Mmm.. yes, it would be to use something external..
But I recently found this page that use a real time latex parser:
http://hausheer.osola.com/latex2png
And it's source (link from that page):
http://hausheer.osola.com/software/latex2png.phps
This is that PHP code:
Code: Select all
<?php
/*
* PHP script to turn a LaTeX string into PNG, GIF, EPS, or JPEG
*
* Copyright (c) 2005 - 2008 David Hausheer
*
* This script 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 2 of the License, or
* (at your option) any later version.
*
* This script 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 script; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
$LATEX = "openin_any=p /usr/bin/latex";
$DVIPNG = "/usr/bin/dvipng";
$DVIPS = "/usr/bin/dvips";
$EPSTOOL = "/usr/bin/epstool";
$CONVERT = "/usr/bin/convert"; // ImageMagick
$TEMPDIR = "/tmp";
$TEMPNAM = "eqn";
$IMGTYPES = array("png" => "image/png",
"gif" => "image/gif",
"eps" => "application/postscript",
"jpg" => "image/jpeg");
$source = $_POST['source'];
$type = $_POST['type'];
$density = $_POST['density'];
$preview = $_POST['preview'];
$transparent = $_POST['transparent'];
$inline = $_POST['inline'];
if($source && get_magic_quotes_gpc()) $source = stripslashes($source);
if($source) $dynurl = $_SERVER['SCRIPT_URI']."/".str_replace("=","-",base64_encode($source))."/$density/".(($transparent && ($type=="png" || $type=="gif") || $preview && $type=="eps") ? 1 : 0)."/result.$type";
if($source && ($type=="eps" || $inline=="")) { header("Location: $dynurl"); exit(); }
list($encsource,$encdens,$enctrans,$enctype) = explode('/', substr($_SERVER['PATH_INFO'],1));
if ($encsource) $source = base64_decode(str_replace("=","-",$encsource));
if ($encdens) $density = $encdens;
if ($enctrans==1) { $transparent = "yes"; $preview = "yes"; }
if ($enctype) $type = substr($enctype, 7);
if($enctype) {
$tmpname = tempnam($TEMPDIR, $TEMPNAM);
$density = $density + 0;
$density = (1200 < $density) ? 1200 : (($density < 75) ? 75 : $density);
$source = strtr($source,"\n\r\t\0"," ");
$tex = "\documentclass[fleqn]{article} \usepackage{amssymb,amsmath,bm,color} \usepackage[latin1]{inputenc} \begin{document} \\"."thispagestyle{empty} \mathindent0cm \parindent0cm $source \end{document}";
$handle = fopen($tmpname.".tex", "w");
fputs($handle, $tex);
fclose($handle);
exec("cd $TEMPDIR; $LATEX -interaction=nonstopmode ".substr($tmpname,5));
if (isset($IMGTYPES[$type])) {
header('Content-Type: '.$IMGTYPES[$type]);
header("Date: ".gmdate("D, d M Y H:i:s")." GMT");
header("Expires: ".gmdate("D, d M Y H:i:s",time() + 3600)." GMT");
header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
if ($transparent && ($type=="png" || $type=="gif")) $bg = "Transparent"; else $bg = "White";
if ($type=="gif" || $type=="jpg") passthru("$DVIPNG -q -T tight -bg $bg -D $density -o /dev/stdout $tmpname.dvi | $CONVERT png:- $type:-");
else if ($type=="png") passthru("$DVIPNG -q -T tight -bg $bg -D $density -o /dev/stdout $tmpname.dvi");
else if ($type="eps") { exec("$DVIPS -q -E $tmpname.dvi -o $tmpname.eps");
if ($preview) exec("$EPSTOOL --dpi $density -t6p $tmpname.eps $tmpname.eps");
readfile($tmpname.".eps");
}
}
exec("rm $tmpname*");
} else {
echo "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n";
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head><title>Latex2png, latex2gif, latex2eps, latex2jpg</title>
</head>
<body>
<h1>Latex2png, latex2gif, latex2eps, latex2jpg</h1>
<hr/>
<p>Latex2png is a webtool to convert LaTeX code into different graphic formats (PNG, GIF, EPS, or JPEG).</p>
<p>This is convenient if you, e.g., want to insert a LaTeX formula as PNG into MS PowerPoint, or as EPS into Adobe FrameMaker.</p>
<p><b>Usage:</b> Enter your LaTeX code (e.g. a math formula), choose the desired output type and press "submit":</p>
<div style="position:relative">
<script type="text/javascript" src="/latexeditor/functions.js"></script>
<script type="text/javascript" src="/latexeditor/menu_items.js"></script>
<script type="text/javascript">
<!--//
new menu (MENU_ITEMS);
//-->
</script>
<?php
$displaycode = "\begin{displaymath}\n\oint_{\partial A}\vec H\;\cdot\mathrm{d}\vec s=\iint_A\vec J\;\cdot\mathrm{d}\vec A+\frac{\mathrm{d}}{\mathrm{d} t}\iint_A\vec D\;\cdot\mathrm{d}\vec A\n\end{displaymath}";
echo "<form id=\"latex2png\" method=\"post\" action=\"".$_SERVER['SCRIPT_NAME']."\">\n";
echo "<p><textarea name=\"source\" rows=\"10\" cols=\"60\">".($source ? $source : $displaycode)."</textarea></p>";
echo "<p><b>Type:</b> ";
foreach ($IMGTYPES as $key => $value) {
echo " <input type=\"radio\" name=\"type\" value=\"$key\" ".($type=="$key" || ($type=="" && $key=="png") ? "checked=\"checked\"" : "")."/> ".strtoupper($key);
}
echo "</p>";
echo "<p><b>Options:</b> ";
echo "<input type=\"text\" name=\"density\" value=\"".($density ? $density : 300)."\" size=\"3\"/> dpi (75-1200) ";
echo "<input type=\"checkbox\" name=\"preview\" value=\"yes\"/> with TIFF preview (EPS only) ";
echo "<input type=\"checkbox\" name=\"transparent\" value=\"yes\" ".($transparent=="yes" ? "checked=\"checked\"" : "")."/> transparent (PNG/GIF only) ";
echo "<input type=\"checkbox\" name=\"inline\" value=\"yes\" ".($inline=="yes" ? "checked=\"checked\"" : "")."/> show inline (PNG/GIF/JPG only)";
echo "</p>";
echo "<p><input type=\"submit\" value=\"submit\"/> <input type=\"reset\" value=\"reset\"/></p>";
echo "</form>\n";
echo "</div>\n";
if ($dynurl) {
echo "<p>To save the image, click the right mouse button over it and select \"Save Image As...\".</p>";
echo "<img style=\"padding:2px".($transparent ? "; background-color:#cccccc" : "")."\" src=\"$dynurl\"/>\n";
}
?>
</body></html>
<?php
}
?>
There is the link of the Latexeditor too if you need it (I really don't know how to mix all them to make a functional module, but I'm sure it would not be hard).
So, maybe you can check it, and make an extra module page called for example latex2img.php to use it as image for the replacement when some label [tex]..[/tex] appears
, and I'm sure it will be fast.
What do you say? I don't pretend you to add TeX for sure, because maybe you can't add this functionality because the resources, although I think it doesn't require much of them.. but if you can, It would be soo great to have TeX in Project Euler!! =)
