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Important: The information in this document is obsolete and should not be used for new development.

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Inside Macintosh: Imaging With QuickDraw /
Chapter 3 - QuickDraw Drawing / QuickDraw Drawing Reference
Routines / Drawing Regions


To erase a region, use the EraseRgn procedure.

PROCEDURE EraseRgn (rgn: RgnHandle);
The region to erase.
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.

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

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

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© Apple Computer, Inc.
7 JUL 1996