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From: ye@henri.ucsb.edu
Newsgroups: comp.graphics
Subject: Three-Point Arc: Algorithm Wanted
Message-ID: <10082@hub.ucsb.edu>
Date: 20 Mar 91 22:29:48 GMT
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Organization: University of California, Santa Barbara
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Hi everyone,

I am looking for an algorithm for the following problem:
	Given an arc that starts at point (x1,y1), passes
	through point (x2,y2), and ends at point (x3,y3)
	find its equivalent representation by a center point
	(x0,y0), the radius R, and the sweep angle (alpha).

If there is an existing algorithm somewhere, could somebody
tell me where I can find it? Thanks,

David