* @author Peter Vasilevsky a.k.a. Tux-oid * @license GPLv2 */ class PhpMathPublisher { /** * @var \RL\PhpMathPublisher\Helper */ protected $helper; /** * @var int */ protected $size; /** * @var string */ protected $path; /** * Constructor * @param string $imgpath where to store images * @param string $webpath web path under which the sotred images are available * @param int $size font-size for the formula */ public function __construct($imgpath, $webpath, $size = 10) { $this->helper = new Helper(); $this->helper->setDirImg($imgpath); $this->path = $webpath; $this->size = $size; } /** * Check if the wanted image already exists in the cache * * @param string $n the base name of the image * @return int */ protected function detectImage($n) { /* Detects if the formula image already exists in the $dirImg cache directory. In that case, the function returns a parameter (recorded in the name of the image file) which allows to align correctly the image with the text. */ $dirImg = $this->helper->getDirImg(); $ret = 0; $handle = opendir($dirImg); while ($fi = readdir($handle)) { $info = pathinfo($fi); if ($fi != "." && $fi != ".." && $info["extension"] == "png" && preg_match("#^math#", $fi)) { list(, $v, $name) = explode("_", $fi); if ($name == $n) { $ret = $v; break; } } } closedir($handle); return $ret; } /** * Creates the formula image (if the image is not in the cache) and returns the html code. * * @param string $text the formula * @return string */ public function mathImage($text) { $dirImg = $this->helper->getDirImg(); $nameImg = md5(trim($text) . $this->size) . '.png'; $v = $this->detectImage($nameImg); if ($v == 0) { //the image doesn't exist in the cache directory. we create it. $v = $this->renderImage($text, $dirImg . "/math_%s_" . $nameImg); } $vAlign = $v - 1000; return ''; } /** * Creates an image for the given formula at the given place * * @param string $text the formula * @param string $file where to write the file to (full path). Use %s to have the vertical alignment included * @return int the alignment + 1000 */ public function renderImage($text, $file) { $formula = new MathExpression($this->helper->tableExpression(trim($text)), $this->helper); $formula->draw($this->size); //1000+baseline ($v) is recorded in the name of the image $v = 1000 - imagesy($formula->image) + $formula->verticalBased + 3; $file = sprintf($file, $v); imagepng($formula->image, $file); return $v; } /** * @param $text * @return mixed|string */ public function mathFilter($text) { $text = stripslashes($text); $this->size = max($this->size, 10); $this->size = min($this->size, 24); preg_match_all("|(.*?)|", $text, $regs, PREG_SET_ORDER); foreach ($regs as $math) { $t = str_replace('', '', $math[0]); $t = str_replace('', '', $t); $code = $this->mathImage(trim($t)); $text = str_replace($math[0], $code, $text); } return $text; } /** * @param \RL\PhpMathPublisher\Helper $helper */ public function setHelper($helper) { $this->helper = $helper; } /** * @return \RL\PhpMathPublisher\Helper */ public function getHelper() { return $this->helper; } /** * @param string $path */ public function setPath($path) { $this->path = $path; } /** * @return string */ public function getPath() { return $this->path; } /** * @param int $size */ public function setSize($size) { $this->size = $size; } /** * @return int */ public function getSize() { return $this->size; } }