Editing API:EPrints/Latex (section)

===texstring_to_png===

 $imgfile = EPrints::Latex::texstring_to_png( $session, $texstring )
Returns the location of a PNG image file containing the latex fragment <tt>$texstring</tt>. 

This uses a directory to generate and cache the images. So the system only has to go to the effort of rendering any equation once. The  directory is <tt>latexcache</tt> in the htdocs directory of the repository.

The filename of the cached png is the md5 of the latex equation as a string of hex characters. 

The images always have a white background. 

This uses the rather obvious system of creating a LaTeX file with <tt>$texstring</tt> in, running <tt>latex</tt> on it, running <tt>dvips</tt> on the  resulting DVI file to get a postscript file of a page with the  equation in the corner. Then uses GNU <tt>convert</tt> to crop the  PostScript file and turn it into a PNG.

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