124 lines
3.0 KiB
Groff
124 lines
3.0 KiB
Groff
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.\" Id: pic2graph.man,v 1.3 2002/07/17 04:55:46 wlemb Exp
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.\" This documentation is released to the public domain.
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.TH PIC2GRAPH @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
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.IX pic2graph
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.SH NAME
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pic2graph \- convert a PIC diagram into a cropped image
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.
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.
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.SH SYNOPSIS
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.B pic2graph
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[
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.B \-unsafe
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]
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[
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.BI \-format\ fmt
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]
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[
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.BI \-eqn\ delim
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]
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.
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.
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.SH DESCRIPTION
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Reads a PIC program as input; produces an image file (by default in
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Portable Network Graphics format) suitable for the Web as output.
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Also translates
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.BR @g@eqn (@MAN1EXT@)
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constructs, so it can be used for generating images of mathematical
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formulae.
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.P
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PIC is a rather expressive graphics minilanguage suitable for
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producing box-and-arrow diagrams of the kind frequently used in
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technical papers and textbooks. The language is sufficiently flexible
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to be quite useful for state charts, Petri-net diagrams, flow charts,
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simple circuit schematics, jumper layouts, and other kinds of
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illustration involving repetitive uses of simple geometric forms and
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splines. Because PIC descriptions are procedural and object-based,
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they are both compact and easy to modify.
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.P
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The PIC language is fully documented in "\fIMaking Pictures With GNU
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PIC\fP", a document which is part of the
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.BR groff (@MAN1EXT@)
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distribution.
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.P
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Your input PIC code should \fInot\fR be wrapped with the .PS and .PE macros
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that normally guard it within
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.BR groff (@MAN1EXT@)
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macros.
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.P
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The output image will be a black-on-white graphic clipped to the
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smallest possible bounding box that contains all the black pixels.
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By specifying command-line options to be passed to
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.BR convert (1)
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you can give it a border, set the background transparent, set the
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image's pixel density, or perform other useful transformations.
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.P
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This program uses
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.BR @g@pic (@MAN1EXT@),
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.BR @g@eqn (@MAN1EXT@),
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.BR groff (@MAN1EXT@),
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.BR gs (1),
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and the ImageMagick
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.BR convert (1)
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program.
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These programs must be installed on your system and accessible on your
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$PATH for \fBpic2graph\fR to work.
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.
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.
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.SH OPTIONS
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.TP
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.B \-unsafe
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Run
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.BR @g@pic (@MAN1EXT@)
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and
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.BR groff (@MAN1EXT@)
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in the `unsafe' mode enabling the PIC macro
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.B sh
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to execute arbitrary commands. The default is to forbid this.
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.TP
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.BI \-format\ fmt
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Specify an output format; the default is PNG (Portable Network Graphics).
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Any format that
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.BR convert (1)
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can emit is supported.
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.TP
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.BI \-eqn\ delim
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Change the fencepost characters that delimit
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.BR @g@eqn (@MAN1EXT@)
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directives
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.RB ( $
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and
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.BR $ ,
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by default). This option requires an argument, but an empty string is
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accepted as a directive to disable
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.BR @g@eqn (@MAN1EXT@)
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processing.
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.PP
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Command-line switches and arguments not listed above are passed to
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.BR convert (1).
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.
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.
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.SH FILES
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.TP \w'\fB@MACRODIR@/eqnrc'u+2n
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.B @MACRODIR@/eqnrc
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The
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.BR @g@eqn (@MAN1EXT@)
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initialization file.
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.
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.
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.SH "SEE ALSO"
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.BR eqn2graph (@MAN1EXT@),
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.BR @g@pic (@MAN1EXT@),
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.BR @g@eqn (@MAN1EXT@),
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.BR groff (@MAN1EXT@),
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.BR gs (1),
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.BR convert (1).
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.
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.
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.SH AUTHOR
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Eric S. Raymond <esr@thyrsus.com>, based on a recipe by W. Richard Stevens.
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.
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.\" Local Variables:
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.\" mode: nroff
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.\" End:
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