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Internet Message Format  |  1992-07-30  |  910 b 
  1. Path: sparky!uunet!olivea!apple!cambridge.apple.com!ranson@LANNION.cnet.fr
  2. From: ranson@LANNION.cnet.fr (Ranson)
  3. Newsgroups: comp.lang.lisp.mcl
  4. Subject: Re: Drawing color shapes on a monochrome monitor
  5. Message-ID: <m0mDqGe-00000CC@lamd01>
  6. Date: 31 Jul 92 08:15:00 GMT
  7. Sender: info-mcl-request@cambridge.apple.com
  8. Lines: 5
  9. Approved: comp.lang.lisp.mcl@Cambridge.Apple.C0M
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  11.     Relayed; 31 Jul 92 08: 13:52+0200
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  14. Original-To: info-mcl@cambridge.apple.com, paul@vault.WUstl.EDU
  15. Original-Cc: ranson@LANNION.cnet.fr
  16.  
  17. I think this is a documented feature of ColorQD: When the fore color would map
  18. to the same as the back color, it is inverted first.
  19. You should try one of the Erase traps. Erasing in QD is drawing with the back
  20. color, but (I think) without the previous feature.
  21.      Daniel.
  22.