NAME¶
eqn2graph - convert an EQN equation into a cropped image
SYNOPSIS¶
eqn2graph [
-unsafe ] [
-format fmt ]
DESCRIPTION¶
Reads an EQN equation (one line) as input; produces an image file (by default in
Portable Network Graphics format) suitable for the Web as output.
Your input EQN code should
not have the .EQ/.EN preamble that that
normally precedes it within
groff(1) macros; nor do you need to have
dollar-sign or other delimiters around the equation.
The output image will be clipped to the smallest possible bounding box that
contains all the black pixels. Older versions of
convert(1) will
produce a black-on-white graphic; newer ones may produce a
black-on-transparent graphic. By specifying command-line options to be passed
to
convert(1) you can give it a border, force the background
transparent, set the image's pixel density, or perform other useful
transformations.
This program uses
eqn(1),
groff(1), and the ImageMagick
convert(1) program. These programs must be installed on your system and
accessible on your $PATH for
eqn2graph to work.
OPTIONS¶
- -unsafe
- Run groff(1) in the `unsafe' mode enabling the PIC macro sh
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 convert(1) can emit is supported.
Command-line switches and arguments not listed above are passed to
convert(1).
FILES¶
- /usr/share/groff/1.22.2/tmac/eqnrc
- The eqn(1) initialization file.
ENVIRONMENT¶
- GROFF_TMPDIR
- The directory in which temporary files will be created. If this is not set
eqn2graph searches the environment variables TMPDIR,
TMP, and TEMP (in that order). Otherwise, temporary files
will be created in /tmp.
BUGS¶
Due to changes in the behavior of ImageMagick
convert(1) that are both
forward and backward-incompatible, mismatches between your
eqn2graph
and
convert(1) versions may produce zero-sized or untrimmed output
images. For this version of
eqn2graph you will need a version of
convert(1) that supports the
-trim option; older versions of
eqn2graph used
-crop 0x0, which no longer has trimming
behavior.
SEE ALSO¶
pic2graph(1),
grap2graph(1),
eqn(1),
groff(1),
gs(1),
convert(1).
AUTHOR¶
Eric S. Raymond <esr@thyrsus.com>.