CGContextEOClip
Modifies the current clipping path, using the even-odd rule.
Declaration
extern void CGContextEOClip(CGContextRef c);Parameters
- c:
A graphics context containing a path. If the context does not have a current path, the function does nothing.
Discussion
The function uses the even-odd rule to calculate the intersection of the current path with the current clipping path. The path resulting from the intersection is used as the new current clipping path for subsequent painting operations.
If the current path includes any open subpaths, the paths are treated as if they were closed by calling closePath().
Unlike the current path, the current clipping path is part of the graphics state. Therefore, to re-enlarge the paintable area by restoring the clipping path to a prior state, you must save the graphics state before you clip and restore the graphics state after you’ve completed any clipped drawing.
After determining the new clipping path, the function resets the context’s current path to an empty path.