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[Groff] Extending GNU PIC to include animation

From: Gaius Mulley
Subject: [Groff] Extending GNU PIC to include animation
Date: 10 Mar 2005 19:24:26 +0000
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2


I was wondering if this idea has any wider usage (and whether it
is feasible or whether the idea has been tried before?). Basically I
was wondering if it is possible to extend the PIC language to
include time and movement.


   [assuming B1 has already been defined as a PIC entity]
   frames per second 24
   total time 5 seconds
   on second 1 move B1 over 2 seconds linearly along line right
   on second 3 move B1 over 2 seconds increasing exponentially along spline ...

then the extended PIC (or PIC preprocessor) would create 5 seconds of
animation.  Essentially it creates 5*24 still pictures, passes them
individually to:

  groff -p -ms >
  converts into n.png

and finally invokes mencoder to package up the 5*24 frames into an
MPEG2 movie.

Some of its uses could be to animate data structures, or network
packets flowing between machines etc..


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