public override void AffectParticles( ParticleSystem system, float timeElapsed )
{
if ( !colorImageLoaded )
{
loadImage();
}
int width = colorImage.Width - 1;
float height = colorImage.Height - 1;
// loop through the particles
for ( int i = 0; i < system.Particles.Count; i++ )
{
Particle p = (Particle)system.Particles[ i ];
// life_time, float_index, index and position are CONST in OGRE, but errors here
// We do not have the concept of a total time to live!
float life_time = p.totalTimeToLive;
float particle_time = 1.0f - ( p.timeToLive / life_time );
if ( particle_time > 1.0f )
{
particle_time = 1.0f;
}
if ( particle_time < 0.0f )
{
particle_time = 0.0f;
}
float float_index = particle_time * width;
int index = (int)float_index;
int position = index * 4;
if ( index <= 0 )
{
p.Color = colorImage.GetColorAt( 0, 0, 0 );
}
else if ( index >= width )
{
p.Color = colorImage.GetColorAt( width, 0, 0 );
}
else
{
// fract, to_color and from_color are CONST in OGRE, but errors here
float fract = float_index - (float)index;
float toColor = fract;
float fromColor = (1 - toColor );
ColorEx from = colorImage.GetColorAt( index, 0, 0 ),
to = colorImage.GetColorAt( index + 1, 0, 0 );
p.Color.r = ( from.r * fromColor ) + ( to.r * toColor );
p.Color.g = ( from.g * fromColor ) + ( to.g * toColor );
p.Color.b = ( from.b * fromColor ) + ( to.b * toColor );
p.Color.a = ( from.a * fromColor ) + ( to.a * toColor );
}
}
}
