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From: Emil Hedevang Lohse <emil@imf.au.dk>
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Subject: Re: METAPOST problem
Date: Mon, 22 Sep 2003 21:59:05 +0200
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Apparently it takes some time for my suggestion to get through to the
mailing list, so I send you a direct answer:

Isn't it easier to use arctime and the specify A and B as lengths
instead of points? For example:

  A := 1cm;
  B := 1cm;
  draw subpath (arctime A of c, arctime (arclength c) - B of c) of c;

The code is not tested.
 
Regards,

-- 
Emil Hedevang Lohse <http://home.imf.au.dk/emil/> 

Alle spørgsmål er lige dumme. 
Og spørgsmålet "Kan ænder flyve?" er ikke dumt.