ClipRect
ClipRect
Set clipping region to a rectangle Rect *newClip ; rectangle in local coordinates rectangle.
newClip is the address of an 8-byte Rect structure. Upon return, the clipping region of the active GrafPort is set to be the same as newClip.
Notes: This modifies the data of the clipping region identified by the clipRgn field
of the active GrafPort. The previous definition of the region is lost. For temporarily modifying the clipping region, you may save the current
value via GetClip, before making this call and then restore it via SetClip.