Particles are emitted along a line from (emitterPosition.x - emitterSize.width/2, emitterPosition.y, emitterZPosition) to (emitterPosition.x + emitterSize.width/2, emitterPosition.y, emitterZPosition).
Available in Mac OS X v10.6 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later)