public int Fade(Particle particle, float ParticleLifeTime)
{
int fade = particle.Fade;
if (ParticleFadeIn && ParticleFadeOut)
{
FadeDelay = (int)ParticleLifeTime / 2;
}
// Fade in
if (ParticleFadeIn)
{
if (particle.TotalLifetime <= ParticleLifeTime - FadeDelay)
{
fade = (int)(((particle.TotalLifetime) / (ParticleLifeTime - FadeDelay)) * particle.InitialOpacity);
}
}
// Fade out
if (ParticleFadeOut)
{
if (particle.TotalLifetime > FadeDelay)
{
fade = particle.InitialOpacity - (int)(((particle.TotalLifetime - FadeDelay) / (ParticleLifeTime - FadeDelay)) * particle.InitialOpacity);
}
}
return fade;
}
public void Scale(Particle particle, float ParticleLifeTime)
{
if (particle.TotalLifetime < ScaleStartTime)
{
particle.Scale = ScaleFrom;
}
else if (particle.TotalLifetime >= ScaleEndTime)
{
particle.Scale = ScaleTo;
}
else
{
particle.Scale = ScaleFrom + (((particle.TotalLifetime - ScaleStartTime) / (ScaleEndTime - ScaleStartTime)) * (ScaleTo - ScaleFrom));
}
}
private void EmitParticle()
{
if (i > TextureList.Count - 1)
i = 0;
Particle particle = new Particle(TextureList[i],
Position,
(float)RandomizedDouble(ParticleSpeed),
(float)RandomizedDouble(ParticleDirection),
MathHelper.ToRadians((float)RandomizedDouble(ParticleRotation)),
(float)RandomizedDouble(RotationSpeed),
Opacity);
ParticleList.Add(particle);
EmittedNewParticle = true;
LastEmittedParticle = particle;
i++;
}