http://watchingapple.com/2008/04/core-animation-creating-a-jack-in-the-box-with-cakeyframeanimation/
Rotate CGPath without changing its position
A path doesn't have “a position”. A path is a set of points (defined by line and curve segments). Every point has its own position. Perhaps you want to rotate the path around a particular point, instead of around the origin. The trick is to create a composite transform that combines three individual transforms: Translate the origin to the rotation point. Rotate. Invert the translation from step 1.
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Accessing and Pretty-Printing the Elements of a CGPath
