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.