Section: User Commands (1)
Updated: 4 November 2014
pic2graph - convert a PIC diagram into a cropped image
Reads a PIC program as input; produces an image file (by default in
Portable Network Graphics format) suitable for the Web as output.
constructs, so it can be used for generating images of mathematical
PIC is a rather expressive graphics minilanguage suitable for
producing box-and-arrow diagrams of the kind frequently used in
technical papers and textbooks.
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 PIC descriptions are procedural and object-based, they are
both compact and easy to modify.
The PIC language is fully documented in
Making Pictures With GNU PIC,
a document which is part of the
Your input PIC code should
be wrapped with the .PS and .PE macros that normally guard it within
The output image will be clipped to the smallest possible bounding box
that contains all the black pixels.
Older versions of
will produce a black-on-white graphic; newer ones may produce a
By specifying command-line options to be passed to
you can give it a border, force the background transparent, set the
image's pixel density, or perform other useful transformations.
This program uses
and the ImageMagick
These programs must be installed on your system and accessible on your
in the 'unsafe' mode enabling the PIC macro
to execute arbitrary commands.
The default is to forbid this.
- -format fmt
Specify an output format; the default is PNG (Portable Network Graphics).
Any format that
can emit is supported.
- -eqn delim
Change the fencepost characters that delimit
This option requires an argument, but an empty string is accepted as a
directive to disable
Command-line switches and arguments not listed above are passed to
The directory in which temporary files will be created.
If this is not set
searches the environment variables
(in that order).
Otherwise, temporary files will be created in
Due to changes in the behavior of ImageMagick
that are both forward and backward-incompatible,
mismatches between your
versions may produce zero-sized or untrimmed output images.
For this version of
you will need a version of
that supports the
option; older versions of
which no longer has trimming behavior.
This documentation is released to the public domain.
Eric S. Raymond
based on a recipe by W. Richard Stevens.