Remove abstract from ParticleSpewer

osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyCursorParticles.cs

@@ -1,11 +1,11 @@
 // 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.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Textures;
 using osu.Framework.Input;
 using osu.Framework.Input.Bindings;
 using osu.Framework.Input.Events;
@@ -20,12 +20,17 @@ using osuTK.Graphics;
 
 namespace osu.Game.Rulesets.Osu.Skinning.Legacy
 {
-    public class LegacyCursorParticles : CompositeDrawable, IKeyBindingHandler<OsuAction>
+    public class LegacyCursorParticles : CompositeDrawable, IKeyBindingHandler<OsuAction>, IRequireHighFrequencyMousePosition
     {
+        private const int particle_lifetime_min = 300;
+        private const int particle_lifetime_max = 1000;
+        private const float particle_gravity = 240;
+
         public bool Active => breakSpewer?.Active.Value == true || kiaiSpewer?.Active.Value == true;
 
-        private LegacyCursorParticleSpewer breakSpewer;
-        private LegacyCursorParticleSpewer kiaiSpewer;
+        private Vector2 cursorVelocity;
+        private ParticleSpewer breakSpewer;
+        private ParticleSpewer kiaiSpewer;
 
         [Resolved(canBeNull: true)]
         private Player player { get; set; }
@@ -45,21 +50,25 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
                 texture.ScaleAdjust *= 1.6f;
             }
 
+            RelativeSizeAxes = Axes.Both;
+            Anchor = Anchor.Centre;
             InternalChildren = new[]
             {
-                breakSpewer = new LegacyCursorParticleSpewer(texture, 20)
+                breakSpewer = new ParticleSpewer(texture, 20, particle_lifetime_max)
                 {
-                    Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre,
+                    RelativeSizeAxes = Axes.Both,
+                    Size = Vector2.One,
                     Colour = starBreakAdditive,
-                    Direction = SpewDirection.None,
+                    ParticleGravity = particle_gravity,
+                    CreateParticle = createBreakParticle,
                 },
-                kiaiSpewer = new LegacyCursorParticleSpewer(texture, 60)
+                kiaiSpewer = new ParticleSpewer(texture, 60, particle_lifetime_max)
                 {
-                    Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre,
+                    RelativeSizeAxes = Axes.Both,
+                    Size = Vector2.One,
                     Colour = starBreakAdditive,
-                    Direction = SpewDirection.None,
+                    ParticleGravity = particle_gravity,
+                    CreateParticle = createParticle,
                 },
             };
 
@@ -85,6 +94,39 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
             kiaiSpewer.Active.Value = kiaiHitObject != null;
         }
 
+        private Vector2? cursorScreenPosition;
+
+        private const double max_velocity_frame_length = 15;
+        private double velocityFrameLength;
+        private Vector2 totalPosDifference;
+
+        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => true;
+
+        protected override bool OnMouseMove(MouseMoveEvent e)
+        {
+            if (cursorScreenPosition == null)
+            {
+                cursorScreenPosition = e.ScreenSpaceMousePosition;
+                return base.OnMouseMove(e);
+            }
+
+            // calculate cursor velocity.
+            totalPosDifference += e.ScreenSpaceMousePosition - cursorScreenPosition.Value;
+            cursorScreenPosition = e.ScreenSpaceMousePosition;
+
+            velocityFrameLength += Math.Abs(Clock.ElapsedFrameTime);
+
+            if (velocityFrameLength > max_velocity_frame_length)
+            {
+                cursorVelocity = totalPosDifference / (float)velocityFrameLength;
+
+                totalPosDifference = Vector2.Zero;
+                velocityFrameLength = 0;
+            }
+
+            return base.OnMouseMove(e);
+        }
+
         public bool OnPressed(OsuAction action)
         {
             handleInput(action, true);
@@ -111,125 +153,53 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
                     rightPressed = pressed;
                     break;
             }
+        }
+
+        private ParticleSpewer.FallingParticle? createParticle()
+        {
+            if (!cursorScreenPosition.HasValue) return null;
+
+            return new ParticleSpewer.FallingParticle
+            {
+                StartPosition = ToLocalSpace(cursorScreenPosition.Value),
+                Duration = RNG.NextSingle(particle_lifetime_min, particle_lifetime_max),
+                StartAngle = (float)(RNG.NextDouble() * 4 - 2),
+                EndAngle = RNG.NextSingle(-2f, 2f),
+                EndScale = RNG.NextSingle(2f),
+                Velocity = cursorVelocity * 40,
+            };
+        }
+
+        private ParticleSpewer.FallingParticle? createBreakParticle()
+        {
+            var baseParticle = createParticle();
+            if (!baseParticle.HasValue) return null;
+
+            var p = baseParticle.Value;
 
             if (leftPressed && rightPressed)
-                breakSpewer.Direction = SpewDirection.Omni;
+            {
+                p.Velocity += new Vector2(
+                    RNG.NextSingle(-460f, 460f),
+                    RNG.NextSingle(-160f, 160f)
+                );
+            }
             else if (leftPressed)
-                breakSpewer.Direction = SpewDirection.Left;
+            {
+                p.Velocity += new Vector2(
+                    RNG.NextSingle(-460f, 0),
+                    RNG.NextSingle(-40f, 40f)
+                );
+            }
             else if (rightPressed)
-                breakSpewer.Direction = SpewDirection.Right;
-            else
-                breakSpewer.Direction = SpewDirection.None;
-        }
-
-        private class LegacyCursorParticleSpewer : ParticleSpewer, IRequireHighFrequencyMousePosition
-        {
-            private const int particle_lifetime_min = 300;
-            private const int particle_lifetime_max = 1000;
-
-            public SpewDirection Direction { get; set; }
-
-            protected override bool CanSpawnParticles => base.CanSpawnParticles && cursorScreenPosition.HasValue;
-            protected override float ParticleGravity => 240;
-
-            public LegacyCursorParticleSpewer(Texture texture, int perSecond)
-                : base(texture, perSecond, particle_lifetime_max)
             {
-                Active.BindValueChanged(_ => resetVelocityCalculation());
+                p.Velocity += new Vector2(
+                    RNG.NextSingle(0, 460f),
+                    RNG.NextSingle(-40f, 40f)
+                );
             }
 
-            private Vector2? cursorScreenPosition;
-            private Vector2 cursorVelocity;
-
-            private const double max_velocity_frame_length = 15;
-            private double velocityFrameLength;
-            private Vector2 totalPosDifference;
-
-            public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => true;
-
-            protected override bool OnMouseMove(MouseMoveEvent e)
-            {
-                if (cursorScreenPosition == null)
-                {
-                    cursorScreenPosition = e.ScreenSpaceMousePosition;
-                    return base.OnMouseMove(e);
-                }
-
-                // calculate cursor velocity.
-                totalPosDifference += e.ScreenSpaceMousePosition - cursorScreenPosition.Value;
-                cursorScreenPosition = e.ScreenSpaceMousePosition;
-
-                velocityFrameLength += Clock.ElapsedFrameTime;
-
-                if (velocityFrameLength > max_velocity_frame_length)
-                {
-                    cursorVelocity = totalPosDifference / (float)velocityFrameLength;
-
-                    totalPosDifference = Vector2.Zero;
-                    velocityFrameLength = 0;
-                }
-
-                return base.OnMouseMove(e);
-            }
-
-            private void resetVelocityCalculation()
-            {
-                cursorScreenPosition = null;
-                totalPosDifference = Vector2.Zero;
-                velocityFrameLength = 0;
-            }
-
-            protected override FallingParticle CreateParticle() =>
-                new FallingParticle
-                {
-                    StartPosition = ToLocalSpace(cursorScreenPosition ?? Vector2.Zero),
-                    Duration = RNG.NextSingle(particle_lifetime_min, particle_lifetime_max),
-                    StartAngle = (float)(RNG.NextDouble() * 4 - 2),
-                    EndAngle = RNG.NextSingle(-2f, 2f),
-                    EndScale = RNG.NextSingle(2f),
-                    Velocity = getVelocity(),
-                };
-
-            private Vector2 getVelocity()
-            {
-                Vector2 velocity = Vector2.Zero;
-
-                switch (Direction)
-                {
-                    case SpewDirection.Left:
-                        velocity = new Vector2(
-                            RNG.NextSingle(-460f, 0),
-                            RNG.NextSingle(-40f, 40f)
-                        );
-                        break;
-
-                    case SpewDirection.Right:
-                        velocity = new Vector2(
-                            RNG.NextSingle(0, 460f),
-                            RNG.NextSingle(-40f, 40f)
-                        );
-                        break;
-
-                    case SpewDirection.Omni:
-                        velocity = new Vector2(
-                            RNG.NextSingle(-460f, 460f),
-                            RNG.NextSingle(-160f, 160f)
-                        );
-                        break;
-                }
-
-                velocity += cursorVelocity * 40;
-
-                return velocity;
-            }
-        }
-
-        private enum SpewDirection
-        {
-            None,
-            Left,
-            Right,
-            Omni,
+            return p;
         }
     }
 }

osu.Game.Tests/Visual/Gameplay/TestSceneParticleSpewer.cs

@@ -5,7 +5,6 @@ using System;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Textures;
 using osu.Framework.Testing;
 using osu.Framework.Utils;
 using osu.Game.Graphics;
@@ -17,7 +16,12 @@ namespace osu.Game.Tests.Visual.Gameplay
     [TestFixture]
     public class TestSceneParticleSpewer : OsuTestScene
     {
-        private TestParticleSpewer spewer;
+        private const int max_particle_duration = 1500;
+
+        private float particleMaxVelocity = 0.5f;
+        private Vector2 particleSpawnPosition = new Vector2(0.5f);
+
+        private ParticleSpewer spewer;
 
         [Resolved]
         private SkinManager skinManager { get; set; }
@@ -28,11 +32,11 @@ namespace osu.Game.Tests.Visual.Gameplay
             Child = spewer = createSpewer();
 
             AddToggleStep("toggle spawning", value => spewer.Active.Value = value);
-            AddSliderStep("particle gravity", 0f, 1f, 0f, value => spewer.Gravity = value);
-            AddSliderStep("particle velocity", 0f, 1f, 0.5f, value => spewer.MaxVelocity = value);
+            AddSliderStep("particle velocity", 0f, 1f, 0.5f, value => particleMaxVelocity = value);
+            AddSliderStep("particle gravity", 0f, 1f, 0f, value => spewer.ParticleGravity = value);
             AddStep("move to new location", () =>
             {
-                spewer.TransformTo(nameof(spewer.SpawnPosition), new Vector2(RNG.NextSingle(), RNG.NextSingle()), 1000, Easing.Out);
+                this.TransformTo(nameof(particleSpawnPosition), new Vector2(RNG.NextSingle(), RNG.NextSingle()), 1000, Easing.Out);
             });
         }
 
@@ -55,47 +59,29 @@ namespace osu.Game.Tests.Visual.Gameplay
             AddAssert("is not present", () => !spewer.IsPresent);
         }
 
-        private TestParticleSpewer createSpewer() =>
-            new TestParticleSpewer(skinManager.DefaultLegacySkin.GetTexture("star2"))
+        private ParticleSpewer createSpewer() =>
+            new ParticleSpewer(skinManager.DefaultLegacySkin.GetTexture("star2"), 1500, max_particle_duration)
             {
                 Origin = Anchor.Centre,
                 RelativePositionAxes = Axes.Both,
                 RelativeSizeAxes = Axes.Both,
                 Position = new Vector2(0.5f),
                 Size = new Vector2(0.5f),
+                CreateParticle = createParticle,
             };
 
-        private class TestParticleSpewer : ParticleSpewer
-        {
-            private const int lifetime = 1500;
-            private const int rate = 250;
-
-            public float Gravity;
-
-            public float MaxVelocity = 0.25f;
-
-            public Vector2 SpawnPosition { get; set; } = new Vector2(0.5f);
-
-            protected override float ParticleGravity => Gravity;
-
-            public TestParticleSpewer(Texture texture)
-                : base(texture, rate, lifetime)
+        private ParticleSpewer.FallingParticle? createParticle() =>
+            new ParticleSpewer.FallingParticle
             {
-            }
-
-            protected override FallingParticle CreateParticle() =>
-                new FallingParticle
-                {
-                    Velocity = new Vector2(
-                        RNG.NextSingle(-MaxVelocity, MaxVelocity),
-                        RNG.NextSingle(-MaxVelocity, MaxVelocity)
-                    ),
-                    StartPosition = SpawnPosition,
-                    Duration = RNG.NextSingle(lifetime),
-                    StartAngle = RNG.NextSingle(MathF.PI * 2),
-                    EndAngle = RNG.NextSingle(MathF.PI * 2),
-                    EndScale = RNG.NextSingle(0.5f, 1.5f)
-                };
-        }
+                Velocity = new Vector2(
+                    RNG.NextSingle(-particleMaxVelocity, particleMaxVelocity),
+                    RNG.NextSingle(-particleMaxVelocity, particleMaxVelocity)
+                ),
+                StartPosition = particleSpawnPosition,
+                Duration = RNG.NextSingle(max_particle_duration),
+                StartAngle = RNG.NextSingle(MathF.PI * 2),
+                EndAngle = RNG.NextSingle(MathF.PI * 2),
+                EndScale = RNG.NextSingle(0.5f, 1.5f)
+            };
     }
 }

osu.Game/Graphics/ParticleSpewer.cs

@@ -13,14 +13,14 @@ using osuTK;
 
 namespace osu.Game.Graphics
 {
-    public abstract class ParticleSpewer : Sprite
+    public class ParticleSpewer : Sprite
     {
         private readonly FallingParticle[] particles;
         private int currentIndex;
         private double lastParticleAdded;
 
         private readonly double cooldown;
-        private readonly double maxLifetime;
+        private readonly double maxDuration;
 
         /// <summary>
         /// Determines whether particles are being spawned.
@@ -29,20 +29,24 @@ namespace osu.Game.Graphics
 
         public override bool IsPresent => base.IsPresent && hasActiveParticles;
 
-        protected virtual bool CanSpawnParticles => true;
-        protected virtual float ParticleGravity => 0;
+        /// <summary>
+        /// Called each time a new particle should be spawned.
+        /// </summary>
+        public Func<FallingParticle?> CreateParticle = () => new FallingParticle();
 
-        private bool hasActiveParticles => Active.Value || (lastParticleAdded + maxLifetime) > Time.Current;
+        public float ParticleGravity;
 
-        protected ParticleSpewer(Texture texture, int perSecond, double maxLifetime)
+        private bool hasActiveParticles => Active.Value || (lastParticleAdded + maxDuration) > Time.Current;
+
+        public ParticleSpewer(Texture texture, int perSecond, double maxDuration)
         {
             Texture = texture;
             Blending = BlendingParameters.Additive;
 
-            particles = new FallingParticle[perSecond * (int)Math.Ceiling(maxLifetime / 1000)];
+            particles = new FallingParticle[perSecond * (int)Math.Ceiling(maxDuration / 1000)];
 
             cooldown = 1000f / perSecond;
-            this.maxLifetime = maxLifetime;
+            this.maxDuration = maxDuration;
         }
 
         protected override void Update()
@@ -53,25 +57,25 @@ namespace osu.Game.Graphics
             // this can happen when seeking in replays.
             if (lastParticleAdded > Time.Current) lastParticleAdded = 0;
 
-            if (Active.Value && CanSpawnParticles && Time.Current > lastParticleAdded + cooldown)
+            if (Active.Value && Time.Current > lastParticleAdded + cooldown)
             {
                 var newParticle = CreateParticle();
-                newParticle.StartTime = (float)Time.Current;
 
-                particles[currentIndex] = newParticle;
+                if (newParticle.HasValue)
+                {
+                    var particle = newParticle.Value;
+                    particle.StartTime = (float)Time.Current;
 
-                currentIndex = (currentIndex + 1) % particles.Length;
-                lastParticleAdded = Time.Current;
+                    particles[currentIndex] = particle;
+
+                    currentIndex = (currentIndex + 1) % particles.Length;
+                    lastParticleAdded = Time.Current;
+                }
             }
 
             Invalidate(Invalidation.DrawNode);
         }
 
-        /// <summary>
-        /// Called each time a new particle should be spawned.
-        /// </summary>
-        protected virtual FallingParticle CreateParticle() => new FallingParticle();
-
         protected override DrawNode CreateDrawNode() => new ParticleSpewerDrawNode(this);
 
         # region DrawNode
@@ -82,7 +86,7 @@ namespace osu.Game.Graphics
 
             protected new ParticleSpewer Source => (ParticleSpewer)base.Source;
 
-            private readonly float maxLifetime;
+            private readonly float maxDuration;
 
             private float currentTime;
             private float gravity;
@@ -93,7 +97,7 @@ namespace osu.Game.Graphics
                 : base(source)
             {
                 particles = new FallingParticle[Source.particles.Length];
-                maxLifetime = (float)Source.maxLifetime;
+                maxDuration = (float)Source.maxDuration;
             }
 
             public override void ApplyState()
@@ -124,7 +128,7 @@ namespace osu.Game.Graphics
                     var alpha = p.AlphaAtTime(timeSinceStart);
                     if (alpha <= 0) continue;
 
-                    var pos = p.PositionAtTime(timeSinceStart, gravity, maxLifetime);
+                    var pos = p.PositionAtTime(timeSinceStart, gravity, maxDuration);
                     var scale = p.ScaleAtTime(timeSinceStart);
                     var angle = p.AngleAtTime(timeSinceStart);
 
@@ -174,7 +178,7 @@ namespace osu.Game.Graphics
 
         #endregion
 
-        protected struct FallingParticle
+        public struct FallingParticle
         {
             public float StartTime;
             public Vector2 StartPosition;