# Description of the TikZ Sphinx Extension

This extension to Sphinx enables the use of the PGF/TikZ LaTeX package to draw nice pictures. (See CTAN or sourceforge; the manual is, e.g., here. Also have a look at contributions such as pgfplots.)

Use the extension at your own risk. Anything might change in future versions without further notice.

## Prerequisites and Configuration

### Prerequisites

This extension relies on two software packages being installed on your computer:

1. latex with the tikz and the amsmath packages
2. A software package that is able to convert a PDF to an image. Currently, this extension supports four different ways of doing this conversion. We call them conversion "suites" and list for each suite what must be installed on your computer: (Only one such suite need be installed.)
• pdf2svg suite: pdf2svg
• Netpbm suite: pdftoppm (part of the Poppler pdf library) and pnmtopng (part of the Netpbm package)
• ImageMagick suite: pdftoppm (part of the Poppler pdf library) and convert (part of the ImageMagick package)
• GhostScript suite: ghostscript

### Ubuntu Linux

For Ubuntu Linux you roughly have to make sure that the following packages are installed:

1. texlive and texlive-pictures (and maybe more LaTeX packages)
2. Depending on the chosen conversion suite the following package(s) have to be installed:
• pdf2svg suite: pdf2svg
• Netpbm suite: poppler-utils and netpbm
• ImageMagick suite: poppler-utils and imagemagick
• GhostScript suite: ghostscript

### Mac OS X

For Mac OS X a possible way of getting this extension working is as follows:

1. Install the MacTeX LaTeX distribution which per default comes with the tikz package.
2. To install one of the conversion suites you can install homebrew and then use homebrew to install the package(s) listed under B. as above for Ubuntu Linux.

### Windows

For Windows do the following:

1. Install the MiKTeX LaTeX distribution and include the tikz package when installing.

2. Depending on the chosen conversion suite, you have to install the following:

• pdf2svg suite:

Get the Windows binaries from GitHub copy all the files to some directory and add this directory to the PATH environment variable.

• Netpbm suite:

If you don't want to install the full packages above, you can copy the following files to some directory and add this directory to the PATH environment variable:

From Xpdf:

• pdftoppm

From NetPbm:

• pnmtopng.exe
• libnetpbm10.dll
• libpng13.dll
• rgb.txt

Also, you need to create a new environment variable RGBDEF=C:\TikzSphinx\rgb.txt assuming you copy the files to the C:\TikzSphinx directory.

• ImageMagick suite:

Install the Xpdf package (same as for the Netpbm suite) and install ImageMagick from here.

• GhostScript suite:

Get the GhostScript binary from here, copy it to some directory and add this directory to the PATH environment variable.

### Configuration

If you have installed the Tikz Sphinx extension e.g. using PyPI, then you have to load the extension in the Sphinx project configuration file conf.py by:

extensions = ['sphinxcontrib.tikz']

Additionally, the following configuration values are supported:

• Choose the image processing ‹suite›, either 'pdf2svg', 'Netpbm', 'ImageMagick', 'GhostScript' ('pdf2svg' by default):

tikz_proc_suite = ‹suite›

Note

• If you want your documentation to be built on http://readthedocs.org, you have to choose GhostScript.
• All suites produce png images, excepted 'pdf2svg' which produces svg.
• Enable/disable transparent graphics (enabled by default):

tikz_transparent = ‹True or False›

• Add ‹string› to the LaTeX preamble used for building the TikZ picture:

tikz_latex_preamble = ‹string›

• Add \usetikzlibrary{‹string›} to the LaTeX preamble used for building the TikZ picture:

tikz_tikzlibraries = ‹string›

Note

If you want to use the latex target, then you have to take care to include in tikz_libraries any ‹tikz libraries› given to the libs option of the tikz directive (see :ref:usage)

Note

If you want to make use of the TikZ externalization library for the LaTeX build output, then you may want to change the line:

LATEXOPTS =

in Sphinx LaTeX Makefile (/usr/share/sphinx/texinputs/Makefile) to:

LATEXOPTS = "-shell-escape"

## Usage

The extension adds a tikz-directive and a tikz-role.

The tikz-directive can be used in two ways:

.. tikz:: ‹tikz code, potentially broken
across lines›
:libs: ‹tikz libraries›
:stringsubst:

or:

.. tikz:: ‹caption, potentially broken
across lines›
:libs: ‹tikz libraries›
:stringsubst:

‹tikz code, potentially broken
across lines›

The ‹caption› is optional, but if present it is printed as a picture caption below the picture.

The :libs: option expects its argument ‹tikz libraries› to be a comma separated list of Tikz libraries to use. If you want to build the LaTeX target then make sure to add these libraries to the configuration value tikz_tikzlibraries in conf.py.

The :stringsubst: option enables the following string substitution in the ‹tikz code›: Before processing the ‹tikz code› the string $wd or$(wd) is replaced by the project root directory. This is convenient when referring to some source file in the LaTeX code.

The ‹tikz code› is code according to the TikZ LaTeX package. It behaves as if inside a tikzpicture environment. The presence of \begin{tikzpicture} and \end{tikzpicture} is optional.

Alternatively to providing the ‹tikz code›, the :include: option can be used to import the code from a file:

.. tikz::‹caption, potentially broken
across lines›
:libs: ‹tikz libraries›
:include: ‹filename›
:stringsubst:

The tikz-role is used as follows:

:tikz:‹tikz code›

The ‹tikz code› is code according to the Tikz LaTeX package. It behaves as if inside a \tikz macro.

## Examples

Note

These examples only render in a Sphinx project with a proper configuration of the Tikz Sphinx extension.

.. tikz:: [>=latex',dotted,thick] \draw[->] (0,0) -- (1,1) -- (1,0)
-- (2,0);
:libs: arrows
.. tikz:: An Example Directive with Caption

\draw[thick,rounded corners=8pt]
(0,0)--(0,2)--(1,3.25)--(2,2)--(2,0)--(0,2)--(2,2)--(0,0)--(2,0);
An example role :tikz:[thick] \node[blue,draw] (a) {A};
\node[draw,dotted,right of=a] {B} edge[<-] (a);

Example of a Tikz picture included from a file:

## Caveats

If you use the tikz directive inside of a table or a sidebar and you specify a caption then the LaTeX target built by the sphinx builder will not compile. This is because, as soon as you specify a caption, the tikzpicture environment is set inside a figure environment and hence it is a float and cannot live inside a table or another float.

If you enable :stringsubst: and you happen to have any LaTeX math expression starting with wd (i.e., you would like to write $wd ... then you must insert some white space, e.g.,$w d ... to prevent string substitution.