On Jun 20, 2011, at 4:57 PM, Steve wrote:

> I am not used to printing from the bottom up.  Why is this method preferred over top left = 0,0 ?

It’s not a matter of preferences. CG ( CoreGraphics aka Quartz 2D ) operates with the lower left coordinate as 0,0. Since the demo uses a CGContextRef, it is constrained by the rules of CG. A read of Apple’s "Quartz 2D Programming Guide" explains all this in detail.


Brian S