Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!cam-cl!news
From: cet1@cl.cam.ac.uk (C.E. Thompson)
Newsgroups: comp.lang.postscript
Subject: Re: Spline data points to Bezier curve
Message-ID: <1991Jun6.210140.18085@cl.cam.ac.uk>
Date: 6 Jun 91 21:01:40 GMT
References: <1991Jun3.095901.3793@desire.wright.edu>
Reply-To: cet1@cl.cam.ac.uk (C.E. Thompson)
Organization: U of Cambridge Comp Lab, UK
Lines: 14

In article <1991Jun3.095901.3793@desire.wright.edu> cse0080@desire.wright.edu writes:
>I need to know how to generate spline curves in PostScript when
>all the data I have on hand is an array of data points that lie on 
>the curve itself.  (IE: no control points for the curveto operator)
>
You could do worse than look at the algorithms used by METAFONT to 
choose control points for partially specified paths. They are due to
John Hobby, and are justified in a Stanford U technical report, but
if you just want the formulae you can find them on pp. 130-131 of the
METAFONTbook.

Chris Thompson
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