A simple class to generate thumbnail linked to the propel model. sfThumbnailPlugin is needed and sfPropelPlugin (of course)

Override two methods create one, add a constant and go !

Give me your opinion !

You need to add into peer class (MediaPeer in exemple) :

<?php
 
class MediaPeer extends BaseMediaPeer
{  
  // directory of file (under uploads file)
  const IMAGE_DIR = 'images/media';
 
  // override
  public static function doDelete($values, PropelPDO $con = null)
  {
    // delete every image file linked
    return sfPropelThumbnail::deleteThumb($values,$con, 'Media');
  }
 
  // Configuration
  public static function getThumbConfig()
  {
 
    return  array( 'image'=>  // each fields to thumbnailize
               array(         // each thumbnail configuration for field
                    array('thumb_dir' => 'thumbnail', 'size' => array(200, 500)),
                    array('thumb_dir' => 'fullsize' , 'size' => array(500, 700), 'crop'=>true),
                    array('thumb_dir' => 'verysmall', 'size' => array(60,60)   , 'crop'=>true)
                    )
                );
  }
}
 

And into your model class (Media in exemple) :

<?php
 
class Media extends BaseMedia
{
  public function setImage($value, $thumb=true)
  {
    // if first call thumbnailize image and after put file name in the db
    if($thumb)
      sfPropelThumbnail::generateThumbnail($value,$this ,'Media', 'image');
    else 
      parent::setImage($value);
  }
} 
 

sfPropelThumbnail

<?php
 
/*
 * @author: Simon Bonjean (sim@45-ouest.be)
 */
 
class sfPropelThumbnail {
  /*
   *  getConfiguration
   */
  protected static function getDefaultConfig($class)
  {
    $dir       = constant($class .'Peer::IMAGE_DIR');     
    $configs   = call_user_func(array($class .'Peer','getThumbConfig')); 
    return array($dir, $configs);
  }
 
  /*
   * Generate the thumbnails
   */
  public static function generateThumbnail($value,$that,$class,$fields_name)
  {
 
    // Variable 
    $upload_path = sfConfig::get('sf_upload_dir');         // Get path to upload
    list($dir, $configs) = self::getDefaultConfig($class); // Get Config and dir name
    $configs = $configs[$fields_name];                     // Get config for name
    $methode = 'set'.ucfirst($fields_name);                // Get Methode 
 
    if(empty($value)) 
    {
      // delete all thumbs
      foreach($configs as $config) {
         $thumb_dir = $config['thumb_dir'];
        if(is_file($upload_path . "/$dir/$fields_name/$thumb_dir/" . $that->getImage()))
            unlink($upload_path . "/$dir/$fields_name/$thumb_dir/" . $that->getImage() );
      }
      // Set l'image sans faire de thumb
 
      call_user_func(array($that,$methode),$value, false);
 
    } else {
      // delete old thumb
      foreach($configs as $config){
        $thumb_dir = $config['thumb_dir'];
        if(is_file($upload_path."/$dir/$fields_name/$thumb_dir/".$that->getImage()))
          unlink( $upload_path . "/$dir/$fields_name/$thumb_dir/".$that->getImage() );
      }
 
      // Set l'image sans faire de thumb 
      call_user_func(array($that,$methode),$value, false);
      // generate each thumbs
      foreach($configs as $config) {
 
        $thumb_dir = $config['thumb_dir'];
        $size      = $config['size']; 
 
 
        // CREATE DIRECTORY IF NOT EXIST !!!
 
        if(!is_dir($upload_path."/$dir/"))
            mkdir($upload_path."/$dir/");                           // base name
        if(!is_dir($upload_path."/$dir/$fields_name/"))             
            mkdir($upload_path."/$dir/$fields_name/");              // field name
        if(!is_dir($upload_path."/$dir/$fields_name/$thumb_dir/"))
            mkdir($upload_path."/$dir/$fields_name/$thumb_dir/");   // thumb name  
 
        if(isset($config['crop']) && $config['crop'] == true) {
          // Make Crop 
          self::cropImage($size[0], $size[1],
            $upload_path."/$dir/$fields_name/".$that->getImage(),
            $upload_path."/$dir/$fields_name/$thumb_dir/".$that->getImage());
        } else {
          // Make Thumb
          $thumbnail = new sfThumbnail($size[0], $size[1]);
          $thumbnail->loadFile($upload_path."/$dir/$fields_name/".$that->getImage()); 
          $thumbnail->save($upload_path."/$dir/$fields_name/$thumb_dir/".$that->getImage(), 'image/png');
        }
      }
    } 
 
  }  
 
  /*
   * delete each thumbnail when you delete binded element
   */
  public static function deleteThumb($values,PropelPDO $con, $class)
  {
    // Variable 
    list($dir, $configs) = self::getDefaultConfig($class);
    $upload_path = sfConfig::get('sf_upload_dir');
 
    if($retVal = call_user_func(array('Base' . $class .'Peer','doDelete'),$values, $con))
 
    foreach($configs as $fields_name => $fields_config) {
 
      $files = self::_getThumb($values, $class, $fields_name);
 
      if($files){     
 
        foreach($files as $file) {
          if(is_file($upload_path."/$dir/$fields_name/".$file)) {
            unlink( $upload_path . "/$dir/$fields_name/".$file );
          }
 
          foreach($fields_config as $config){
            $thumb_dir = $config['thumb_dir'];
            if(is_file($upload_path."/$dir/$fields_name/$thumb_dir/".$file)) {
              unlink( $upload_path . "/$dir/$fields_name/$thumb_dir/".$file );
            }
          }
        }
      }
    }
    return $retVal;
  }
 
  /*
   * retruive all piture
   */ 
  protected  static function _getThumb($values, $class, $fields_name){ 
    // Variable 
    $files       = false;   
    $fields_name = 'get' . ucfirst($fields_name);
 
    if ($values instanceof Criteria) {
      $tmps = call_user_func(array($class.'Peer','doSelect'), $values);
 
      foreach($tmps as $value)
        if($temp_thumb = call_user_func(array($value,$fields_name)) != '')
          $files[] = $temp_thumb;
    } elseif (get_class($values) == $class) {        
 
      if($temp_thumb = call_user_func(array($values,$fields_name))  != '')
        $files[] = $temp_thumb;
 
    } else {
      $tmps = call_user_func(array($classPeer,'retrieveByPKs'),$values);
 
      foreach($tmps as $value)
        if($temp_thumb = call_user_func(array($value,$fields_name)) != '')
          $files[] = $temp_thumb;
    }
    return $files;
  }
 
 
 
  /* 
   * This method thumbnailize image with crop option (center default)
   */
  public static function cropImage($nw, $nh, $source, $dest) { 
      $size = getimagesize($source);
      $len = strlen($source);
      $stype = substr($source,$len-3,3);
      $w = $size[0];
      $h = $size[1]; 
      switch($stype) {
          case 'gif':
            $simg = imagecreatefromgif($source);
          break;
          case 'jpg':
            $simg = imagecreatefromjpeg($source);
          break;
          case 'png':
            $simg = imagecreatefrompng($source);
          break;
      }
      $dimg = imagecreatetruecolor($nw, $nh); 
      $wm = $w/$nw;
      $hm = $h/$nh;
      $h_height = $nh/2;
      $w_height = $nw/2;
      if($w> $h) {
          $adjusted_width = $w / $hm;
          $half_width = $adjusted_width / 2;
          $int_width = $half_width - $w_height;
          imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);
      } elseif(($w <$h) || ($w == $h)) {
          $adjusted_height = $h / $wm;
          $half_height = $adjusted_height / 2;
          $int_height = $half_height - $h_height;
          imagecopyresampled($dimg,$simg,0,-$int_height,0,0,$nw,$adjusted_height,$w,$h);
      } else {
          imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
      }
      imagejpeg($dimg,$dest,150);
  }
}