Legacy Document

Important: The information in this document is obsolete and should not be used for new development.

Inside Macintosh: Imaging With QuickDraw /

Chapter 3 - QuickDraw Drawing / QuickDraw Drawing Reference

EraseRgn
To erase a region, use the EraseRgn procedure.
PROCEDURE EraseRgn (rgn: RgnHandle);
rgn
The region to erase.

DESCRIPTION
Using the patCopy pattern mode, the EraseRgn procedure draws the interior of the region whose handle you pass in the rgn parameter with the background pattern for the current graphics port.
This procedure leaves the location of the graphics pen unchanged.

SPECIAL CONSIDERATIONS
The EraseRgn procedure may move or purge memory blocks in the application heap. Your application should not call this procedure at interrupt time.

SEE ALSO
The patCopy pattern mode is described in "Boolean Transfer Modes With 1-Bit Pixels" beginning on page 3-7.