foreach (var point in controlPoints)
-                point.Position.Value = new Vector2(point.Position.Value.X, -point.Position.Value.Y);
-
-            slider.Path = new SliderPath(controlPoints, slider.Path.ExpectedDistance.Value);
+            OsuHitObjectGenerationUtils.ReflectVertically(osuObject);
         }
     }
 }

osu.Game.Rulesets.Osu/Mods/OsuModMirror.cs

@@ -0,0 +1,50 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Framework.Bindables;
+using osu.Game.Configuration;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Utils;
+
+namespace osu.Game.Rulesets.Osu.Mods
+{
+    public class OsuModMirror : ModMirror, IApplicableToHitObject
+    {
+        public override string Description => "Flip objects on the chosen axes.";
+        public override Type[] IncompatibleMods => new[] { typeof(ModHardRock) };
+
+        [SettingSource("Mirrored axes", "Choose which axes objects are mirrored over.")]
+        public Bindable<MirrorType> Reflection { get; } = new Bindable<MirrorType>();
+
+        public void ApplyToHitObject(HitObject hitObject)
+        {
+            var osuObject = (OsuHitObject)hitObject;
+
+            switch (Reflection.Value)
+            {
+                case MirrorType.Horizontal:
+                    OsuHitObjectGenerationUtils.ReflectHorizontally(osuObject);
+                    break;
+
+                case MirrorType.Vertical:
+                    OsuHitObjectGenerationUtils.ReflectVertically(osuObject);
+                    break;
+
+                case MirrorType.Both:
+                    OsuHitObjectGenerationUtils.ReflectHorizontally(osuObject);
+                    OsuHitObjectGenerationUtils.ReflectVertically(osuObject);
+                    break;
+            }
+        }
+
+        public enum MirrorType
+        {
+            Horizontal,
+            Vertical,
+            Both
+        }
+    }
+}

osu.Game.Rulesets.Osu/Mods/OsuModMuted.cs

@@ -0,0 +1,12 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Osu.Objects;
+
+namespace osu.Game.Rulesets.Osu.Mods
+{
+    public class OsuModMuted : ModMuted<OsuHitObject>
+    {
+    }
+}

osu.Game.Rulesets.Osu/Mods/OsuModRandom.cs

@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using osu.Framework.Graphics;
+using osu.Framework.Graphics.Primitives;
 using osu.Framework.Utils;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Mods;
@@ -26,6 +26,11 @@ namespace osu.Game.Rulesets.Osu.Mods
 
         private static readonly float playfield_diagonal = OsuPlayfield.BASE_SIZE.LengthFast;
 
+        /// <summary>
+        /// Number of previous hitobjects to be shifted together when another object is being moved.
+        /// </summary>
+        private const int preceding_hitobjects_to_shift = 10;
+
         private Random rng;
 
         public void ApplyToBeatmap(IBeatmap beatmap)
@@ -49,8 +54,9 @@ namespace osu.Game.Rulesets.Osu.Mods
 
                 var current = new RandomObjectInfo(hitObject);
 
-                // rateOfChangeMultiplier only changes every i iterations to prevent shaky-line-shaped streams
-                if (i % 3 == 0)
+                // rateOfChangeMultiplier only changes every 5 iterations in a combo
+                // to prevent shaky-line-shaped streams
+                if (hitObject.IndexInCurrentCombo % 5 == 0)
                     rateOfChangeMultiplier = (float)rng.NextDouble() * 2 - 1;
 
                 if (hitObject is Spinner)
@@ -61,13 +67,35 @@ namespace osu.Game.Rulesets.Osu.Mods
 
                 applyRandomisation(rateOfChangeMultiplier, previous, current);
 
-                hitObject.Position = current.PositionRandomised;
+                // Move hit objects back into the playfield if they are outside of it
+                Vector2 shift = Vector2.Zero;
 
-                // update end position as it may have changed as a result of the position update.
-                current.EndPositionRandomised = current.PositionRandomised;
+                switch (hitObject)
+                {
+                    case HitCircle circle:
+                        shift = clampHitCircleToPlayfield(circle, current);
+                        break;
 
-                if (hitObject is Slider slider)
-                    moveSliderIntoPlayfield(slider, current);
+                    case Slider slider:
+                        shift = clampSliderToPlayfield(slider, current);
+                        break;
+                }
+
+                if (shift != Vector2.Zero)
+                {
+                    var toBeShifted = new List<OsuHitObject>();
+
+                    for (int j = i - 1; j >= i - preceding_hitobjects_to_shift && j >= 0; j--)
+                    {
+                        // only shift hit circles
+                        if (!(hitObjects[j] is HitCircle)) break;
+
+                        toBeShifted.Add(hitObjects[j]);
+                    }
+
+                    if (toBeShifted.Count > 0)
+                        applyDecreasingShift(toBeShifted, shift);
+                }
 
                 previous = current;
             }
@@ -94,7 +122,9 @@ namespace osu.Game.Rulesets.Osu.Mods
             // The max. angle (relative to the angle of the vector pointing from the 2nd last to the last hit object)
             // is proportional to the distance between the last and the current hit object
             // to allow jumps and prevent too sharp turns during streams.
-            var randomAngleRad = rateOfChangeMultiplier * 2 * Math.PI * distanceToPrev / playfield_diagonal;
+
+            // Allow maximum jump angle when jump distance is more than half of playfield diagonal length
+            var randomAngleRad = rateOfChangeMultiplier * 2 * Math.PI * Math.Min(1f, distanceToPrev / (playfield_diagonal * 0.5f));
 
             current.AngleRad = (float)randomAngleRad + previous.AngleRad;
             if (current.AngleRad < 0)
@@ -109,56 +139,120 @@ namespace osu.Game.Rulesets.Osu.Mods
 
             current.AngleRad = (float)Math.Atan2(posRelativeToPrev.Y, posRelativeToPrev.X);
 
-            var position = previous.EndPositionRandomised + posRelativeToPrev;
+            current.PositionRandomised = previous.EndPositionRandomised + posRelativeToPrev;
+        }
 
-            // Move hit objects back into the playfield if they are outside of it,
-            // which would sometimes happen during big jumps otherwise.
-            position.X = MathHelper.Clamp(position.X, 0, OsuPlayfield.BASE_SIZE.X);
-            position.Y = MathHelper.Clamp(position.Y, 0, OsuPlayfield.BASE_SIZE.Y);
+        /// <summary>
+        /// Move the randomised position of a hit circle so that it fits inside the playfield.
+        /// </summary>
+        /// <returns>The deviation from the original randomised position in order to fit within the playfield.</returns>
+        private Vector2 clampHitCircleToPlayfield(HitCircle circle, RandomObjectInfo objectInfo)
+        {
+            var previousPosition = objectInfo.PositionRandomised;
+            objectInfo.EndPositionRandomised = objectInfo.PositionRandomised = clampToPlayfieldWithPadding(
+                objectInfo.PositionRandomised,
+                (float)circle.Radius
+            );
 
-            current.PositionRandomised = position;
+            circle.Position = objectInfo.PositionRandomised;
+
+            return objectInfo.PositionRandomised - previousPosition;
         }
 
         /// <summary>
         /// Moves the <see cref="Slider"/> and all necessary nested <see cref="OsuHitObject"/>s into the <see cref="OsuPlayfield"/> if they aren't already.
         /// </summary>
-        private void moveSliderIntoPlayfield(Slider slider, RandomObjectInfo currentObjectInfo)
+        /// <returns>The deviation from the original randomised position in order to fit within the playfield.</returns>
+        private Vector2 clampSliderToPlayfield(Slider slider, RandomObjectInfo objectInfo)
         {
-            var minMargin = getMinSliderMargin(slider);
+            var possibleMovementBounds = calculatePossibleMovementBounds(slider);
 
-            slider.Position = new Vector2(
-                Math.Clamp(slider.Position.X, minMargin.Left, OsuPlayfield.BASE_SIZE.X - minMargin.Right),
-                Math.Clamp(slider.Position.Y, minMargin.Top, OsuPlayfield.BASE_SIZE.Y - minMargin.Bottom)
-            );
+            var previousPosition = objectInfo.PositionRandomised;
 
-            currentObjectInfo.PositionRandomised = slider.Position;
-            currentObjectInfo.EndPositionRandomised = slider.EndPosition;
+            // Clamp slider position to the placement area
+            // If the slider is larger than the playfield, force it to stay at the original position
+            var newX = possibleMovementBounds.Width < 0
+                ? objectInfo.PositionOriginal.X
+                : Math.Clamp(previousPosition.X, possibleMovementBounds.Left, possibleMovementBounds.Right);
 
-            shiftNestedObjects(slider, currentObjectInfo.PositionRandomised - currentObjectInfo.PositionOriginal);
+            var newY = possibleMovementBounds.Height < 0
+                ? objectInfo.PositionOriginal.Y
+                : Math.Clamp(previousPosition.Y, possibleMovementBounds.Top, possibleMovementBounds.Bottom);
+
+            slider.Position = objectInfo.PositionRandomised = new Vector2(newX, newY);
+            objectInfo.EndPositionRandomised = slider.EndPosition;
+
+            shiftNestedObjects(slider, objectInfo.PositionRandomised - objectInfo.PositionOriginal);
+
+            return objectInfo.PositionRandomised - previousPosition;
         }
 
         /// <summary>
-        /// Calculates the min. distances from the <see cref="Slider"/>'s position to the playfield border for the slider to be fully inside of the playfield.
+        /// Decreasingly shift a list of <see cref="OsuHitObject"/>s by a specified amount.
+        /// The first item in the list is shifted by the largest amount, while the last item is shifted by the smallest amount.
         /// </summary>
-        private MarginPadding getMinSliderMargin(Slider slider)
+        /// <param name="hitObjects">The list of hit objects to be shifted.</param>
+        /// <param name="shift">The amount to be shifted.</param>
+        private void applyDecreasingShift(IList<OsuHitObject> hitObjects, Vector2 shift)
+        {
+            for (int i = 0; i < hitObjects.Count; i++)
+            {
+                var hitObject = hitObjects[i];
+                // The first object is shifted by a vector slightly smaller than shift
+                // The last object is shifted by a vector slightly larger than zero
+                Vector2 position = hitObject.Position + shift * ((hitObjects.Count - i) / (float)(hitObjects.Count + 1));
+
+                hitObject.Position = clampToPlayfieldWithPadding(position, (float)hitObject.Radius);
+            }
+        }
+
+        /// <summary>
+        /// Calculates a <see cref="RectangleF"/> which contains all of the possible movements of the slider (in relative X/Y coordinates)
+        /// such that the entire slider is inside the playfield.
+        /// </summary>
+        /// <remarks>
+        /// If the slider is larger than the playfield, the returned <see cref="RectangleF"/> may have negative width/height.
+        /// </remarks>
+        private RectangleF calculatePossibleMovementBounds(Slider slider)
         {
             var pathPositions = new List<Vector2>();
             slider.Path.GetPathToProgress(pathPositions, 0, 1);
 
-            var minMargin = new MarginPadding();
+            float minX = float.PositiveInfinity;
+            float maxX = float.NegativeInfinity;
 
+            float minY = float.PositiveInfinity;
+            float maxY = float.NegativeInfinity;
+
+            // Compute the bounding box of the slider.
             foreach (var pos in pathPositions)
             {
-                minMargin.Left = Math.Max(minMargin.Left, -pos.X);
-                minMargin.Right = Math.Max(minMargin.Right, pos.X);
-                minMargin.Top = Math.Max(minMargin.Top, -pos.Y);
-                minMargin.Bottom = Math.Max(minMargin.Bottom, pos.Y);
+                minX = MathF.Min(minX, pos.X);
+                maxX = MathF.Max(maxX, pos.X);
+
+                minY = MathF.Min(minY, pos.Y);
+                maxY = MathF.Max(maxY, pos.Y);
             }
 
-            minMargin.Left = Math.Min(minMargin.Left, OsuPlayfield.BASE_SIZE.X - minMargin.Right);
-            minMargin.Top = Math.Min(minMargin.Top, OsuPlayfield.BASE_SIZE.Y - minMargin.Bottom);
+            // Take the circle radius into account.
+            var radius = (float)slider.Radius;
 
-            return minMargin;
+            minX -= radius;
+            minY -= radius;
+
+            maxX += radius;
+            maxY += radius;
+
+            // Given the bounding box of the slider (via min/max X/Y),
+            // the amount that the slider can move to the left is minX (with the sign flipped, since positive X is to the right),
+            // and the amount that it can move to the right is WIDTH - maxX.
+            // Same calculation applies for the Y axis.
+            float left = -minX;
+            float right = OsuPlayfield.BASE_SIZE.X - maxX;
+            float top = -minY;
+            float bottom = OsuPlayfield.BASE_SIZE.Y - maxY;
+
+            return new RectangleF(left, top, right - left, bottom - top);
         }
 
         /// <summary>
@@ -177,6 +271,20 @@ namespace osu.Game.Rulesets.Osu.Mods
             }
         }
 
+        /// <summary>
+        /// Clamp a position to playfield, keeping a specified distance from the edges.
+        /// </summary>
+        /// <param name="position">The position to be clamped.</param>
+        /// <param name="padding">The minimum distance allowed from playfield edges.</param>
+        /// <returns>The clamped position.</returns>
+        private Vector2 clampToPlayfieldWithPadding(Vector2 position, float padding)
+        {
+            return new Vector2(
+                Math.Clamp(position.X, padding, OsuPlayfield.BASE_SIZE.X - padding),
+                Math.Clamp(position.Y, padding, OsuPlayfield.BASE_SIZE.Y - padding)
+            );
+        }
+
         private class RandomObjectInfo
         {
             public float AngleRad { get; set; }

osu.Game.Rulesets.Osu/Mods/OsuModSpinIn.cs

@@ -44,7 +44,7 @@ namespace osu.Game.Rulesets.Osu.Mods
             switch (drawable)
             {
                 case DrawableHitCircle circle:
-                    using (circle.BeginAbsoluteSequence(h.StartTime - h.TimePreempt, true))
+                    using (circle.BeginAbsoluteSequence(h.StartTime - h.TimePreempt))
                     {
                         circle.ApproachCircle.Hide();