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MathModePlugin

Description

This plugin allows you to include mathematics in a topic, with a format very similar to LaTeX. The external program latex2html is used to generate gif (or png) images from the math markup, and the image is then included in the page. The first time a particular expression is rendered, you will notice a lag as latex2html is being run on the server. Once rendered, the image is saved as an attached file for the page, so subsequent viewings will not require re-renders. When you remove a math expression from a page, its image is deleted.

Note that this plugin is called MathModePlugin, not LaTeXPlugin, because the only piece of LaTeX implemented is rendering of images of mathematics.

Syntax Rules

<latex [attr="value"]* > formula </latex>

generates an image from the contained formula. In addition attribute-value pairs may be specified that are passed to the resulting img html tag. The only exeptions are the following attributes which take effect in the latex rendering pipeline:
  • size: the latex font size; possible values are tiny, scriptsize, footnotesize, small, normalsize, large, Large, LARGE, huge or Huge; defaults to %LATEXFONTSIZE%
  • color: the foreground color of the formula; defaults to %LATEXFGCOLOR%
  • bgcolor: the background color; defaults to %LATEXBGCOLOR%

The formula will be displayed using a math latex environment by default. If the formula contains a latex linebreak (\\) then a multline environment of amsmath is used instead. If the formula contains an alignment sequence (& = &) then an eqnarray environment is used.

Note that the old notation using %$formula$% and %\[formula\]% is still supported but are deprecated.

If you might want to recompute the images cached for the current page then append ?refresh=on to its url, e.g. click here to refresh the formulas in the examples below.

Examples

The following will only display correctly if this plugin is installed and configured correctly.
<latex title="this is an example">
  \int_{-\infty}^\infty e^{-\alpha x^2} dx = \sqrt{\frac{\pi}{\alpha}}
</latex>
\int_{-\infty}^\infty e^{-\alpha x^2} dx = \sqrt{\frac{\pi}{\alpha}}

<latex>
  {\cal P} & = & \{f_1, f_2, \ldots, f_m\} \\
  {\cal C} & = & \{c_1, c_2, \ldots, c_m\} \\
  {\cal N} & = & \{n_1, n_2, \ldots, n_m\}
</latex>

{\cal P} & = & \{f_1, f_2, \ldots, f_m\} \ {\cal C} & = & \{c_1, c_2, \ldots, c_m\} \ {\cal N} & = & \{n_1, n_2, \ldots, n_m\}

<latex title="Calligraphics" color="orange">
  \cal
  A, B, C, D, E, F, G, H, I, J, K, L, M, \\
  \cal
  N, O, P, Q, R, S, T, U, V, W, X, Y, Z
</latex>

\cal A, B, C, D, E, F, G, H, I, J, K, L, M, \ \cal N, O, P, Q, R, S, T, U, V, W, X, Y, Z

<latex>
  \sum_{i_1, i_2, \ldots, i_n} \pi * i + \sigma
</latex>

\sum_{i_1, i_2, \ldots, i_n} \pi * i + \sigma

This is \cal A new inline test.

Greek letters
\alpha \alpha \theta \theta
\beta \beta \iota \iota
\gamma \gamma \kappa \kappa
\delta \delta \lambda \lambda
\epsilon \epsilon \mu \mu
\zeta \zeta \nu \nu
\eta \eta \xi \xi

Plugin Installation Instructions

You do not need to install anything in the browser to use this extension. The following instructions are for the administrator who installs the extension on the server.

Open configure, and open the "Extensions" section. Use "Find More Extensions" to get a list of available extensions. Select "Install".

If you have any problems, or if the extension isn't available in configure, then you can still install manually from the command-line. See http://foswiki.org/Support/ManuallyInstallingExtensions for more help.

Configuration

There are a set of configuration variables that an be set in different places. All of the below variables can be set in your LocalSite.cfg file like this:
$Foswiki::cfg{MathModePlugin}{<Name>} = <value>;
Some of the below variables can only be set this way, some of the may be overridden by defining the respective preference variable.

Name Preference Variable Default
HashCodeLength   32
  length of the hash code. If you switch to a different hash function, you will likely have to change this
ImagePrefix   '_MathModePlugin_'
  string to be prepended to any auto-generated image
ImageType %LATEXIMAGETYPE% 'png'
  extension of the image type; possible values are 'gif' and 'png'
Latex2Img   '.../tools/MathModePlugin_latex2img'
  the command to convert a latex formula to an image
LatexPreamble %LATEXPREAMBLE% '\usepackage{latexsym}'
  latex preamble to include additional packages (e.g. \usepackage{mathptmx} to change the math font) ; note, that the packages amsmath and color are loaded too as they are obligatory
ScaleFactor %LATEXSCALEFACTOR% 1.2
  factor to scale images
LatexFGColor %LATEXFGCOLOR% black
  default text color
LatexBGColor %LATEXBGCOLOR% white
  default background color
LatexFontSize %LATEXFONTSIZE% normalsize
  default font size

Plugin Info

Plugin Author: Graeme Lufkin, Foswiki:Main/MichaelDaum
Copyright ©: 2002 Graeme Lufkin, gwl@u.washington.edu, 2006-2014, Michael Daum http://michaeldaumconsulting.com
License: GPL (GNU General Public License)
Release: 4.04
Version: 4.04
Change History:  
18 Mar 2014: make sure the directory is present when caching images
19 Mar 2011: added Config.spec and DEPENDENCIES to ease installation and configuration; improved compatibility to run this plugin on various Foswiki engines
23 Apr 2009: converted to foswiki plugin
07 Jan 2009: certified for foswiki/compat; removed deprecated endRenderingHandler
07 Dec 2007: replaced templfile with mktemp in the latex2img helper script
13 Nov 2007: fixed plugin on 4.2
18 Dec 2006: only use one bgcolor
02 Oct 2006: don't fail on hierarchical webs; backwards compatible tempfile cleanup
31 Aug 2006: added NO_PREFS_IN_TOPIC; using xcolor instead of color latex package now to be able to specify colors in html typical codes; default preamble uses latexsym now
07 Aug 2006: switched from latex2html to latex+dvipng+convert; added size, color, bgcolor to <latex> tag; rendering pngs by default now; reworked plugin settings; added a latex2img shell script; returning full latex error report
04 Aug 2006: major rewrite; fixed security issues by using the sandbox feature and creating tempfiles properly; added new <latex>...</latex> tag to support multiline formulas; better configurability; better error reporting; fixed issues where images have not been cleaned up regularly; speedup don't clean orphaned images during view but during save; speedup by adding lazy compilation and initialization; implemented a postRenderingHandler for T* V4; prevent auto-generated images stored in pub from being auto-attached using T* V4
03 Apr 2002: Initial version
CPAN Dependencies: none
Other Dependencies: LaTeX, dvipng, ImageMagick
Perl Version: 5.8
Plugin Home: Foswiki:Extensions/MathModePlugin
Support: Foswiki:Support/MathModePlugin
Topic revision: r13 - 28 Aug 2014, MichaelDaum
 
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