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Code Issues Releases Wiki Activity

Add ParticleJet

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This commit is contained in:
Opelkuh 2021-08-24 00:15:16 +02:00
parent 52b1539dea
commit 1a60ce164e
3 changed files with 282 additions and 0 deletions
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61
osu.Game.Tests/Visual/Gameplay/TestSceneParticleJet.cs Normal file
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// 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 NUnit.Framework;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Testing;
using osu.Game.Graphics.Particles;
using osu.Game.Skinning;
namespace osu.Game.Tests.Visual.Gameplay
{
[TestFixture]
public class TestSceneParticleJet : OsuTestScene
{
private ParticleJet jet;
[Resolved]
private SkinManager skinManager { get; set; }
public TestSceneParticleJet()
{
AddStep("create", () =>
{
Child = jet = createJet();
});
AddToggleStep("toggle spawning", value => jet.Active = value);
}
[SetUpSteps]
public void SetUpSteps()
{
AddStep("create jet", () => Child = jet = createJet());
}
[Test]
public void TestPresence()
{
AddStep("start jet", () => jet.Active = true);
AddAssert("is present", () => jet.IsPresent);
AddWaitStep("wait for some particles", 3);
AddStep("stop jet", () => jet.Active = false);
AddWaitStep("wait for clean screen", 5);
AddAssert("is not present", () => !jet.IsPresent);
}
private ParticleJet createJet()
{
return new ParticleJet(skinManager.DefaultLegacySkin.GetTexture("star2"), 180)
{
Anchor = Anchor.BottomCentre,
Origin = Anchor.BottomCentre,
RelativePositionAxes = Axes.Y,
Y = -0.1f,
};
}
}
}

49
osu.Game/Graphics/Particles/ParticleJet.cs Normal file
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// 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 osu.Framework.Graphics.Textures;
using osu.Framework.Utils;
using osuTK;
namespace osu.Game.Graphics.Particles
{
public class ParticleJet : ParticleSpewer
{
private const int particles_per_second = 80;
private const double particle_lifetime = 500;
private const float angular_velocity = 3f;
private const int angle_spread = 10;
private const float velocity_min = 1.3f;
private const float velocity_max = 1.5f;
private readonly int angle;
protected override float ParticleGravity => 0.25f;
public ParticleJet(Texture texture, int angle)
: base(texture, particles_per_second, particle_lifetime)
{
this.angle = angle;
}
protected override FallingParticle SpawnParticle()
{
var directionRads = MathUtils.DegreesToRadians(
RNG.NextSingle(angle - angle_spread / 2, angle + angle_spread / 2)
);
var direction = new Vector2(MathF.Sin(directionRads), MathF.Cos(directionRads));
return new FallingParticle
{
StartTime = (float)Time.Current,
Position = OriginPosition,
Duration = RNG.NextSingle((float)particle_lifetime * 0.8f, (float)particle_lifetime),
Velocity = direction * new Vector2(RNG.NextSingle(velocity_min, velocity_max)),
AngularVelocity = RNG.NextSingle(-angular_velocity, angular_velocity),
StartScale = 1f,
EndScale = 2f,
};
}
}
}

172
osu.Game/Graphics/Particles/ParticleSpewer.cs Normal file
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// 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 osu.Framework.Graphics;
using osu.Framework.Graphics.OpenGL.Vertices;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Graphics.Textures;
using osuTK;
namespace osu.Game.Graphics.Particles
{
public abstract class ParticleSpewer : Sprite
{
private readonly FallingParticle[] particles;
private int currentIndex;
private double lastParticleAdded;
private readonly double cooldown;
private readonly double maxLifetime;
/// <summary>
/// Determines whether particles are being spawned.
/// </summary>
public bool Active { get; set; }
public bool HasActiveParticles => Active || (lastParticleAdded + maxLifetime) > Time.Current;
public override bool IsPresent => base.IsPresent && HasActiveParticles;
protected virtual float ParticleGravity => 0.5f;
protected ParticleSpewer(Texture texture, int perSecond, double maxLifetime)
{
Texture = texture;
Blending = BlendingParameters.Additive;
particles = new FallingParticle[perSecond * (int)Math.Ceiling(maxLifetime / 1000)];
cooldown = 1000f / perSecond;
this.maxLifetime = maxLifetime;
}
protected override void Update()
{
base.Update();
if (Active && Time.Current > lastParticleAdded + cooldown)
{
addParticle(SpawnParticle());
}
Invalidate(Invalidation.DrawNode);
}
/// <summary>
/// Called each time a new particle should be spawned.
/// </summary>
protected abstract FallingParticle SpawnParticle();
private void addParticle(FallingParticle fallingParticle)
{
particles[currentIndex] = fallingParticle;
currentIndex = (currentIndex + 1) % particles.Length;
lastParticleAdded = Time.Current;
}
protected override DrawNode CreateDrawNode() => new ParticleSpewerDrawNode(this);
private class ParticleSpewerDrawNode : SpriteDrawNode
{
private readonly FallingParticle[] particles;
protected new ParticleSpewer Source => (ParticleSpewer)base.Source;
private float currentTime;
private float gravity;
public ParticleSpewerDrawNode(Sprite source)
: base(source)
{
particles = new FallingParticle[Source.particles.Length];
}
public override void ApplyState()
{
base.ApplyState();
Source.particles.CopyTo(particles, 0);
currentTime = (float)Source.Time.Current;
gravity = Source.ParticleGravity;
}
protected override void Blit(Action<TexturedVertex2D> vertexAction)
{
foreach (var p in particles)
{
// ignore particles that weren't initialized.
if (p.StartTime <= 0) continue;
var timeSinceStart = currentTime - p.StartTime;
var alpha = p.AlphaAtTime(timeSinceStart);
if (alpha <= 0) continue;
var scale = p.ScaleAtTime(timeSinceStart);
var pos = p.PositionAtTime(timeSinceStart, gravity);
var angle = p.AngleAtTime(timeSinceStart);
var rect = new RectangleF(
pos.X - Texture.DisplayWidth * scale / 2,
pos.Y - Texture.DisplayHeight * scale / 2,
Texture.DisplayWidth * scale,
Texture.DisplayHeight * scale);
var quad = new Quad(
transformPosition(rect.TopLeft, rect.Centre, angle),
transformPosition(rect.TopRight, rect.Centre, angle),
transformPosition(rect.BottomLeft, rect.Centre, angle),
transformPosition(rect.BottomRight, rect.Centre, angle)
);
DrawQuad(Texture, quad, DrawColourInfo.Colour.MultiplyAlpha(alpha), null, vertexAction,
new Vector2(InflationAmount.X / DrawRectangle.Width, InflationAmount.Y / DrawRectangle.Height),
null, TextureCoords);
}
}
private Vector2 transformPosition(Vector2 pos, Vector2 centre, float angle)
{
// rotate point around centre.
float cos = MathF.Cos(angle);
float sin = MathF.Sin(angle);
float x = centre.X + (pos.X - centre.X) * cos + (pos.Y - centre.Y) * sin;
float y = centre.Y + (pos.Y - centre.Y) * cos - (pos.X - centre.X) * sin;
// convert to screen space.
return Vector2Extensions.Transform(new Vector2(x, y), DrawInfo.Matrix);
}
}
protected struct FallingParticle
{
public float StartTime;
public Vector2 Position;
public Vector2 Velocity;
public float Duration;
public float AngularVelocity;
public float StartScale;
public float EndScale;
public float AlphaAtTime(float timeSinceStart) => 1 - progressAtTime(timeSinceStart);
public float ScaleAtTime(float timeSinceStart) => StartScale + (EndScale - StartScale) * progressAtTime(timeSinceStart);
public float AngleAtTime(float timeSinceStart) => AngularVelocity / 1000 * timeSinceStart;
public Vector2 PositionAtTime(float timeSinceStart, float gravity)
{
var progress = progressAtTime(timeSinceStart);
var grav = new Vector2(0, -gravity) * progress;
return Position + (Velocity - grav) * timeSinceStart;
}
private float progressAtTime(float timeSinceStart) => Math.Clamp(timeSinceStart / Duration, 0, 1);
}
}
}