.\" $Id: grap2graph.man,v 1.3 2003/10/28 07:46:23 wlemb Exp $
.\" This documentation is released to the public domain.
.
.
.TH GRAP2GRAPH 1 "31 December 2010" "Groff Version 1.21"
.IX grap2graph
.SH NAME
grap2graph \- convert a grap diagram into a cropped bitmap image
.
.
.SH SYNOPSIS
.B grap2graph
[
.B \-unsafe
]
[
.BI \-resolution\  M\fR|\fPMxN
]
[
.BI \-format\  fmt
]
.
.
.SH DESCRIPTION
Reads a grap program as input; produces an image file (by default in
Portable Network Graphics format) suitable for the Web as output.
For a description of the grap language, see
.BR grap (1).
.P
Your graph specification should \fInot\fR be wrapped with the \&.G1 and
\&.G2 macros that normally guard it within
.BR groff (1)
macros.
.P
The output image will be a black-on-white graphic clipped to the
smallest possible bounding box that contains all the black pixels.
By specifying command-line options to be passed to 
.BR convert (1)
you can give it a border, set the background transparent, set the
image's pixel density, or perform other useful transformations.
.P
This program uses 
.BR grap (1),
.BR pic (1),
.BR groff (1),
and the ImageMagick 
.BR convert (1)
program.
These programs must be installed on your system and accessible on your
$PATH for \fBgrap2graph\fR to work.
.
.
.SH OPTIONS
.TP
.B \-unsafe
Run 
.BR pic (1)
and
.BR groff (1)
in the `unsafe' mode enabling the PIC macro
.B sh
to execute arbitrary commands.
The default is to forbid this.
.TP
.BI \-format\  fmt
Specify an output format; the default is PNG (Portable Network Graphics).
Any format that
.BR convert (1)
can emit is supported.
.PP
Command-line switches and arguments not listed above are passed to
.BR convert (1).
.
.
.SH ENVIRONMENT
.TP
.B GROFF_TMPDIR
The directory in which temporary files will be created.
If this is not set
.B grap2graph
searches the environment variables
.BR \%TMPDIR ,
.BR TMP ,
and
.B TEMP
(in that order).
Otherwise, temporary files will be created in
.BR /tmp .
.
.
.SH "SEE ALSO"
.BR pic2graph (1),
.BR eqn2graph (1),
.BR pic (1),
.BR groff (1),
.BR gs (1),
.BR convert (1).
.
.
.SH AUTHOR
Eric S. Raymond <esr@thyrsus.com>
.
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