function tex2image($texexp, $md5, $return = false) { global $CFG; if (!$texexp) { echo 'No tex expresion specified'; return; } $texexp = '\\Large ' . $texexp; $image = $md5 . ".gif"; $filetype = 'image/gif'; if (!file_exists("{$CFG->dataroot}/filter/algebra")) { make_upload_directory("filter/algebra"); } $pathname = "{$CFG->dataroot}/filter/algebra/{$image}"; if (file_exists($pathname)) { unlink($pathname); } $commandpath = filter_tex_get_executable(true); $cmd = filter_tex_get_cmd($pathname, $texexp); system($cmd, $status); if ($return) { return $image; } if (file_exists($pathname)) { send_file($pathname, $image); } else { $ecmd = "{$cmd} 2>&1"; echo `{$ecmd}` . "<br />\n"; echo "The shell command<br />{$cmd}<br />returned status = {$status}<br />\n"; if ($status == 4) { echo "Status corresponds to illegal instruction<br />\n"; } else { if ($status == 11) { echo "Status corresponds to bus error<br />\n"; } else { if ($status == 22) { echo "Status corresponds to abnormal termination<br />\n"; } } } if (file_exists($commandpath)) { echo "File size of mimetex executable {$commandpath} is " . filesize($commandpath) . "<br />"; echo "The file permissions are: " . decoct(fileperms($commandpath)) . "<br />"; if (function_exists("md5_file")) { echo "The md5 checksum of the file is " . md5_file($commandpath) . "<br />"; } else { $handle = fopen($commandpath, "rb"); $contents = fread($handle, 16384); fclose($handle); echo "The md5 checksum of the first 16384 bytes is " . md5($contents) . "<br />"; } } else { echo "mimetex executable {$commandpath} not found!<br />"; } echo "Image not found!"; } }
/** * Function to replace @@PLUGINFILE@@ references to image files by local file:// URLs. * * @param string $input The input string (Moodle HTML) * @param int $contextid The context ID. * @param string $filearea The filearea used to locate the image files. * @param int $itemid The itemid used to locate the image files. * @param float $kfactor A magnification factor. * @param int $maxwidth The maximum width in pixels for images. * @return string The result string */ public function fix_image_paths($input, $contextid, $filearea, $itemid, $kfactor, $maxwidth, $format = 'pdf') { global $CFG, $DB; require_once $CFG->dirroot . '/filter/tex/lib.php'; require_once $CFG->dirroot . '/filter/tex/latex.php'; $fs = get_file_storage(); $output = $input; $strings = preg_split("/<img/i", $output); $output = array_shift($strings); foreach ($strings as $string) { // Define a unique temporary name for each image file. srand(microtime() * 1000000); $unique = str_replace('.', '', microtime(true) . '_' . rand(0, 100000)); $imagetag = substr($string, 0, strpos($string, '>')); $attributestrings = explode(' ', $imagetag); $attributes = array(); foreach ($attributestrings as $attributestring) { $valuepair = explode('=', $attributestring); if (count($valuepair) > 1 && strlen(trim($valuepair[0])) > 0) { $attributes[strtolower(trim($valuepair[0]))] = str_replace('"', '', str_replace("'", '', $valuepair[1])); } } if (array_key_exists('width', $attributes) && $attributes['width'] > 0) { $imagewidth = $attributes['width']; } else { $imagewidth = 0; } if (array_key_exists('height', $attributes) && $attributes['height'] > 0) { $imageheight = $attributes['height']; } else { $imageheight = 0; } $imagefilename = ''; if (array_key_exists('src', $attributes) && strlen($attributes['src']) > 10) { $pluginfilename = $attributes['src']; $imageurl = false; $teximage = false; $pluginfile = false; $parts = preg_split("!{$CFG->wwwroot}/filter/tex/pix.php/!", $pluginfilename); if (preg_match('!@@PLUGINFILE@@/!', $pluginfilename)) { $pluginfilename = str_replace('@@PLUGINFILE@@/', '', $pluginfilename); $pathparts = pathinfo($pluginfilename); if (!empty($pathparts['dirname']) && $pathparts['dirname'] != '.') { $filepath = '/' . $pathparts['dirname'] . '/'; } else { $filepath = '/'; } if ($imagefile = $fs->get_file($contextid, 'question', $filearea, $itemid, $filepath, rawurldecode($pathparts['basename']))) { $imagefilename = $imagefile->get_filename(); // Copy image content to temporary file. $pathparts = pathinfo($imagefilename); $file = $CFG->dataroot . "/temp/offlinequiz/" . $unique . '.' . strtolower($pathparts["extension"]); clearstatcache(); if (!check_dir_exists($CFG->dataroot . "/temp/offlinequiz", true, true)) { print_error("Could not create data directory"); } $imagefile->copy_content_to($file); $pluginfile = true; } else { $output .= 'Image file not found ' . $pathparts['dirname'] . '/' . $pathparts['basename']; } } else { if (count($parts) > 1) { $teximagefile = $CFG->dataroot . '/filter/tex/' . $parts[1]; if (!file_exists($teximagefile)) { // Create the TeX image if it does not exist yet. $convertformat = $DB->get_field('config_plugins', 'value', array('plugin' => 'filter_tex', 'name' => 'convertformat')); $md5 = str_replace(".{$convertformat}", '', $parts[1]); if ($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 = $DB->get_field('config_plugins', 'value', array('plugin' => 'filter_tex', 'name' => 'density')); $background = $DB->get_field('config_plugins', 'value', array('plugin' => 'filter_tex', 'name' => 'latexbackground')); $texexp = $texcache->rawtext; // The entities are now decoded before inserting to DB. $latexpath = $latex->render($texexp, $md5, 12, $density, $background); if ($latexpath) { copy($latexpath, $teximagefile); $latex->clean_up($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; $cmd = filter_tex_get_cmd($teximagefile, $texexp); system($cmd, $status); } } } $pathparts = pathinfo($teximagefile); $file = $CFG->dataroot . "/temp/offlinequiz/" . $unique . '.' . strtolower($pathparts["extension"]); clearstatcache(); if (!check_dir_exists($CFG->dataroot . "/temp/offlinequiz", true, true)) { print_error("Could not create data directory"); } copy($teximagefile, $file); $teximage = true; } else { // Image file URL. $imageurl = true; } } $factor = 2; // Per default show images half sized. if (!$imageurl) { if (!file_exists($file)) { $output .= get_string('imagenotfound', 'offlinequiz', $file); } else { // Use imagemagick to remove alpha channel and reduce resolution of large images. $imageinfo = getimagesize($file); $filewidth = $imageinfo[0]; $fileheight = $imageinfo[1]; $pathconvert = $DB->get_field('config_plugins', 'value', array('plugin' => 'filter_tex', 'name' => 'pathconvert')); if (file_exists($pathconvert)) { $newfile = $CFG->dataroot . "/temp/offlinequiz/" . $unique . '_c.png'; $resize = ''; $percent = round(200000000 / ($filewidth * $fileheight)); if ($percent < 100) { $resize = ' -resize ' . $percent . '%'; } $handle = popen($pathconvert . ' ' . $file . $resize . ' -background white -flatten +matte ' . $newfile, 'r'); pclose($handle); $this->tempfiles[] = $file; $file = $newfile; if ($percent < 100) { $imageinfo = getimagesize($file); $filewidth = $imageinfo[0]; $fileheight = $imageinfo[1]; } } if ($imagewidth > 0) { if ($imageheight > 0) { $fileheight = $imageheight; } else { $fileheight = $imagewidth / $filewidth * $fileheight; } $filewidth = $imagewidth; } if ($teximage) { if ($format == 'pdf') { $factor = $factor * 1.2; } else { $factor = $factor * 1.5; } } $width = round($filewidth / ($kfactor * $factor)); if ($width > $maxwidth) { $width = $maxwidth; } $height = round($fileheight * $width / $filewidth); // Add filename to list of temporary files. $this->tempfiles[] = $file; // In answer texts we want a line break to avoid the picture going above the line. if ($filearea == 'answer') { $output .= '<br/>'; } // Finally, add the image tag for tcpdf. $output .= '<img src="file://' . $file . '" align="middle" width="' . $width . '" height="' . $height . '"/>'; } } else { if ($imagewidth > 0 && $imageheight > 0) { $width = $imagewidth / ($kfactor * $factor); if ($width > $maxwidth) { $width = $maxwidth; } $height = $imageheight * $width / $imagewidth; $output .= '<img src="' . $pluginfilename . '" align="middle" width="' . $width . '" height="' . $height . '"/>'; } else { $output .= '<img src="' . $pluginfilename . '" align="middle"/>'; } } } $output .= substr($string, strpos($string, '>') + 1); } return $output; }
$pathname = $CFG->dataroot . '/filter/algebra/' . $image; } else { print_error('invalidarguments', 'error'); } if (!file_exists($pathname)) { $md5 = str_replace('.gif', '', $image); if ($texcache = $DB->get_record('cache_filters', array('filter' => 'algebra', 'md5key' => $md5))) { if (!file_exists($CFG->dataroot . '/filter/algebra')) { make_upload_directory('filter/algebra'); } $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/algebra/algebradebug.php\">debugging script</a>"; } else { echo "Image not found!<br />"; echo "Please try the <a href=\"{$CFG->wwwroot}/filter/algebra/algebradebug.php\">debugging script</a><br />"; echo "Please turn on debug mode in site configuration to see more info here."; }
function tex2image($texexp, $return=false) { global $CFG; if (!$texexp) { echo 'No tex expresion specified'; return; } $image = md5($texexp) . ".gif"; $filetype = 'image/gif'; if (!file_exists("$CFG->dataroot/filter/tex")) { make_upload_directory("filter/tex"); } $pathname = "$CFG->dataroot/filter/tex/$image"; if (file_exists($pathname)) { unlink($pathname); } $texexp = '\Large '.$texexp; $commandpath = filter_tex_get_executable(true); $cmd = filter_tex_get_cmd($pathname, $texexp); system($cmd, $status); if ($return) { return $image; } if (file_exists($pathname)) { send_file($pathname, $image); } else if (debugging()) { $ecmd = "$cmd 2>&1"; echo `$ecmd` . "<br />\n"; echo "The shell command<br />$cmd<br />returned status = $status<br />\n"; if ($status == 4) { echo "Status corresponds to illegal instruction<br />\n"; } else if ($status == 11) { echo "Status corresponds to bus error<br />\n"; } else if ($status == 22) { echo "Status corresponds to abnormal termination<br />\n"; } if (file_exists($commandpath)) { echo "File size of mimetex executable $commandpath is " . filesize($commandpath) . "<br />"; echo "The file permissions are: " . decoct(fileperms($commandpath)) . "<br />"; if (function_exists("md5_file")) { echo "The md5 checksum of the file is " . md5_file($commandpath) . "<br />"; } else { $handle = fopen($commandpath,"rb"); $contents = fread($handle,16384); fclose($handle); echo "The md5 checksum of the first 16384 bytes is " . md5($contents) . "<br />"; } } else { echo "mimetex executable $commandpath not found!<br />"; } echo "Image not found!"; } else { echo "Can not output detailed information due to security concerns, please turn on debug mode first."; } }