.TH pic2graph @MAN1EXT@ "@MDATE@" "groff @VERSION@"
.SH Name
pic2graph \- convert a
.I pic
diagram into a cropped image
.
.
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.\" Legal Terms
.\" ====================================================================
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.\" This documentation is released to the public domain.
.
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.\" ====================================================================
.SH Synopsis
.\" ====================================================================
.
.SY pic2graph
.RB [ \-unsafe ]
.RB [ \-format\~\c
.IR output-format ]
.RB [ \-eqn\~\c
.IR delimiters ]
.RI [ convert-argument \~.\|.\|.]
.YS
.
.
.SY pic2graph
.B \-\-help
.YS
.
.
.SY pic2graph
.B \-v
.
.SY pic2graph
.B \-\-version
.YS
.
.
.\" ====================================================================
.SH Description
.\" ====================================================================
.
.I pic2graph
reads a
.MR @g@pic @MAN1EXT@
program from the standard input and writes an image file,
by default in Portable Network Graphics (PNG) format,
to the standard output.
.
It furthermore translates
.MR @g@eqn @MAN1EXT@
constructs, so it can be used for generating images of mathematical
formulae.
.
.
.PP
The input PIC code should
.I not
be wrapped with the
.B .PS
and
.BR .PE / .PF
macros that normally guard it within
.MR groff @MAN1EXT@
documents.
.
.
.\" FIXME: How old?  This text hasn't been touched since 2008 at latest.
.\" Older versions of
.\" .I \%convert
.\" will produce a black-on-white graphic; newer ones may produce a
.\" black-on-transparent graphic.
.
.PP
Arguments not recognized by
.I pic2graph
are passed to the ImageMagick or GraphicsMagick program
.MR convert 1 .
.
.
By specifying these, you can give your image a border,
.\" Transparent backgrounds are the default in 2018.
.\" force the background transparent,
set the image's pixel density,
or perform other useful transformations.
.
.
.PP
The output image is clipped using
.IR \%convert 's
.B \-trim
option to the smallest possible bounding box that contains all the black
pixels.
.
.
.\" ====================================================================
.SH Options
.\" ====================================================================
.
.B \-\-help
displays a usage message,
while
.B \-v
and
.B \-\-version
show version information;
all exit afterward.
.
.TP
.BI \-eqn\~ delimiters
Use
.I delimiters
as the opening and closing
characters that delimit
.I @g@eqn
directives;
the default is \(lq$$\(rq.
.
The option argument
.I delimiters
should be a two-character string,
but an empty string (\(dq\(dq) is accepted as a directive to disable
.I @g@eqn
processing.
.
.
.TP
.BI \-format\~ output-format
Write the image in
.IR output-format ,
which must be understood by
.IR \%convert ;
the default is PNG.
.
.
.TP
.B \-unsafe
Run
.I groff
in
.I unsafe
mode, enabling the PIC command
.B sh
to execute arbitrary Unix shell commands.
.
The
.I groff
default is to forbid this.
.
.
.\" ====================================================================
.SH Environment
.\" ====================================================================
.
.TP
.I \%GROFF_TMPDIR
.TQ
.I \%TMPDIR
.TQ
.I TMP
.TQ
.I TEMP
These environment variables are searched in the given order to determine
the directory where temporary files will be created.
.
If none are set,
.I /tmp
is used.
.
.
.\" ====================================================================
.SH Authors
.\" ====================================================================
.
.I pic2graph
was written by
.MT esr@\:thyrsus\:.com
Eric S.\& Raymond
.ME ,
based on a recipe by W.\& Richard Stevens.
.
.
.\" ====================================================================
.SH "See also"
.\" ====================================================================
.
W.\& Richard Stevens,
.UR http://\:www\:.kohala\:.com/\:start/\:troff/\:pic2html\:.html
.I Turning PIC into HTML
.UE
.
.
.PP
.MR eqn2graph @MAN1EXT@ ,
.MR grap2graph @MAN1EXT@ ,
.MR @g@pic @MAN1EXT@ ,
.MR @g@eqn @MAN1EXT@ ,
.MR groff @MAN1EXT@ ,
.MR convert 1
.
.
.\" Restore compatibility mode (for, e.g., Solaris 10/11).
.cp \n[*groff_pic2graph_1_man_C]
.do rr *groff_pic2graph_1_man_C
.
.
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