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From: sbw@naucse.UUCP (Steve Wampler)
Newsgroups: comp.graphics
Subject: More on Liang-Barsky Polygon Clipping
Message-ID: <254@naucse.UUCP>
Date: Thu, 5-Mar-87 12:58:49 EST
Article-I.D.: naucse.254
Posted: Thu Mar  5 12:58:49 1987
Date-Received: Sun, 8-Mar-87 00:54:12 EST
Organization: Northern Arizona University, Flagstaff, Arizona
Lines: 17


  I recently posted some questions about the correctness of
  the published version of Liang and Barsky's polygon clipping
  algorithm.  Some more thought has convinced that it does
  not handle vertical and horizontal lines properly.  I made
  a patch to the algorithm and now have it running (the patch
  actually simplifies the code, though I hesitate to call it
  a fix, since it's ugly).

  In any event, if I'm correct (remember I'm desparate, and
  desparate people believe anything), this must have come up
  before.  I would still appreciate being pointed to a proper
  fix.

  Thanks!
	Steve Wampler
	{.....!arizona!naucse!sbw}