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Latexrender and dvonn boards

By lieven

In order to blog a bit about Dvonn-strategy, I made myself a simple Dvonn LaTeX-template which works very well on paper but which gets mutilated by Latexrender, for example the first situation of the looks like

~\xymatrix@=.3cm @!C @R=.7cm{ & & \Black{2} \connS & & \bull{d}{5} \conn & & \bull{e}{5} \conn & & \bull{f}{5} \conn & & \bull{g}{5} \conn & & \bull{h}{5} \conn & & \SWhite \connS & & \SWhite \connS & & \SWhite \conneS & & \\ & \bull{b}{4} \conn & & \SBlack \connS & & \Black{6} \connS & & \bull{e}{4} \conn& & \bull{f}{4} \conn & & \bull{g}{4} \conn & & \bull{h}{4} \conn & & \SWhite \connS & & \SWhite \connS & & \SWhite \conneS & \\ \SBlack \connbeginS & & \SBlack \connS & & \BDvonn{7} \connS & & \bull{d}{3} \conn & & \SBlack \connS & & \BDvonn{6} \connS & & \bull{g}{3} \conn & & \bull{h}{3} \conn & & \Dvonn \connS & & \SWhite \connS & & \SWhite \connendS \\ & \Black{5} \connbeginS & & \bull{b}{2} \conn & & \SBlack \connS & & \bull{d}{2} \conn & & \bull{e}{2} \conn & & \bull{f}{2} \conn & & \bull{g}{2} \conn & & \bull{h}{2} \conn & & \SWhite \connS & & \SWhite \connendS & \\ & & \bull{a}{1} \con & & \bull{b}{1} \con & & \Black{5} \conS & & \bull{d}{1} \con & & \bull{e}{1} \con & & \bull{f}{1} \con & & \bull{g}{1} \con & & \bull{h}{1} \con & & \White{2} & &}

The reason behind this unwanted clipping is that Latexrender uses convert to take the relevant part of a ps-page containing only the TeXed formula on an empty page by performing clipping and then converts it into a GIF-file (or any other format you desire). The obvious way round this is to enlarge my template by adding two additional rows and columns and putting visible nonsense there (such as dots) to enlarge the relevant part so that no clipping is done of essential info. But then (1) the picture generated becomes even larger than that above and (2) I don’t want you to see the extra nonsensical dots… The essential line in the class.latexrender.php file is

$command = $this->convertpath.” -density “.$this->formuladensity.
” -trim -transparent \”#FFFFFF\” “.$this->tmpfilename.”.ps “.
$this->tmpfilename.”.”.$this->imageformat; 

         So

I needed to delve into the manual pages for the convert command of the ImageMagick-package. To my surprise, the -trim option (which I thought to adjust somewhat by adding parameters) doesn’t exist! Still, I got around my second problem using the crop option and around the first by using the very useful geometry option. The latter is also useful if you find that the size of the output of Latexrender is not compatible with the size of your regular text. Of course you can amend this somewhat by using the extarticle documentclass (as suggested) but if you want to further adjust it, use for example

-geometry 86%

to size the output to exactly 86% (or whatever you need). So, whenever I want to do some Dvonn-blogging from now on I’ll change my class.latexrender.php file as follows

$command = $this->convertpath.” -crop 0×0-10% -crop 0×0+10% -density “.$this->formuladensity. ” -geometry 80% -transparent \”#FFFFFF\” “.$this->tmpfilename.”.ps “.
$this->tmpfilename.”.”.$this->imageformat;

which produces the output

\xymatrix@=.3cm @R=.7cm{.& & & & & & & & & & & & & \\ & & & \Black{2} \connS & & \bull{d}{5} \conn & & \bull{e}{5} \conn & & \bull{f}{5} \conn & & \bull{g}{5} \conn & & \bull{h}{5} \conn & & \SWhite \connS & & \SWhite \connS & & \SWhite \conneS & & & \\ & & \bull{b}{4} \conn & & \SBlack \connS & & \Black{6} \connS & & \bull{e}{4} \conn& & \bull{f}{4} \conn & & \bull{g}{4} \conn & & \bull{h}{4} \conn & & \SWhite \connS & & \SWhite \connS & & \SWhite \conneS & & \\ & \SBlack \connbeginS & & \SBlack \connS & & \BDvonn{7} \connS & & \bull{d}{3} \conn & & \SBlack \connS & & \BDvonn{6} \connS & & \bull{g}{3} \conn & & \bull{h}{3} \conn & & \Dvonn \connS & & \SWhite \connS & & \SWhite \connendS & . \\ & & \Black{5} \connbeginS & & \bull{b}{2} \conn & & \SBlack \connS & & \bull{d}{2} \conn & & \bull{e}{2} \conn & & \bull{f}{2} \conn & & \bull{g}{2} \conn & & \bull{h}{2} \conn & & \SWhite \connS & & \SWhite \connendS & & \\ & & & \bull{a}{1} \con & & \bull{b}{1} \con & & \Black{5} \conS & & \bull{d}{1} \con & & \bull{e}{1} \con & & \bull{f}{1} \con & & \bull{g}{1} \con & & \bull{h}{1} \con & & \White{2} & & & \\ . & & & & & & & & & & & & & }

which (I hope) you will find slightly better…

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Posted in games, iMath
Written on Mon, 09 January 2006 at 11:27 am
Tags: , , , , ,
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