JuelichImage.php

gehe zur Dokumentation dieser Datei

<?php
require_once TM_PATH . 'constants.php';
require_once TM_PATH . 'juelich/JuelichGlobals.php';

class JuelichImage {

  var $type    = "text/plain";  
  var $image;                   
  var $success = false;         
  function JuelichImage() {
    $data =& getDataInstance();
    $path =  explode('/', $data->getPathInfo());
    if (count($path) != 3) {
      include_once TM_PATH . 'juelich/web/JuelichError.php';
      $error = new JuelichError;
      $error->printError(5,
                         'Image-URL hat falsche Parameterzahl: '
                         . implode('/', $path));
      exit();
    }
    $mode = $path[0];
    $id   = $path[1];

    if ($mode == 'p' || $mode == 'ps' || $mode == 'z') {
      $this->getImage($mode, $id);
    }
    else {
      include_once TM_PATH . 'juelich/web/JuelichError.php';
      $error = new JuelichError;
      $error->printError(5,
                         'Image-URL, unbekannter Modus: '
                         . $mode);
      exit();
    }
    if ($this->success) {
      $this->type = 'image/jpeg';
    }
    return;
  }

  function getContentType() {
    return $this->type;
  }

  function deliverImage() {
    if ($this->success) {
      imagejpeg($this->image, '', 100);
    }
  }

  function getImage($mode, $id) {
    $imgFs = IMG_CACHE_DIR . '/' . $mode . $id . '.jpg';
    $imgDb = 'p' . $id;
    if ($mode == 'z') {
      $imgDb = 'z' . $id;
    }
    if (file_exists($imgFs)) {
      $this->image = imagecreatefromjpeg($imgFs);
      if (empty($this->image)) {
        include_once TM_PATH . 'juelich/web/JuelichError.php';
        $error = new JuelichError;
        $error->printError(4,
                           'Image kann nicht erzeugt werden (FS): '
                           . $imgFs);
        exit();
      }
      $this->success = true;
      return;
    }
    $db =& getDbReaderInstance();
    $iData = array();
    $db->getImage($imgDb, $iData);
    if (empty($iData)) {
      include_once TM_PATH . 'juelich/web/JuelichError.php';
      $error = new JuelichError;
      $error->printError(5,
                         'Image nicht in der DB enthalten: '
                         . $imgDb);
      exit();
    }
    $this->image = imagecreatefromstring($iData['i_data']);
    if (empty($this->image)) {
      $error->printError(4,
                         'Image kann nicht erzeugt werden (DB): '
                         . $imgDb);
      exit();
    }
    if ($mode == 'ps') {
      $this->success = $this->makeThumbnail();
    }
    $this->success = imagejpeg($this->image, $imgFs, 100);
    return;
  }

  function makeThumbnail() {
    $imgBig = $this->image;
    $wBig   = imagesx($imgBig);
    $hBig   = imagesy($imgBig);
   
    $wThumb = 0;
    $hThumb = 0;
    $need   = false;
    if ($wBig >= $hBig && $wBig > 100) {
      $wThumb = 100;
      $hThumb = round($hBig / ($wBig / 100), 0);
      $need   = true;
    }
    elseif ($hBig > 100) {
      $wThumb = round($wBig / ($hBig / 100), 0);
      $hThumb = 100;
      $need   = true;
    }
    if (!$need) {
      return true;
    }
    $imgThumb = imagecreatetruecolor($wThumb, $hThumb);
    imagecopyresampled($imgThumb,
                       $imgBig,
                       0,
                       0,
                       0,
                       0,
                       $wThumb,
                       $hThumb,
                       $wBig,
                       $hBig);
    imagedestroy($imgBig);
    $this->image = $imgThumb;
    return true;
  }

}

?>

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