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<h2>22. History and Acknowledgements
<a name="22. History and Acknowledgements"></a>
</h2>

Original
pic was written to go with Joseph Ossanna&rsquo;s
original troff(1) by Brian Kernighan, and later
re-written by Kernighan with substantial enhancements
(apparently as part of the evolution of troff(1) into
ditroff(1) to generate device-independent
output).

The
language had been inspired by some earlier graphics
languages including ideal and grap. Kernighan
credits Chris van Wyk (the designer of ideal) with
many of the ideas that went into pic.

The
pic language was originally described by Brian
Kernighan in Bell Labs Computing Science Technical Report
#116 (you can obtain a PostScript copy of the revised
version, [1], by sending a mail message to
netlib@research.att.com with a body of &lsquo;send
116 from research/cstr&rsquo;). There have been two
revisions, in 1984 and 1991.

The
document you are reading effectively subsumes
Kernighan&rsquo;s description; it was written to fill in
lacun&aelig; in the exposition and integrate in descriptions
of the GNU gpic(1) and pic2plot(1)
features.

The GNU
gpic implementation was written by James Clark &lang;
jjc@jclark.com&rang; .

The GNU
pic2plot implementation is based on James
Clark&rsquo;s parser code and maintained by Robert Maier,
principal author of plotutils.
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