diff options
Diffstat (limited to 'Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers')
3 files changed, 153 insertions, 0 deletions
diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/CircleContainerModifier.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/CircleContainerModifier.cs new file mode 100644 index 0000000..30d2802 --- /dev/null +++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/CircleContainerModifier.cs @@ -0,0 +1,52 @@ +using System; +using Microsoft.Xna.Framework; + +namespace MonoGame.Extended.Particles.Modifiers.Containers +{ + public class CircleContainerModifier : Modifier + { + public float Radius { get; set; } + public bool Inside { get; set; } = true; + public float RestitutionCoefficient { get; set; } = 1; + + public override unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator) + { + var radiusSq = Radius*Radius; + while (iterator.HasNext) + { + var particle = iterator.Next(); + var localPos = particle->Position - particle->TriggerPos; + + var distSq = localPos.LengthSquared(); + var normal = localPos; + normal.Normalize(); + + if (Inside) + { + if (distSq < radiusSq) continue; + + SetReflected(distSq, particle, normal); + } + else + { + if (distSq > radiusSq) continue; + + SetReflected(distSq, particle, -normal); + } + } + } + + private unsafe void SetReflected(float distSq, Particle* particle, Vector2 normal) + { + var dist = (float) Math.Sqrt(distSq); + var d = dist - Radius; // how far outside the circle is the particle + + var twoRestDot = 2*RestitutionCoefficient* + Vector2.Dot(particle->Velocity, normal); + particle->Velocity -= twoRestDot*normal; + + // exact computation requires sqrt or goniometrics + particle->Position -= normal*d; + } + } +}
\ No newline at end of file diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/RectangleContainerModifier.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/RectangleContainerModifier.cs new file mode 100644 index 0000000..a56e072 --- /dev/null +++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/RectangleContainerModifier.cs @@ -0,0 +1,59 @@ +using Microsoft.Xna.Framework; + +namespace MonoGame.Extended.Particles.Modifiers.Containers +{ + public sealed class RectangleContainerModifier : Modifier + { + public int Width { get; set; } + public int Height { get; set; } + public float RestitutionCoefficient { get; set; } = 1; + + public override unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator) + { + while (iterator.HasNext) + { + var particle = iterator.Next(); + + var left = particle->TriggerPos.X + Width*-0.5f; + var right = particle->TriggerPos.X + Width*0.5f; + var top = particle->TriggerPos.Y + Height*-0.5f; + var bottom = particle->TriggerPos.Y + Height*0.5f; + + var xPos = particle->Position.X; + var xVel = particle->Velocity.X; + var yPos = particle->Position.Y; + var yVel = particle->Velocity.Y; + + if ((int) particle->Position.X < left) + { + xPos = left + (left - xPos); + xVel = -xVel*RestitutionCoefficient; + } + else + { + if (particle->Position.X > right) + { + xPos = right - (xPos - right); + xVel = -xVel*RestitutionCoefficient; + } + } + + if (particle->Position.Y < top) + { + yPos = top + (top - yPos); + yVel = -yVel*RestitutionCoefficient; + } + else + { + if ((int) particle->Position.Y > bottom) + { + yPos = bottom - (yPos - bottom); + yVel = -yVel*RestitutionCoefficient; + } + } + particle->Position = new Vector2(xPos, yPos); + particle->Velocity = new Vector2(xVel, yVel); + } + } + } +}
\ No newline at end of file diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/RectangleLoopContainerModifier.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/RectangleLoopContainerModifier.cs new file mode 100644 index 0000000..4da6efa --- /dev/null +++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/Containers/RectangleLoopContainerModifier.cs @@ -0,0 +1,42 @@ +using Microsoft.Xna.Framework; + +namespace MonoGame.Extended.Particles.Modifiers.Containers +{ + public class RectangleLoopContainerModifier : Modifier + { + public int Width { get; set; } + public int Height { get; set; } + + public override unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator) + { + while (iterator.HasNext) + { + var particle = iterator.Next(); + var left = particle->TriggerPos.X + Width*-0.5f; + var right = particle->TriggerPos.X + Width*0.5f; + var top = particle->TriggerPos.Y + Height*-0.5f; + var bottom = particle->TriggerPos.Y + Height*0.5f; + + var xPos = particle->Position.X; + var yPos = particle->Position.Y; + + if ((int) particle->Position.X < left) + xPos = particle->Position.X + Width; + else + { + if ((int) particle->Position.X > right) + xPos = particle->Position.X - Width; + } + + if ((int) particle->Position.Y < top) + yPos = particle->Position.Y + Height; + else + { + if ((int) particle->Position.Y > bottom) + yPos = particle->Position.Y - Height; + } + particle->Position = new Vector2(xPos, yPos); + } + } + } +}
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