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From: jurjen@cwi.nl (Jurjen N.E. Bos)
Newsgroups: comp.graphics,sci.math,comp.sources.wanted
Subject: Re: looking for a fast ellipse algorithm
Keywords: Fast graphics
Message-ID: <7927@boring.cwi.nl>
Date: 24 Feb 89 09:49:03 GMT
References: <395@brunix.UUCP> <4070@ingr.com>
Organization: CWI, Amsterdam
Lines: 14

In article <4070@ingr.com> dan@ingr.com (Dan Webb) writes:
>After skimming through all the replies to the question of a fast ellipse
>algorithm, I have yet to see the algorithm used by the Macintosh, which
>happens to be very fast and mathematically perfect.  Why doesn't anyone
>seem to know what it is?  Is it proprietary?  Apple?

I'm sorry to correct you, but the (very fast) algorithm by the Mac is not
mathematically perfect.  You'll find out by drawing a very slim ellipse
(say 5 pixels times 200 pixels): You get an ellipse with holes in it.
I am a little bit disappointed by this fact; the routines are for the rest
nearly perfect and very powerful.
By the way, I also like to know how the routines used by the Mac.
-- 
  -- Jurjen N.E. Bos (jurjen@cwi.nl)