Bad idea to set tag to 0

Divide an int by int returns an int. So, 100/255 will give you 0 in C.

Very much like python

CGGeometry documentation

http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Reference/CGGeometry/Reference/reference.html

e.g

Getting Min, Mid, and Max Values

Latest Python Developer’s Guide:

http://docs.python.org/devguide/setup.html

http://docs.python.org/devguide/setup.html

CGContextMoveToPoint