// add force and dye to fluid, and create particles
void msaFluidParticlesApp::addToFluid( Vec2f pos, Vec2f vel, bool addColor, bool addForce )
{
float speed = vel.x * vel.x + vel.y * vel.y * getWindowAspectRatio() * getWindowAspectRatio(); // balance the x and y components of speed with the screen aspect ratio
if( speed > 0 ) {
pos.x = constrain( pos.x, 0.0f, 1.0f );
pos.y = constrain( pos.y, 0.0f, 1.0f );
const float colorMult = 100;
const float velocityMult = 30;
if( addColor ) {
Color drawColor( CM_HSV, ( getElapsedFrames() % 360 ) / 360.0f, 1, 1 );
fluidSolver.addColorAtPos( pos, drawColor * colorMult );
if( drawParticles )
particleSystem.addParticles( pos * Vec2f( getWindowSize() ), 10 );
}
if( addForce )
fluidSolver.addForceAtPos( pos, vel * velocityMult );
if( ! drawFluid && getElapsedFrames()%5==0 )
fadeToColor( 0, 0, 0, 0.1f );
}
}
