latex-gnuplot takes a gnuplot script which outputs to a LaTeX terminal
(epslatex, pdflatex, cairolatex, ...), runs gnuplot, embeds the
resulting .tex file containing the title, axis labels, etc., into a predefined
LaTeX template, and finally runs a LaTeX engine and subsequent conversions to
the desired output format.
Typical usage scenarios include submissions to journals (e.g. APS journals)
which require figures to be submitted in a self-contained format, i.e. as a
standalone file (e.g. eps) including all axis labels, keys, and titles.
latex-gnuplot allows you to comply with this constraint whilst still
benefitting from LaTeX typesetting for mathematical formulae. Using an
appropriate preamble file (see below), the type in the figure can be made to
look exactly as in the main LaTeX document, as though it was \input directly.
Another possible use case lies in the generation of SVG figures for seamless
embedding on the web while preserving vector graphics.
Before either gnuplot or LaTeX are invoked, the input-gnuplot-file and any
optional data-files are copied in a temporary directory to not pollute the
working dir with auxiliary files. The final eps or pdf is copied back to the
working directory. The temporary directory is subsequently deleted; specifying
the option --no-cleanup will forego this, allowing to inspect any intermediate
products.
To install the latex-gnuplot script, simply clone the repository and run the
install shell script:
$ git clone https://github.com/jgreitemann/latex-gnuplot.git
$ sudo ./latex-gnuplot/install.sh
The default install location is /usr/local/. To deviate from that, specify the
--prefix option, e.g. for a user-local installation:
$ ./latex-gnuplot/install.sh --prefix $HOME/.local
By default, the accompanying man page is generated using Pandoc and installed
in the appropriate place ($prefix/share/man/man1/). To skip this, specify
--skip-man.
To uninstall, rerun the install script with the -u option.
The example gnuplot script example/photo_luminescense.gp plots a bunch of
photo-luminescense data in different colors and displays a matching label next
to each line. It also makes use of LaTeX math in axis labels. This example is
courtesy of Hagen Wierstorf of gnuplotting.org with slight modifications.
To achieve the colored labels, we utilize the \textcolor{colorname}{text}
command provided by the xcolor package. To that end, we add a file
preamble.tex to use that package and define the colors:
\usepackage{xcolor}
\definecolor{axes}{HTML}{808080}
\definecolor{line1}{HTML}{800000}
% ...Then, in order to create the plot shown below, we run
$ latex-gnuplot --pdf --svg -P preamble.tex photo_luminescense.gp *.dat
Note that we specify both PDF and SVG output, enter the preamble, and list the gnuplot script and all the data files (expanded by the shell from a glob pattern).
If we deemed the font size too large, we could also inject a TeX command to
change it without touching any of the input files by adding the flag
--inject '\\small'. Note that backslashs need to be escaped.
A full list of options is documented in the man page.
The --engine flag can be used to specify the LaTeX engine used to typeset the
figure. The possible engines are not contraint by this script. Any command like
latex, pdflatex, xelatex, ... is a valid choice as long as it produces
native DVI or PDF output.
Since some templates require certain engines to be typeset properly, templates (see below) may include a comment of the form:
% TeX-engine: xelatex
This follows the conventions of the Emacs AUCTeX mode. If the -la- token is
omitted (e.g. xetex) it will be inserted automatically. Explicit specification
of the --engine flag will override this preset.
If neither --engine is specified, nor a template preset is defined, (or the
engine token was set to default), pdflatex will be used as the engine.
The template files are looked up from a hierarchy of directories in the following order:
$HOME/.latex-gnuplot/$PREFIX/share/latex-gnuplot//usr/local/share/latex-gnuplot//usr/share/latex-gnuplot/
where $PREFIX is the install prefix that was set by passing the --prefix
option to the install.sh script.
For example, the default template is named article; specifying this
(--template article) will invoke the file article.tex which is installed to
the install prefix path. Template are supposed to use LaTeX packages or other
facilities to the effect of the preview package which allows to extract the
figure cropped to its dimensions.
A number of substitutions are performed on the template. At the very least, templates should include a line
\input{THEFILENAME}
where THEFILENAME is a token that is replaced by the name of the LaTeX
terminal's output file.
Templates can be further customized by replacing the token THEPREAMBLE with
the contents of a separate .tex file via the --preamble flag. Lastly, LaTeX
commands can be injected directly into the LaTeX source using the --inject
flag and will replace the token THEINJECTION.
Copyright (C) 2018 Jonas Greitemann
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.
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