Subclass the class and override the update method to mess with particles:

- (void)update:(SPEnterFrameEvent*)event{
	for(int i=0; i<numPointSprites; i++){
		SXPSData *ps = &pointSprites[i];
		ps->x += i * .1;
		ps->y += i * .1;
	}
	[super update:event];
}

• 2011/04/11 22:24: First public version

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