Implement initial slider placement (linear)

osu.Game.Rulesets.Osu/Edit/Masks/SliderPlacementMask.cs

@@ -0,0 +1,99 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Collections.Generic;
+using System.Drawing.Imaging;
+using System.Linq;
+using osu.Framework.Graphics;
+using osu.Framework.Input.Events;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Objects;
+using OpenTK;
+
+namespace osu.Game.Rulesets.Osu.Edit.Masks
+{
+    public partial class SliderPlacementMask : PlacementMask
+    {
+        public new Slider HitObject => (Slider)base.HitObject;
+
+        private readonly CirclePlacementMask headMask;
+        private readonly CirclePlacementMask tailMask;
+
+        private readonly List<Vector2> controlPoints = new List<Vector2>();
+
+        private PlacementState state = PlacementState.Head;
+
+        public SliderPlacementMask()
+            : base(new Slider())
+        {
+            RelativeSizeAxes = Axes.Both;
+
+            InternalChildren = new Drawable[]
+            {
+                headMask = new CirclePlacementMask(),
+                tailMask = new CirclePlacementMask(),
+            };
+
+            setState(PlacementState.Head);
+        }
+
+        protected override bool OnMouseMove(MouseMoveEvent e)
+        {
+            switch (state)
+            {
+                case PlacementState.Head:
+                    headMask.Position = e.MousePosition;
+                    return true;
+                case PlacementState.Tail:
+                    tailMask.Position = ToLocalSpace(e.ScreenSpaceMousePosition);
+                    return true;
+            }
+
+            return false;
+        }
+
+        protected override bool OnClick(ClickEvent e)
+        {
+            switch (state)
+            {
+                case PlacementState.Head:
+                    setState(PlacementState.Tail);
+                    controlPoints.Add(Vector2.Zero);
+                    break;
+                case PlacementState.Tail:
+                    controlPoints.Add(tailMask.Position - headMask.Position);
+                    HitObject.Position = headMask.Position;
+                    HitObject.ControlPoints = controlPoints.ToList();
+                    HitObject.CurveType = CurveType.Linear;
+                    HitObject.Distance = Vector2.Distance(controlPoints.First(), controlPoints.Last());
+                    Finish();
+                    break;
+            }
+
+            return base.OnClick(e);
+        }
+
+        private void setState(PlacementState newState)
+        {
+            switch (newState)
+            {
+                case PlacementState.Head:
+                    tailMask.Alpha = 0;
+                    break;
+                case PlacementState.Tail:
+                    tailMask.Alpha = 1;
+                    break;
+            }
+
+            state = newState;
+        }
+
+        private enum PlacementState
+        {
+            Head,
+            Body,
+            Tail
+        }
+    }
+}

osu.Game.Rulesets.Osu/Edit/Masks/SliderPlacementMask_CirclePlacementMask.cs

@@ -0,0 +1,29 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Graphics;
+using osu.Framework.Input.Events;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Osu.Objects;
+
+namespace osu.Game.Rulesets.Osu.Edit.Masks
+{
+    public partial class SliderPlacementMask
+    {
+        private class CirclePlacementMask : PlacementMask
+        {
+            public new HitCircle HitObject => (HitCircle)base.HitObject;
+
+            public CirclePlacementMask()
+                : base(new HitCircle())
+            {
+                Origin = Anchor.Centre;
+                AutoSizeAxes = Axes.Both;
+
+                InternalChild = new HitCircleMask(HitObject);
+            }
+
+            protected override bool Handle(UIEvent e) => false;
+        }
+    }
+}

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

@@ -27,9 +27,10 @@ namespace osu.Game.Rulesets.Osu.Edit
         protected override RulesetContainer<OsuHitObject> CreateRulesetContainer(Ruleset ruleset, WorkingBeatmap beatmap)
             => new OsuEditRulesetContainer(ruleset, beatmap);
 
-        protected override IReadOnlyList<HitObjectCompositionTool> CompositionTools => new[]
+        protected override IReadOnlyList<HitObjectCompositionTool> CompositionTools => new HitObjectCompositionTool[]
         {
             new HitCircleCompositionTool(),
+            new SliderCompositionTool(),
         };
 
         protected override Container CreateLayerContainer() => new PlayfieldAdjustmentContainer { RelativeSizeAxes = Axes.Both };

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

@@ -0,0 +1,20 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Tools;
+using osu.Game.Rulesets.Osu.Edit.Masks;
+using osu.Game.Rulesets.Osu.Objects;
+
+namespace osu.Game.Rulesets.Osu.Edit
+{
+    public class SliderCompositionTool : HitObjectCompositionTool
+    {
+        public SliderCompositionTool()
+            : base(nameof(Slider))
+        {
+        }
+
+        public override PlacementMask CreatePlacementMask() => new SliderPlacementMask();
+    }
+}

osu.Game.Tests/Visual/TestCaseHitObjectComposer.cs

@@ -38,6 +38,7 @@ namespace osu.Game.Tests.Visual
             typeof(HitCircleSelectionMask),
             typeof(HitCirclePlacementMask),
             typeof(SliderSelectionMask),
+            typeof(SliderPlacementMask)
         };
 
         private HitObjectComposer composer;