/// Create an autoreleased box shape centered on the center of gravity.
+ (id)boxWithBody:(ChipmunkBody *)body width:(cpFloat)width height:(cpFloat)height;
As ChipmunkCirlceShape has an offset param for the equivalent method.
/// Create an autoreleased circle shape with the given radius and offset from the center of gravity.
+ (id)circleWithBody:(ChipmunkBody *)body radius:(cpFloat)radius offset:(cpVect)offset;
There is an alternate version that allows you to specify a bounding body instead of just width/height. It wasn't there originally because the box creation method was just a convenience method to create a four sided polygon for you. Creating a centered box was the most common usage, so I did that first.
Can't sleep... Chipmunks will eat me...
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