Merge pull request #12410 from peppy/mod-barrel-roll

Add "Barrel Roll" mod

osu.Game.Rulesets.Osu/Mods/OsuModBarrelRoll.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 osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Configuration;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.UI;
+using osu.Game.Rulesets.UI;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Mods
+{
+    public class OsuModBarrelRoll : Mod, IUpdatableByPlayfield, IApplicableToDrawableRuleset<OsuHitObject>
+    {
+        [SettingSource("Roll speed", "Rotations per minute")]
+        public BindableNumber<double> SpinSpeed { get; } = new BindableDouble(0.5)
+        {
+            MinValue = 0.02,
+            MaxValue = 4,
+            Precision = 0.01,
+        };
+
+        [SettingSource("Direction", "The direction of rotation")]
+        public Bindable<RotationDirection> Direction { get; } = new Bindable<RotationDirection>(RotationDirection.Clockwise);
+
+        public override string Name => "Barrel Roll";
+        public override string Acronym => "BR";
+        public override string Description => "The whole playfield is on a wheel!";
+        public override double ScoreMultiplier => 1;
+
+        public void Update(Playfield playfield)
+        {
+            playfield.Rotation = (Direction.Value == RotationDirection.CounterClockwise ? -1 : 1) * 360 * (float)(playfield.Time.Current / 60000 * SpinSpeed.Value);
+        }
+
+        public void ApplyToDrawableRuleset(DrawableRuleset<OsuHitObject> drawableRuleset)
+        {
+            // scale the playfield to allow all hitobjects to stay within the visible region.
+            drawableRuleset.Playfield.Scale = new Vector2(OsuPlayfield.BASE_SIZE.Y / OsuPlayfield.BASE_SIZE.X);
+        }
+    }
+}

osu.Game.Rulesets.Osu/OsuRuleset.cs

@@ -185,6 +185,7 @@ namespace osu.Game.Rulesets.Osu
                         new MultiMod(new OsuModGrow(), new OsuModDeflate()),
                         new MultiMod(new ModWindUp(), new ModWindDown()),
                         new OsuModTraceable(),
+                        new OsuModBarrelRoll(),
                     };
 
                 case ModType.System:

osu.Game.Rulesets.Osu/UI/OsuPlayfield.cs

@@ -42,6 +42,9 @@ namespace osu.Game.Rulesets.Osu.UI
 
         public OsuPlayfield()
         {
+            Anchor = Anchor.Centre;
+            Origin = Anchor.Centre;
+
             InternalChildren = new Drawable[]
             {
                 playfieldBorder = new PlayfieldBorder { RelativeSizeAxes = Axes.Both },