ClipRect
ClipRect Set clipping region to a rectangle
#include <Quickdraw.h> Quickdraw
void ClipRect(newClip );
Rect *newClip ; rectangle in local coordinates
ClipRect sets the clipping region of the current GrafPort to the specified
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.
Returns: none

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.