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From: ljdickey@watmath.UUCP (Lee Dickey)
Newsgroups: net.misc
Subject: Re: Wanted - Conic Sections Raster Algorithms
Message-ID: <7765@watmath.UUCP>
Date: Wed, 16-May-84 08:01:10 EDT
Article-I.D.: watmath.7765
Posted: Wed May 16 08:01:10 1984
Date-Received: Thu, 17-May-84 01:56:13 EDT
References: <6913@rochester.UUCP>
Organization: U of Waterloo, Ontario
Lines: 13

> Arbitrary conic sections:  A x**2 + B y**2 + C x y + D x + E y + F = 0
> Arbitrary ellipses:        A x**2 + B y**2 + C x y + F = 0
>  (and hyperbolae)
>

Be carefull here!
The second equation includes examples of *all three* classes of conic sections.
The first equation represents a parabola if and only if   4AB = C**2.
Notice that the class of the conic has nothing to do with the values 
of  D  and  E .
-- 
  Lee Dickey, University of Waterloo.  (ljdickey@watmath.UUCP)
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