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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);
}
}
}
}
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