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From: darweesh@zephyrus.crd.ge.com (Michael Darweesh)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Large Offscreen Drawing - help please
Message-ID: <14033@crdgw1.crd.ge.com>
Date: 19 Nov 90 21:24:27 GMT
References: <11722@hubcap.clemson.edu>
Sender: news@crdgw1.crd.ge.com
Organization: General Electric Corporate R&D Center
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You must make sure that the visRgn and the clipRgn of the port that you're
working with include your whole bitmap. Normally, the visRgn and clipRgn
are inherited from the standard (I forget the word right now) port.
Make sure that these are correct and that the portRect is correct too.
Everything should be fine then. I usually set the portRect and then convert
this to a Rgn directly into the port's visRgn variable. (use the RectRgn
procedure)  There is no "SetVisRgn" call, so you basically have to do it
manually-no big deal. If you have problems, feel free to send me private
e-mail. I've done this...but I may have flubbed something up-I wrote it
and just cut & paste it now. :->

-Mike Darweesh
weesh@crd.ge.com