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Code Issues Releases Wiki Activity

Use structs for parts for added safety

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This commit is contained in:
Dean Herbert 2020-11-19 18:05:41 +09:00
parent 3a7291c5cf
commit 84e73e88d5
1 changed files with 22 additions and 29 deletions
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51
osu.Game/Graphics/ParticleExplosion.cs
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@ -13,8 +13,12 @@ using osuTK;
namespace osu.Game.Graphics
{
/// <summary>
/// An explosion of textured particles based on how osu-stable randomises the explosion pattern.
/// </summary>
public class ParticleExplosion : Sprite
{
private readonly int particleCount;
private readonly double duration;
private double startTime;
@ -23,11 +27,9 @@ namespace osu.Game.Graphics
public ParticleExplosion(Texture texture, int particleCount, double duration)
{
Texture = texture;
this.particleCount = particleCount;
this.duration = duration;
Blending = BlendingParameters.Additive;
for (int i = 0; i < particleCount; i++)
parts.Add(new ParticlePart(duration));
}
protected override void LoadComplete()
@ -36,19 +38,23 @@ namespace osu.Game.Graphics
Restart();
}
/// <summary>
/// Restart the animation from the current point in time.
/// Supports transform time offset chaining.
/// </summary>
public void Restart()
{
startTime = TransformStartTime;
this.FadeOutFromOne(duration);
foreach (var p in parts)
p.Randomise();
parts.Clear();
for (int i = 0; i < particleCount; i++)
parts.Add(new ParticlePart(duration));
}
protected override void Update()
{
base.Update();
Invalidate(Invalidation.DrawNode);
}
@ -56,7 +62,7 @@ namespace osu.Game.Graphics
private class ParticleExplosionDrawNode : SpriteDrawNode
{
private List<ParticlePart> parts = new List<ParticlePart>();
private readonly List<ParticlePart> parts = new List<ParticlePart>();
private ParticleExplosion source => (ParticleExplosion)Source;
@ -73,9 +79,9 @@ namespace osu.Game.Graphics
{
base.ApplyState();
// this is mostly safe as the parts are immutable.
// the most that can go wrong is the random state be incorrect
parts = source.parts;
parts.Clear();
parts.AddRange(source.parts);
sourceSize = source.Size;
startTime = source.startTime;
currentTime = source.Time.Current;
@ -111,22 +117,13 @@ namespace osu.Game.Graphics
}
}
private class ParticlePart
private readonly struct ParticlePart
{
private readonly double availableDuration;
private double duration;
private double direction;
private float distance;
private readonly double duration;
private readonly double direction;
private readonly float distance;
public ParticlePart(double availableDuration)
{
this.availableDuration = availableDuration;
Randomise();
}
public void Randomise()
{
distance = RNG.NextSingle(0.5f);
duration = RNG.NextDouble(availableDuration / 3, availableDuration);
@ -137,12 +134,8 @@ namespace osu.Game.Graphics
public Vector2 PositionAtTime(double time)
{
return new Vector2(0.5f) + positionForOffset(distance * progressAtTime(time));
Vector2 positionForOffset(float offset) => new Vector2(
(float)(offset * Math.Sin(direction)),
(float)(offset * Math.Cos(direction))
);
var travelledDistance = distance * progressAtTime(time);
return new Vector2(0.5f) + travelledDistance * new Vector2((float)Math.Sin(direction), (float)Math.Cos(direction));
}
private float progressAtTime(double time) => (float)Math.Clamp(time / duration, 0, 1);