Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!ut-sally!utah-cs!utah-gr!mueller From: mueller@utah-gr.UUCP (Tim Mueller) Newsgroups: comp.windows.x Subject: Re: speaking of curves ... Message-ID: <2090@utah-gr.UUCP> Date: Fri, 17-Jul-87 12:46:15 EDT Article-I.D.: utah-gr.2090 Posted: Fri Jul 17 12:46:15 1987 Date-Received: Sat, 18-Jul-87 14:50:24 EDT References: <553487792.rfb@h.cs.cmu.edu> Reply-To: mueller@utah-gr.UUCP (Tim Mueller) Distribution: world Organization: University of Utah CS Dept Lines: 11 Keywords: curves, rational b-splines, circles The X 10 manual says is uses "a spline algorithm ... to draw a smooth curve from the previous vertex, through this one, to the next vertex". This is ambiguous and I haven't tried it, but whatever it does it definitely does not do rational splines since there are only two coordinates per vertex. This means that you can't do circles exactly and is the reason you need lots of points to make your curve look like a circle (it's really lots of little parabolas). Tim Mueller University of Utah mueller@cs.utah.edu