Xref: utzoo comp.graphics:4623 sci.math:5816 comp.sources.wanted:6520
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!batcomputer!itsgw!steinmetz!uunet!microsoft!w-colinp
From: w-colinp@microsoft.UUCP (Colin Plumb)
Newsgroups: comp.graphics,sci.math,comp.sources.wanted
Subject: Re: looking for a fast ellipse algorithm
Message-ID: <741@microsoft.UUCP>
Date: 24 Feb 89 22:24:54 GMT
References: <395@brunix.UUCP> <4070@ingr.com>
Reply-To: w-colinp@microsoft.uucp (Colin Plumb)
Organization: very little
Lines: 16

dan@ingr.com (Dan Webb) wrote:
> 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 don't know what it is, but it's not perfect.  Very extreme ellipses have
holes in them.  At least, that's the case with the 64K ROMs.  I don't
know about the more recent ones.

There are plenty of disassemblied of the Mac ROMs floating around, although
Apple gets mad if they're too prominent.
-- 
	-Colin (uunet!microsoft!w-colinp)

"Don't listen to me.  I never do."