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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