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using System;
using System.Collections.Generic;
using MonoGame.Extended.Particles.Modifiers.Interpolators;
namespace MonoGame.Extended.Particles.Modifiers
{
public class VelocityModifier : Modifier
{
public List<Interpolator> Interpolators { get; set; } = new List<Interpolator>();
public float VelocityThreshold { get; set; }
public override unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
var velocityThreshold2 = VelocityThreshold*VelocityThreshold;
var n = Interpolators.Count;
while (iterator.HasNext)
{
var particle = iterator.Next();
var velocity2 = particle->Velocity.LengthSquared();
if (velocity2 >= velocityThreshold2)
{
for (var i = 0; i < n; i++)
{
var interpolator = Interpolators[i];
interpolator.Update(1, particle);
}
}
else
{
var t = (float) Math.Sqrt(velocity2)/VelocityThreshold;
for (var i = 0; i < n; i++)
{
var interpolator = Interpolators[i];
interpolator.Update(t, particle);
}
}
}
}
}
}
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