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Code Editor : pic-1.html

<!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-1.html</title>

</head>
<hr>
[ <a href="pic-2.html">next</a> | <a href="pic.html">top</a> ]
<hr>

<h2>1. Introduction to PIC
<a name="1. Introduction to PIC"></a>
</h2>

The pic language provides
an easy way to write procedural box-and-arrow diagrams to be
included in troff documents. The language is
sufficiently flexible to be quite useful for state charts,
Petri-net diagrams, flow charts, simple circuit schematics,
jumper layouts, and other kinds of illustration involving
repetitive uses of simple geometric forms and splines.
Because these descriptions are procedural and object-based,
they are both compact and easy to modify.

The phrase &ldquo;GNU pic&rdquo;
may refer to either of two pic implementations
distributed by the Free Software Foundation and intended to
accept the same input language. The gpic(1)
implementation is for use with the groff(1)
implementation of troff. The pic2plot(1)
implementation runs standalone and is part of the
plotutils package. Because both implementations are
widely available in source form for free, they are good bets
for writing very portable documentation.

<h3>1.2. PIC Versions
<a name="1.2. PIC Versions"></a>
</h3>

The original 1984
pre-ditroff(1) version of pic is long
obsolete. The rewritten 1991 version is still available as
part of the Documenter&rsquo;s Work Bench module of System
V.

Where differences between
Documenter&rsquo;s Work Bench (1991) pic and GNU
pic need to be described, original pic is
referred to as &ldquo;DWB pic&rdquo;. Details on the history
of the program are given at the end of this document.

The pic2plot program does
not require the rest of the groff(1) toolchain to
render graphics. It can display pic diagrams in an
X&nbsp;window, or generate output plots in a large number of
other formats. These formats include: PNG, PBM, PGM, PPM,
GIF, SVG, Adobe Illustrator format, idraw-editable
Postscript, the WebCGM format for Web-based vector graphics,
the format used by the xfig drawing editor, the
Hewlett-Packard PCL&nbsp;5 printer language, the
Hewlett-Packard Graphics Language (by default, HP-GL/2), the
ReGIS (remote graphics instruction set) format developed by
DEC, Tektronix format, and device-independent GNU graphics
metafile format.

In this document, gpic(1)
and pic2plot(1) extensions are marked as such.
<hr>
[ <a href="pic-2.html">next</a> | <a href="pic.html">top</a> ]
<hr>

${this.title}

Code Editor : pic-1.html