function TexOutput($expression, $graphic=false) {
global $CFG;
$output = '';
$latex = new latex();
// first check if it is likely to work at all
$output .= "<h3>Checking executables</h3>\n";
$executables_exist = true;
if (is_file($CFG->filter_tex_pathlatex)) {
$output .= "latex executable ($CFG->filter_tex_pathlatex) is readable<br />\n";
}
else {
$executables_exist = false;
$output .= "<b>Error:</b> latex executable ($CFG->filter_tex_pathlatex) is not readable<br />\n";
}
if (is_file($CFG->filter_tex_pathdvips)) {
$output .= "dvips executable ($CFG->filter_tex_pathdvips) is readable<br />\n";
}
else {
$executables_exist = false;
$output .= "<b>Error:</b> dvips executable ($CFG->filter_tex_pathdvips) is not readable<br />\n";
}
if (is_file($CFG->filter_tex_pathconvert)) {
$output .= "convert executable ($CFG->filter_tex_pathconvert) is readable<br />\n";
}
else {
$executables_exist = false;
$output .= "<b>Error:</b> convert executable ($CFG->filter_tex_pathconvert) is not readable<br />\n";
}
// knowing that it might work..
$md5 = md5($expression);
$output .= "<p>base filename for expression is '$md5'</p>\n";
// temporary paths
$tex = "$latex->temp_dir/$md5.tex";
$dvi = "$latex->temp_dir/$md5.dvi";
$ps = "$latex->temp_dir/$md5.ps";
$img = "$latex->temp_dir/$md5.{$CFG->filter_tex_convertformat}";
// put the expression as a file into the temp area
$expression = html_entity_decode($expression);
$output .= "<p>Processing TeX expression:</p><pre>$expression</pre>\n";
$doc = $latex->construct_latex_document($expression);
$fh = fopen($tex, 'w');
fputs($fh, $doc);
fclose($fh);
// cd to temp dir
chdir($latex->temp_dir);
// step 1: latex command
$cmd = "$CFG->filter_tex_pathlatex --interaction=nonstopmode $tex";
$output .= execute($cmd);
// step 2: dvips command
$cmd = "$CFG->filter_tex_pathdvips -E $dvi -o $ps";
$output .= execute($cmd);
// step 3: convert command
$cmd = "$CFG->filter_tex_pathconvert -density 240 -trim $ps $img ";
$output .= execute($cmd);
if (!$graphic) {
echo($output);
} else {
send_file($img, "$md5.{$CFG->filter_tex_convertformat}");
}
}
function TexOutput($expression, $graphic = false)
{
global $CFG;
$output = '';
$latex = new latex();
// first check if it is likely to work at all
$output .= "<h3>Checking executables</h3>\n";
$executables_exist = true;
if (is_file($CFG->filter_tex_pathlatex)) {
$output .= "latex executable ({$CFG->filter_tex_pathlatex}) is readable<br />\n";
} else {
$executables_exist = false;
$output .= "<b>Error:</b> latex executable ({$CFG->filter_tex_pathlatex}) is not readable<br />\n";
}
if (is_file($CFG->filter_tex_pathdvips)) {
$output .= "dvips executable ({$CFG->filter_tex_pathdvips}) is readable<br />\n";
} else {
$executables_exist = false;
$output .= "<b>Error:</b> dvips executable ({$CFG->filter_tex_pathdvips}) is not readable<br />\n";
}
if (is_file($CFG->filter_tex_pathconvert)) {
$output .= "convert executable ({$CFG->filter_tex_pathconvert}) is readable<br />\n";
} else {
$executables_exist = false;
$output .= "<b>Error:</b> convert executable ({$CFG->filter_tex_pathconvert}) is not readable<br />\n";
}
// knowing that it might work..
$md5 = md5($expression);
$output .= "<p>base filename for expression is '{$md5}'</p>\n";
// temporary paths
$tex = "{$latex->temp_dir}/{$md5}.tex";
$dvi = "{$latex->temp_dir}/{$md5}.dvi";
$ps = "{$latex->temp_dir}/{$md5}.ps";
$img = "{$latex->temp_dir}/{$md5}.{$CFG->filter_tex_convertformat}";
// put the expression as a file into the temp area
$expression = html_entity_decode($expression);
$output .= "<p>Processing TeX expression:</p><pre>{$expression}</pre>\n";
$doc = $latex->construct_latex_document($expression);
$fh = fopen($tex, 'w');
fputs($fh, $doc);
fclose($fh);
// cd to temp dir
chdir($latex->temp_dir);
// step 1: latex command
$cmd = "{$CFG->filter_tex_pathlatex} --interaction=nonstopmode {$tex}";
$output .= execute($cmd);
// step 2: dvips command
$cmd = "{$CFG->filter_tex_pathdvips} -E {$dvi} -o {$ps}";
$output .= execute($cmd);
// step 3: convert command
$cmd = "{$CFG->filter_tex_pathconvert} -density 240 -trim {$ps} {$img} ";
$output .= execute($cmd);
if (!$graphic) {
echo $output;
} else {
if (file_exists($img)) {
send_file($img, "{$md5}.{$CFG->filter_tex_convertformat}");
} else {
echo "Error creating image, see command execution output for more details.";
}
}
}
function TexOutput($expression, $graphic = false)
{
global $CFG;
$output = '';
$latex = new latex();
// first check if it is likely to work at all
$output .= "<h3>Checking executables</h3>\n";
$executables_exist = true;
if (is_file($CFG->filter_tex_pathlatex)) {
$output .= "latex executable ({$CFG->filter_tex_pathlatex}) is readable<br />\n";
} else {
$executables_exist = false;
$output .= "<b>Error:</b> latex executable ({$CFG->filter_tex_pathlatex}) is not readable<br />\n";
}
if (is_file($CFG->filter_tex_pathdvips)) {
$output .= "dvips executable ({$CFG->filter_tex_pathdvips}) is readable<br />\n";
} else {
$executables_exist = false;
$output .= "<b>Error:</b> dvips executable ({$CFG->filter_tex_pathdvips}) is not readable<br />\n";
}
if (is_file($CFG->filter_tex_pathconvert)) {
$output .= "convert executable ({$CFG->filter_tex_pathconvert}) is readable<br />\n";
} else {
$executables_exist = false;
$output .= "<b>Error:</b> convert executable ({$CFG->filter_tex_pathconvert}) is not readable<br />\n";
}
// knowing that it might work..
$md5 = md5($expression);
$output .= "<p>base filename for expression is '{$md5}'</p>\n";
// temporary paths
$tex = "{$latex->temp_dir}/{$md5}.tex";
$dvi = "{$latex->temp_dir}/{$md5}.dvi";
$ps = "{$latex->temp_dir}/{$md5}.ps";
$gif = "{$latex->temp_dir}/{$md5}.gif";
// put the expression as a file into the temp area
$expression = stripslashes($expression);
$expression = html_entity_decode($expression);
$output .= "<p>Processing TeX expression:</p><pre>{$expression}</pre>\n";
$doc = $latex->construct_latex_document($expression);
$fh = fopen($tex, 'w');
fputs($fh, $doc);
fclose($fh);
// cd to temp dir
chdir($latex->temp_dir);
// step 1: latex command
$cmd = "{$CFG->filter_tex_pathlatex} --interaction=nonstopmode {$tex}";
$output .= execute($cmd);
// step 2: dvips command
$cmd = "{$CFG->filter_tex_pathdvips} -E {$dvi} -o {$ps}";
$output .= execute($cmd);
// step 3: convert command
$cmd = "{$CFG->filter_tex_pathconvert} -density 240 -trim {$ps} {$gif} ";
$output .= execute($cmd);
if (!$graphic) {
echo $output;
} else {
$lastmodified = filemtime($gif);
$lifetime = 86400;
$filetype = 'image/gif';
$image = "{$md5}.gif";
header("Last-Modified: " . gmdate("D, d M Y H:i:s", $lastmodified) . " GMT");
header("Expires: " . gmdate("D, d M Y H:i:s", time() + $lifetime) . " GMT");
header("Cache-control: max_age = {$lifetime}");
// a day
header("Pragma: ");
header("Content-disposition: inline; filename={$image}");
header("Content-length: " . filesize($gif));
header("Content-type: {$filetype}");
readfile("{$gif}");
}
}
