function wikiplugin_equation($data, $params)
{
if (empty($data)) {
return '';
}
extract($params, EXTR_SKIP);
if (empty($size)) {
$size = 100;
}
$latexrender_path = getcwd() . "/lib/equation";
include_once $latexrender_path . "/class.latexrender.php";
$latexrender_path_http = "lib/equation";
$latex = new LatexRender($latexrender_path . "/pictures", $latexrender_path_http . "/pictures", $latexrender_path . "/tmp");
$latex->_formula_density = 120 * $size / 100;
extract($params, EXTR_SKIP);
$data = html_entity_decode(trim($data), ENT_QUOTES);
$url = $latex->getFormulaURL($data);
$alt = "~np~" . $data . "~/np~";
if ($url != false) {
$html = "<img src=\"{$url}\" alt=\"{$alt}\" style=\"vertical-align:middle\">";
} else {
$html = "__~~#FF0000:Unparseable or potentially dangerous latex formula. Error {$latex->_errorcode} {$latex->_errorextra}~~__";
}
return $html;
}
function latex_content($text)
{
global $config;
// --------------------------------------------------------------------------------------------------
// adjust this to match your system configuration
$latexrender_path = dirname(__FILE__);
$latexrender_path_http = $config["base_path"] . "/functions/latexrender";
// --------------------------------------------------------------------------------------------------
include_once $latexrender_path . "/class.latexrender.php";
preg_match_all("#\\[tex\\](.*?)\\[/tex\\]#si", $text, $tex_matches);
$latex = new LatexRender($latexrender_path . "/pictures", $latexrender_path_http . "/pictures", $latexrender_path . "/tmp");
for ($i = 0; $i < count($tex_matches[0]); $i++) {
$pos = strpos($text, $tex_matches[0][$i]);
$latex_formula = $tex_matches[1][$i];
// if you use htmlArea to input the text then uncomment the next 6 lines
$latex_formula = str_replace("&", "&", $latex_formula);
$latex_formula = str_replace("&", "&", $latex_formula);
$latex_formula = str_replace(" ", " ", $latex_formula);
$latex_formula = str_replace("<BR>", "", $latex_formula);
$latex_formula = str_replace("<P>", "", $latex_formula);
$latex_formula = str_replace("</P>", "", $latex_formula);
$url = $latex->getFormulaURL($latex_formula);
$alt_latex_formula = htmlentities($latex_formula, ENT_QUOTES);
$alt_latex_formula = str_replace("\r", " ", $alt_latex_formula);
$alt_latex_formula = str_replace("\n", " ", $alt_latex_formula);
if ($url != false) {
$text = substr_replace($text, "<img src='" . $url . "' title='" . $alt_latex_formula . "' alt='" . $alt_latex_formula . "' align=absmiddle>", $pos, strlen($tex_matches[0][$i]));
} else {
$text = substr_replace($text, "[Unparseable or potentially dangerous latex formula. Error {$latex->_errorcode} {$latex->_errorextra}]", $pos, strlen($tex_matches[0][$i]));
}
}
return $text;
}
/**
* Callback function for preg_replace_callback (LaTeX replacement).
* Returns replacement image for LaTeX code.
* @param $matches (string) array containing matches: $matches[0] is the complete match, $matches[1] the match for the first subpattern enclosed in '(...)' (the LaTeX code)
* @return string replacement HTML code string to include the equivalent LaTeX image.
*/
function F_latex_callback($matches)
{
require_once '../../shared/code/tce_latexrender.php';
$latex = new LatexRender();
$latex_code = unhtmlentities($matches[1]);
// get image URL
$imgurl = $latex->getFormulaURL($latex_code);
if ($imgurl) {
// alternative text to image
$alt_latex = '[LaTeX]' . "\n" . htmlentities($latex_code, ENT_QUOTES);
$alt_latex = str_replace("\r", ' ', $alt_latex);
$alt_latex = str_replace("\n", ' ', $alt_latex);
// XHTML code for image
$newtext = '<img src="' . $imgurl . '" alt="' . $alt_latex . '" class="tcecode" />';
} else {
$newtext = '[LaTeX: ERROR ' . $latex->getErrorCode() . ']';
}
return $newtext;
}
