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From: baer@qiclab.scn.rain.com (Ken Baer)
Newsgroups: comp.sys.mac.programmer
Subject: Drawing in XOR with masking?
Message-ID: <1991Mar7.190620.19609@qiclab.scn.rain.com>
Date: 7 Mar 91 19:06:20 GMT
Organization: SCN Research/Qic Laboratories of Tigard, Oregon.
Lines: 26

I have a technical graphics question that I have not been able to get
answered yet.  I have only been working on the Mac for the last few
months, but have done a lot of graphics programming on the Amiga (no
derogatory comments please :-).  

I am trying to draw in XOR mode, but with plane masking, so I can draw
in the color I want, and be able to XOR those colors.  On the Amiga we
were able to do with by using SetMask() with COMPLIMENT draw mode.  I
have, so far, been unable to find an equivalent on the Mac.  I'm writing
this for an interface for a 3D object modeller, which needs to use color
for highlighting control points, so I need to use XOR for real time
manipulation, but I need to have control over what colors I'm drawing in.

So far, all of the examples of XOR I've seen are in B&W.  I assume that
there must be some other people out there doing what I'm trying to do.
If you have some suggestions, or better yet, sample code, please e-mail
it to me.  This is a major problem right now (for this project), so any
help is greatly appreciated.  Thanks in advance!

	-Ken Baer.
	Hash Enterprises
	baer@qiclab.UUCP
-- 
    //    -Ken Baer.  Programmer/Animator, Hash Enterprises / Earthling
  \X/     Usenet: baer@qiclab.UUCP  or  PLink: KEN BAER
         "What?!? Sore again?" -- Bugs Bunny to Yosemity Sam