Add cursor trail test scene

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

@@ -0,0 +1,120 @@
+// 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 NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Audio.Sample;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Textures;
+using osu.Framework.Testing.Input;
+using osu.Game.Audio;
+using osu.Game.Rulesets.Osu.Skinning;
+using osu.Game.Rulesets.Osu.UI.Cursor;
+using osu.Game.Skinning;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    public class TestSceneCursorTrail : OsuTestScene
+    {
+        [Test]
+        public void TestSmoothCursorTrail()
+        {
+            createTest(() => new CursorTrail());
+        }
+
+        [Test]
+        public void TestLegacySmoothCursorTrail()
+        {
+            createTest(() => new LegacySkinContainer(false)
+            {
+                Child = new LegacyCursorTrail()
+            });
+        }
+
+        [Test]
+        public void TestLegacyDisjointCursorTrail()
+        {
+            createTest(() => new LegacySkinContainer(true)
+            {
+                Child = new LegacyCursorTrail()
+            });
+        }
+
+        private void createTest(Func<Drawable> createContent) => AddStep("create trail", () =>
+        {
+            Clear();
+
+            Add(new Container
+            {
+                RelativeSizeAxes = Axes.Both,
+                Size = new Vector2(0.8f),
+                Child = new MovingCursorInputManager { Child = createContent?.Invoke() }
+            });
+        });
+
+        [Cached(typeof(ISkinSource))]
+        private class LegacySkinContainer : Container, ISkinSource
+        {
+            private readonly bool disjoint;
+
+            public LegacySkinContainer(bool disjoint)
+            {
+                this.disjoint = disjoint;
+
+                RelativeSizeAxes = Axes.Both;
+            }
+
+            public Drawable GetDrawableComponent(ISkinComponent component) => throw new NotImplementedException();
+
+            public Texture GetTexture(string componentName)
+            {
+                switch (componentName)
+                {
+                    case "cursortrail":
+                        var tex = new Texture(Texture.WhitePixel.TextureGL);
+
+                        if (disjoint)
+                            tex.ScaleAdjust = 1 / 25f;
+                        return tex;
+
+                    case "cursormiddle":
+                        return disjoint ? null : Texture.WhitePixel;
+                }
+
+                return null;
+            }
+
+            public SampleChannel GetSample(ISampleInfo sampleInfo) => throw new NotImplementedException();
+
+            public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup) => throw new NotImplementedException();
+
+            public event Action SourceChanged;
+        }
+
+        private class MovingCursorInputManager : ManualInputManager
+        {
+            public MovingCursorInputManager()
+            {
+                UseParentInput = false;
+            }
+
+            protected override void Update()
+            {
+                base.Update();
+
+                const double spin_duration = 1000;
+                double currentTime = Time.Current;
+
+                double angle = (currentTime % spin_duration) / spin_duration * 2 * Math.PI;
+                Vector2 rPos = new Vector2((float)Math.Cos(angle), (float)Math.Sin(angle));
+
+                MoveMouseTo(ToScreenSpace(DrawSize / 2 + DrawSize / 3 * rPos));
+            }
+        }
+    }
+}