EQN2GRAPH
Section: User Commands (1)
Updated: 4 November 2014
Index
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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 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
u+2n
-
-
/usr/share/groff/1.22.3/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).
AUTHORS
Eric S. Raymond <
esr@thyrsus.com>.
This documentation is released to the public domain.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- FILES
-
- ENVIRONMENT
-
- BUGS
-
- SEE ALSO
-
- AUTHORS
-
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