Coordinate systems have their origins at the lower left.  It seems you
are not taking your window's height into account.  NSWindow has the
-setFrameTopLeftPoint: to help you here.

The Cocoa Drawing Guide has more:
http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Transforms/Transforms.html#//apple_ref/doc/uid/TP40003290-CH204-SW2

--Kyle Sluder
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