<!-- Creator : groff version 1.21 --> <!-- CreationDate: Wed Feb 9 07:50:05 2011 --> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta name="generator" content="groff -Thtml, see www.gnu.org"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta name="Content-Style" content="text/css"> <style type="text/css"> p { margin-top: 0; margin-bottom: 0; vertical-align: top } pre { margin-top: 0; margin-bottom: 0; vertical-align: top } table { margin-top: 0; margin-bottom: 0; vertical-align: top } h1 { text-align: center } </style> <title>pic-22.html</title> </head> <hr> <a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01 Transitional" height="31" width="88"></a> [ <a href="pic-21.html">prev</a> | <a href="pic-23.html">next</a> | <a href="pic.html">top</a> ] <hr> <h2>22. History and Acknowledgements <a name="22. History and Acknowledgements"></a> </h2> <p style="margin-top: 1em"><font color="#000000">Original <b>pic</b> was written to go with Joseph Ossanna’s original <i>troff</i>(1) by Brian Kernighan, and later re-written by Kernighan with substantial enhancements (apparently as part of the evolution of <i>troff</i>(1) into <i>ditroff</i>(1) to generate device-independent output).</font></p> <p style="margin-top: 1em"><font color="#000000">The language had been inspired by some earlier graphics languages including <b>ideal</b> and <b>grap</b>. Kernighan credits Chris van Wyk (the designer of <b>ideal</b>) with many of the ideas that went into <b>pic</b>.</font></p> <p style="margin-top: 1em"><font color="#000000">The <b>pic</b> 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 <i>netlib@research.att.com</i> with a body of ‘send 116 from research/cstr’). There have been two revisions, in 1984 and 1991.</font></p> <p style="margin-top: 1em"><font color="#000000">The document you are reading effectively subsumes Kernighan’s description; it was written to fill in lacunæ in the exposition and integrate in descriptions of the GNU <i>gpic</i>(1) and <i>pic2plot</i>(1) features.</font></p> <p style="margin-top: 1em"><font color="#000000">The GNU <b>gpic</b> implementation was written by James Clark ⟨<i>jjc@jclark.com</i>⟩. It is currently maintained by Werner Lemberg ⟨<i>wl@gnu.org</i>⟩.</font></p> <p style="margin-top: 1em"><font color="#000000">The GNU <b>pic2plot</b> implementation is based on James Clark’s parser code and maintained by Robert Maier, principal author of <b>plotutils</b>.</font></p> <hr> <a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01 Transitional" height="31" width="88"></a> [ <a href="pic-21.html">prev</a> | <a href="pic-23.html">next</a> | <a href="pic.html">top</a> ] <hr>