The Apple documentation on Quartz 2d is pretty good (although depending on how familiar you are with the rest of the system, you might need to follow some of th

The Apple documentation on Quartz 2d is pretty good (although depending on how familiar you are with the rest of the system, you might need to follow some of the links to read about the other parts): https://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_overview/dq_overview.html#//apple_ref/doc/uid/TP30001066-CH202 https://developer.apple.com/library/mac/#documentation/Graph...