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From: Hartmut Henkel <hartmut_henkel@gmx.de>
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Subject: Re: Here's a strange one for Metapost gurus
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Hi David,

it happens already in figure 6! By writing

path left;
...
path right;

you have redefined internal things "left" and "right". With e. g.

  %draw spring block left
  path xleft;
  xleft:=(2,9)--(3,9)--(3,11)--(2,11)--cycle;
  xleft:=xleft scaled u;
  stripe_path_a(withcolor black)(draw)
  xleft withcolor white;
  draw (3u,9u)--(3u,11u);

  %draw spring block right
  path xright;
  xright:=(17,9)--(18,9)--(18,11)--(17,11)--cycle;
  xright:=xright scaled u;
  stripe_path_a(withcolor black)(draw)
  xright withcolor white;
  draw (17u,9u)--(17u,11u);

it works.

Regards, Hartmut


------------------------------------------------------------------------
Hartmut Henkel, Oftersheim, Germany
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