You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
3.1 KiB
80 lines
3.1 KiB
<?php
|
|
// This function fetches math. images from the data directory
|
|
// If not, it obtains the corresponding TeX expression from the cache_tex db table
|
|
// and uses mimeTeX to create the image file
|
|
|
|
// disable moodle specific debug messages and any errors in output
|
|
define('NO_DEBUG_DISPLAY', true);
|
|
define('NO_MOODLE_COOKIES', true); // Because it interferes with caching
|
|
|
|
require_once('../../config.php');
|
|
|
|
if (!filter_is_enabled('tex')) {
|
|
print_error('filternotenabled');
|
|
}
|
|
|
|
require_once($CFG->libdir.'/filelib.php');
|
|
require_once($CFG->dirroot.'/filter/tex/lib.php');
|
|
require_once($CFG->dirroot.'/filter/tex/latex.php');
|
|
|
|
$cmd = ''; // Initialise these variables
|
|
$status = '';
|
|
|
|
$relativepath = get_file_argument();
|
|
|
|
$args = explode('/', trim($relativepath, '/'));
|
|
|
|
if (count($args) == 1) {
|
|
$image = $args[0];
|
|
$pathname = $CFG->dataroot.'/filter/tex/'.$image;
|
|
} else {
|
|
print_error('invalidarguments', 'error');
|
|
}
|
|
|
|
if (!file_exists($pathname)) {
|
|
$convertformat = get_config('filter_tex', 'convertformat');
|
|
if (strpos($image, '.png')) {
|
|
$convertformat = 'png';
|
|
}
|
|
$md5 = str_replace(".{$convertformat}", '', $image);
|
|
if ($texcache = $DB->get_record('cache_filters', array('filter'=>'tex', 'md5key'=>$md5))) {
|
|
if (!file_exists($CFG->dataroot.'/filter/tex')) {
|
|
make_upload_directory('filter/tex');
|
|
}
|
|
|
|
// try and render with latex first
|
|
$latex = new latex();
|
|
$density = get_config('filter_tex', 'density');
|
|
$background = get_config('filter_tex', 'latexbackground');
|
|
$texexp = $texcache->rawtext; // the entities are now decoded before inserting to DB
|
|
$lateximage = $latex->render($texexp, $image, 12, $density, $background);
|
|
if ($lateximage) {
|
|
copy($lateximage, $pathname);
|
|
$latex->clean_up($md5);
|
|
|
|
} else {
|
|
// failing that, use mimetex
|
|
$texexp = $texcache->rawtext;
|
|
$texexp = str_replace('<', '<', $texexp);
|
|
$texexp = str_replace('>', '>', $texexp);
|
|
$texexp = preg_replace('!\r\n?!', ' ', $texexp);
|
|
$texexp = '\Large '.$texexp;
|
|
$cmd = filter_tex_get_cmd($pathname, $texexp);
|
|
system($cmd, $status);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (file_exists($pathname)) {
|
|
send_file($pathname, $image);
|
|
} else {
|
|
if (debugging()) {
|
|
echo "The shell command<br />$cmd<br />returned status = $status<br />\n";
|
|
echo "Image not found!<br />";
|
|
echo "Please try the <a href=\"$CFG->wwwroot/filter/tex/texdebug.php\">debugging script</a>";
|
|
} else {
|
|
echo "Image not found!<br />";
|
|
echo "Please try the <a href=\"$CFG->wwwroot/filter/tex/texdebug.php\">debugging script</a><br />";
|
|
echo "Please turn on debug mode in site configuration to see more info here.";
|
|
}
|
|
}
|
|
|