Set the artist’s clip path, which may be:
- a Patch(or subclass) instance
- 
- a Pathinstance, in which case
- an optional Transforminstance may be provided, which will be applied to the
path before using it for clipping.
 
- None, to remove the clipping path
For efficiency, if the path happens to be an axis-aligned
rectangle, this method will set the clipping box to the
corresponding rectangle and set the clipping path to None.
ACCEPTS: [ (Path,
Transform) |
Patch | None ]