/**
* function render_image
* Create the image and place it in the proper place
* @param string $texcode The LaTeX code to render
* @param integer $post_id The post id
* @param integer $commend_id The commend id if a comment
* @return string The image filename
*/
private function render_image($texcode, $post_id, $comment_id = null)
{
$this->error_texcode = rtrim($texcode, '/') . '/';
$tmp = Options::get('jLaTeX__tmp');
//Make sure the tmp directory exists
if (!is_dir($tmp)) {
mkdir($tmp, 0755, true);
}
$filename = md5($texcode);
//Put the formula in the latex document template
$latex_document = sprintf(Options::get('jLaTeX__template'), $texcode);
//Set the textwidth of the document
$textwidth = round(Options::get('jLaTeX__imagewidth') / Options::get('jLaTeX__imagedpi'), 2);
$latex_document = preg_replace('/\\\\begin{document}/si', "\\\\setlength{\\\\textwidth}{" . $textwidth . "in}\n\\\\begin{document}", $latex_document);
//Create the temproary TEX file
file_put_contents($tmp . $filename . '.tex', $latex_document);
//Create the temprorary DVI file
$command = Options::get('jLaTeX__latex') . ' --interaction=nonstopmode ' . $filename . '.tex';
if ($this->do_command($command, $tmp) === false) {
return false;
}
//Convert dvi file to png using dvipng
$command = Options::get('jLaTeX__dvipng') . ' ' . $filename . '.dvi -pp 1 -D ' . Options::get('jLaTeX__imagedpi') . ' -T tight -o ' . $filename . '.png';
if ($this->do_command($command, $tmp) === false) {
return false;
}
//Store the file in cache
$file = $tmp . $filename . '.png';
$group = 'jLaTeX';
$name = $post_id . '-' . $comment_id . '-' . md5($texcode);
RenderCache::put(array($group, $name), $file, 60 * 60 * 24 * 7, true);
}
