issue3, first requirement checks
[phpfspot.git] / phpfspot.class.php
index e0fba5f8cb5bc7a06b00c5f83b4f6c3f8b57472e..907b6dc9592231da1cbf975e9e224eb506adffdc 100644 (file)
@@ -16,6 +16,11 @@ class PHPFSPOT {
 
    public function __construct()
    {
+      /* Check necessary requirements */
+      if(!$this->checkRequirements()) {
+         exit(1);
+      }
+
       $this->cfg = new PHPFSPOT_CFG;
 
       $this->db = new PHPFSPOT_DB(&$this, $this->cfg->fspot_db);
@@ -27,6 +32,14 @@ class PHPFSPOT {
 
       $this->get_tags();
 
+      session_start();
+
+      if(!isset($_SESSION['tag_condition']))
+         $_SESSION['tag_condition'] = 'or';
+
+      if(!isset($_SESSION['searchfor']))
+         $_SESSION['searchfor'] = '';
+
    } // __construct()
 
    public function __destruct()
@@ -36,9 +49,22 @@ class PHPFSPOT {
 
    public function show()
    {
+      $this->tmpl->assign('searchfor', $_SESSION['searchfor']);
       $this->tmpl->assign('page_title', $this->cfg->page_title);
+      $this->tmpl->assign('current_condition', $_SESSION['tag_condition']);
+
+      switch($_GET['mode']) {
+         case 'showpi':
+            if(isset($_GET['tags'])) {
+               $_SESSION['selected_tags'] = split(',', $_GET['tags']);
+            }
+            break;
+      }
+
+      $this->tmpl->assign('content_page', 'welcome.tpl');
       $this->tmpl->show("index.tpl");
 
+
    } // show()
 
    private function get_tags()
@@ -57,6 +83,10 @@ class PHPFSPOT {
          $tag_id = $row['id'];
          $tag_name = $row['name'];
 
+         /* check if config requests to ignore this tag */
+         if(in_array($row['name'], $this->cfg->hide_tags))
+            continue;
+
          $this->tags[$tag_id] = $tag_name; 
          $this->avail_tags[$count] = $tag_id;
 
@@ -86,7 +116,7 @@ class PHPFSPOT {
 
    public function showPhoto($photo)
    {
-      $all_photos = $this->getAllTagPhotos();
+      $all_photos = $this->getPhotoSelection();
 
       foreach($all_photos as $all_photo) {
          
@@ -103,18 +133,47 @@ class PHPFSPOT {
          }
       }
 
-
       $details = $this->get_photo_details($photo);
-      $meta = $this->get_meta_informations($this->translate_path($details['directory_path']) ."/". $details['name']);
-      $info = getimagesize($this->translate_path($details['directory_path']) ."/thumbs/". $this->cfg->photo_width ."_". $details['name']);
+      $orig_path = $this->translate_path($details['directory_path']) ."/". $details['name'];
+      $thumb_path = $this->cfg->base_path ."/thumbs/". $this->cfg->photo_width ."_". $this->getMD5($photo);
+
+      if(!file_exists($orig_path)) {
+         print "Photo ". $orig_path ." does not exist!<br />\n";
+      }
+
+      if(!is_readable($orig_path)) {
+         print "Photo ". $orig_path ." is not readable for user ". get_current_user() ."<br />\n";
+      }
+
+      /* If the thumbnail doesn't exist yet, try to create it */
+      if(!file_exists($thumb_path)) {
+         $this->gen_thumb($photo, 0, 1);
+      }
+
+      $meta = $this->get_meta_informations($orig_path);
+
+      if(file_exists($thumb_path)) {
 
-      $this->tmpl->assign('width', $info[0]);
-      $this->tmpl->assign('height', $info[1]);
-      $this->tmpl->assign('c_date', $meta['DateTime']);
-      $this->tmpl->assign('madewith', $meta['Make'] ." ". $meta['Model']);
-      $this->tmpl->assign('image_name', $details['name']);
-      $this->tmpl->assign('image_url', 'phpfspot_img.php?idx='. $photo ."&amp;width=". $this->cfg->photo_width);
-      $this->tmpl->assign('image_url_full', 'phpfspot_img.php?idx='. $photo);
+         $info = getimagesize($thumb_path);
+
+         $this->tmpl->assign('description', $details['description']);
+         $this->tmpl->assign('image_name', $details['name']);
+
+         $this->tmpl->assign('width', $info[0]);
+         $this->tmpl->assign('height', $info[1]);
+         $this->tmpl->assign('ExifMadeOn', strftime("%a %x %X", $meta['FileDateTime']));
+         $this->tmpl->assign('ExifMadeWith', $meta['Make'] ." ". $meta['Model']);
+         $this->tmpl->assign('ExifOrigResolution', $meta['ExifImageWidth'] ."x". $meta['ExifImageLength']);
+         $this->tmpl->assign('ExifFileSize', round($meta['FileSize']/1024, 1));
+    
+         $this->tmpl->assign('image_url', 'phpfspot_img.php?idx='. $photo ."&amp;width=". $this->cfg->photo_width);
+         $this->tmpl->assign('image_url_full', 'phpfspot_img.php?idx='. $photo);
+
+         $this->tmpl->assign('tags', $this->get_photo_tags($photo));
+      }
+      else {
+         print "Can't open file ". $thumb_path ."\n";
+      }
 
       if($previous_img) {
          $this->tmpl->assign('previous_url', "javascript:showImage(". $previous_img .");");
@@ -130,13 +189,54 @@ class PHPFSPOT {
 
    public function getAvailableTags()
    {
-      foreach($this->avail_tags as $tag)
-      {
-         if(isset($_SESSION['selected_tags']) && in_array($tag, $_SESSION['selected_tags']))
+      $result = $this->db->db_query("
+         SELECT tag_id as id, count(tag_id) as quantity
+         FROM photo_tags
+         INNER JOIN tags t
+            ON t.id = tag_id
+         GROUP BY tag_id
+         ORDER BY t.name ASC
+      ");
+
+      $tags = Array();
+
+      while($row = $this->db->db_fetch_object($result)) {
+         $tags[$row['id']] = $row['quantity'];
+      }
+
+      // change these font sizes if you will
+      $max_size = 125; // max font size in %
+      $min_size = 75; // min font size in %
+
+      // get the largest and smallest array values
+      $max_qty = max(array_values($tags));
+      $min_qty = min(array_values($tags));
+
+      // find the range of values
+      $spread = $max_qty - $min_qty;
+      if (0 == $spread) { // we don't want to divide by zero
+         $spread = 1;
+      }
+
+      // determine the font-size increment
+      // this is the increase per tag quantity (times used)
+      $step = ($max_size - $min_size)/($spread);
+
+      // loop through our tag array
+      foreach ($tags as $key => $value) {
+
+         if(isset($_SESSION['selected_tags']) && in_array($key, $_SESSION['selected_tags']))
             continue;
 
-         // return all available (= not selected) tags
-         print "<a href=\"javascript:Tags('add', ". $tag .");\">". $this->tags[$tag] ."</a>&nbsp;";
+          // calculate CSS font-size
+          // find the $value in excess of $min_qty
+          // multiply by the font-size increment ($size)
+          // and add the $min_size set above
+         $size = $min_size + (($value - $min_qty) * $step);
+          // uncomment if you want sizes in whole %:
+         $size = ceil($size);
+
+         print "<a href=\"javascript:Tags('add', ". $key .");\" class=\"tag\" style=\"font-size: ". $size ."%;\">". $this->tags[$key] ."</a>, ";
 
       }
 
@@ -148,7 +248,7 @@ class PHPFSPOT {
       {
          // return all selected tags
          if(isset($_SESSION['selected_tags']) && in_array($tag, $_SESSION['selected_tags'])) {
-            print "<a href=\"javascript:Tags('del', ". $tag .");\">". $this->tags[$tag] ."</a>&nbsp;";
+            print "<a href=\"javascript:Tags('del', ". $tag .");\" class=\"tag\">". $this->tags[$tag] ."</a>&nbsp;";
          }
 
       }
@@ -160,7 +260,8 @@ class PHPFSPOT {
       if(!isset($_SESSION['selected_tags']))
          $_SESSION['selected_tags'] = Array();
 
-      array_push($_SESSION['selected_tags'], $tag);
+      if(!in_array($tag, $_SESSION['selected_tags']))
+         array_push($_SESSION['selected_tags'], $tag);
    
    } // addTag()
 
@@ -169,6 +270,7 @@ class PHPFSPOT {
       if(isset($_SESSION['selected_tags'])) {
          $key = array_search($tag, $_SESSION['selected_tags']);
          unset($_SESSION['selected_tags'][$key]);
+         sort($_SESSION['selected_tags']);
       }
 
    } // delTag()
@@ -179,59 +281,138 @@ class PHPFSPOT {
 
    } // resetTags()
 
-   public function getAllTagPhotos()
+   public function getPhotoSelection()
    {  
       $tagged_photos = Array();
 
-      if(isset($_SESSION['selected_tags'])) {
-         $selected = "";
-         foreach($_SESSION['selected_tags'] as $tag)
-            $selected.= $tag .",";
-         $selected = substr($selected, 0, strlen($selected)-1);
+      /* return a search result */
+      if(isset($_SESSION['searchfor']) && $_SESSION['searchfor'] != '') {
          $result = $this->db->db_query("
             SELECT DISTINCT photo_id
                FROM photo_tags pt
             INNER JOIN photos p
                ON p.id=pt.photo_id
-            WHERE pt.tag_id IN (". $selected .")
-            ORDER BY p.time ASC
+            INNER JOIN tags t
+               ON pt.tag_id=t.id
+            WHERE t.name LIKE '%". $_SESSION['searchfor'] ."%'
+               ORDER BY p.time ASC
          ");
+         while($row = $this->db->db_fetch_object($result)) {
+            array_push($tagged_photos, $row['photo_id']);
+         }
+         return $tagged_photos;
       }
-      else {
-         $result = $this->db->db_query("
-            SELECT DISTINCT photo_id
-               FROM photo_tags pt
-            INNER JOIN photos p
-               ON p.id=pt.photo_id
-            ORDER BY p.time ASC
-         ");
+
+      /* return according the selected tags */
+      if(isset($_SESSION['selected_tags']) && !empty($_SESSION['selected_tags'])) {
+         $selected = "";
+         foreach($_SESSION['selected_tags'] as $tag)
+            $selected.= $tag .",";
+         $selected = substr($selected, 0, strlen($selected)-1);
+
+         if($_SESSION['tag_condition'] == 'or') {
+            $result = $this->db->db_query("
+               SELECT DISTINCT photo_id
+                  FROM photo_tags pt
+               INNER JOIN photos p
+                  ON p.id=pt.photo_id
+               WHERE pt.tag_id IN (". $selected .")
+               ORDER BY p.time ASC
+            ");
+         }
+         elseif($_SESSION['tag_condition'] == 'and') {
+
+            /* Join together a table looking like
+
+               pt1.photo_id pt1.tag_id pt2.photo_id pt2.tag_id ...
+
+               so the query can quickly return all images matching the
+               selected tags in an AND condition
+
+            */
+
+            $query_str = "
+               SELECT DISTINCT pt1.photo_id
+                  FROM photo_tags pt1
+            ";
+
+            for($i = 0; $i < count($_SESSION['selected_tags']); $i++) {
+               $query_str.= "
+                  INNER JOIN photo_tags pt". ($i+2) ."
+                     ON pt1.photo_id=pt". ($i+2) .".photo_id
+               ";
+            }
+            $query_str.= "WHERE pt1.tag_id=". $_SESSION['selected_tags'][0];
+            for($i = 1; $i < count($_SESSION['selected_tags']); $i++) {
+               $query_str.= "
+                  AND pt". ($i+1) .".tag_id=". $_SESSION['selected_tags'][$i] ."
+               "; 
+            }
+            $result = $this->db->db_query($query_str);
+         }
+
+         while($row = $this->db->db_fetch_object($result)) {
+            array_push($tagged_photos, $row['photo_id']);
+         }
+         return $tagged_photos;
       }
 
+      /* return all available photos */
+      $result = $this->db->db_query("
+         SELECT DISTINCT photo_id
+            FROM photo_tags pt
+         INNER JOIN photos p
+            ON p.id=pt.photo_id
+         ORDER BY p.time ASC
+      ");
       while($row = $this->db->db_fetch_object($result)) {
          array_push($tagged_photos, $row['photo_id']);
       }
-
       return $tagged_photos;
 
-   } // getAllTagPhotos()
+   } // getPhotoSelection()
 
    public function showPhotoIndex()
    {
-      $photos = $this->getAllTagPhotos();
+      $photos = $this->getPhotoSelection();
+
       $count = count($photos);
 
+      if(!$_SESSION['begin_with'] || $_SESSION['begin_with'] == 0)
+         $begin_with = 0;
+      else
+         $begin_with = $_SESSION['begin_with'];
+
+      if($this->cfg->rows_per_page == 0)
+         $end_with = $count;
+      else
+         $end_with = $begin_with + ($this->cfg->rows_per_page * $this->cfg->thumbs_per_row);
+
+   
       $rows = 0;
       $cols = 0;
       $images[$rows] = Array();
+      $img_height[$rows] = Array();
+      $img_width[$rows] = Array();
 
-      for($i = 0; $i < $count; $i++) {
+      for($i = $begin_with; $i < $end_with; $i++) {
 
          $images[$rows][$cols] = $photos[$i];
 
+         $thumb_path = $this->cfg->base_path ."/thumbs/". $this->cfg->thumb_width ."_". $this->getMD5($photos[$i]);
+
+         if(file_exists($thumb_path)) {
+            $info = getimagesize($thumb_path); 
+            $img_width[$rows][$cols] = $info[0];
+            $img_height[$rows][$cols] = $info[1];
+         }
+
          if($cols == $this->cfg->thumbs_per_row-1) {
             $cols = 0;
             $rows++;
             $images[$rows] = Array();
+            $img_width[$rows] = Array();
+            $img_height[$rows] = Array();
          }
          else {
             $cols++;
@@ -241,11 +422,31 @@ class PHPFSPOT {
       // +1 for for smarty's selection iteration
       $rows++;
 
-         //$images.= "<img src=\"phpfspot_img.php?idx=". $photo ."&amp;width=". $this->cfg->thumb_width ."\" /><br />\n";
+      if(isset($_SESSION['searchfor']) && $_SESSION['searchfor'] != '')
+         $this->tmpl->assign('searchfor', $_SESSION['searchfor']);
+
+      if($this->cfg->rows_per_page != 0) {
+         $previous_start = $begin_with - ($this->cfg->rows_per_page * $this->cfg->thumbs_per_row);
+         $next_start = $begin_with + ($this->cfg->rows_per_page * $this->cfg->thumbs_per_row);
+
+         if($begin_with != 0) 
+            $this->tmpl->assign("previous_url", "javascript:showPhotoIndex(". $previous_start .");"); 
+         if($end_with < $count)
+            $this->tmpl->assign("next_url", "javascript:showPhotoIndex(". $next_start .");"); 
+      }
+
+      $current_tags = "";
+      foreach($_SESSION['selected_tags'] as $tag)
+         $current_tags.= $tag .",";
+      $current_tags = substr($current_tags, 0, strlen($current_tags)-1);
+      $extern_link = "http://". $_SERVER['SERVER_NAME'] ."/index.php?mode=showpi&tags=". $current_tags;
 
+      $this->tmpl->assign('extern_link', $extern_link);
       $this->tmpl->assign('count', $count);
       $this->tmpl->assign('width', $this->cfg->thumb_width);
       $this->tmpl->assign('images', $images);
+      $this->tmpl->assign('img_width', $img_width);
+      $this->tmpl->assign('img_height', $img_height);
       $this->tmpl->assign('rows', $rows);
       $this->tmpl->assign('columns', $this->cfg->thumbs_per_row);
       $this->tmpl->show("photo_index.tpl");
@@ -261,13 +462,24 @@ class PHPFSPOT {
          $direction = "bubbleimg_down";
 
       $details = $this->get_photo_details($photo);
+      $orig_path = $this->translate_path($details['directory_path'])  ."/". $details['name'];
 
       $image_url = "phpfspot_img.php?idx=". $photo ."&amp;width=". $this->cfg->bubble_width;
 
-      $filesize = filesize($this->translate_path($details['directory_path'])  ."/". $details['name']);
+      $filesize = filesize($orig_path);
       $filesize = rand($filesize/1024, 2);
 
-      $img = getimagesize($this->translate_path($details['directory_path'])  ."/". $details['name']);
+      if(!file_exists($orig_path)) {
+         print "Photo ". $orig_path ." does not exist!<br />\n";
+         return;
+      }
+      
+      if(!is_readable($orig_path)) {
+         print "Photo ". $orig_path ." is not readable for user ". get_current_user() ."<br />\n";
+         return;
+      }
+
+      $img = getimagesize($orig_path);
 
       $this->tmpl->assign('file_size', $filesize);
       $this->tmpl->assign('width', $img[0]);
@@ -287,61 +499,102 @@ class PHPFSPOT {
 
    } // showCredits()
 
-   public function create_thumbnail($image, $width)
+   public function create_thumbnail($orig_image, $thumb_image, $width)
    {  
-      // if thumbnail already exists, don't recreate it
-      if(file_exists(dirname($image) ."/thumbs/". $width ."_". basename($image)))
-         return;
+      if(!file_exists($orig_image))
+         return false;
+
+      $meta = $this->get_meta_informations($orig_image);
+
+      $rotate = 0;
+      $flip = false;
+
+      switch($meta['Orientation']) {
+
+         case 1:
+            $rotate = 0; $flip = false; break;
+         case 2:
+            $rotate = 0; $flip = true; break;
+         case 3:
+            $rotate = 180; $flip = false; break;
+         case 4:
+            $rotate = 180; $flip = true; break;
+         case 5:
+            $rotate = 90; $flip = true; break;
+         case 6:
+            $rotate = 90; $flip = false; break;
+         case 7:
+            $rotate = 270; $flip = true; break;
+         case 8:
+            $rotate = 270; $flip = false; break;
+      }
 
-      $src_img = @imagecreatefromjpeg($image);
+      $src_img = @imagecreatefromjpeg($orig_image);
 
-      if($src_img)
-      {  
-         /* grabs the height and width */
-         $new_w = imagesx($src_img);
-         $new_h = imagesy($src_img);
+      if(!$src_img) {
+         print "Can't load image from ". $orig_image ."\n";
+         return false;
+      }
 
-         // If requested width is more then the actual image width,
-         // do not generate a thumbnail
+      /* grabs the height and width */
+      $new_w = imagesx($src_img);
+      $new_h = imagesy($src_img);
 
-         if($width >= $new_w) {
-            imagedestroy($src_img);
-            return;
-         }
+      // If requested width is more then the actual image width,
+      // do not generate a thumbnail
+
+      if($width >= $new_w) {
+         imagedestroy($src_img);
+         return true;
+      }
+
+      /* calculates aspect ratio */
+      $aspect_ratio = $new_h / $new_w;
 
-         /* calculates aspect ratio */
-         $aspect_ratio = $new_h / $new_w;
+      /* sets new size */
+      $new_w = $width;
+      $new_h = abs($new_w * $aspect_ratio);
 
-         /* sets new size */
-         $new_w = $width;
-         $new_h = abs($new_w * $aspect_ratio);
+      /* creates new image of that size */
+      $dst_img = imagecreatetruecolor($new_w, $new_h);
 
-         /* creates new image of that size */
-         $dst_img = imagecreatetruecolor($new_w,$new_h);
+      imagefill($dst_img, 0, 0, ImageColorAllocate($dst_img, 255, 255, 255));
 
-         imagefill($dst_img, 0, 0, ImageColorAllocate($dst_img, 255, 255, 255));
+      /* copies resized portion of original image into new image */
+      imagecopyresampled($dst_img,$src_img,0,0,0,0,$new_w,$new_h,imagesx($src_img),imagesy($src_img));
 
-         /* copies resized portion of original image into new image */
-         imagecopyresampled($dst_img,$src_img,0,0,0,0,$new_w,$new_h,imagesx($src_img),imagesy($src_img));
+      /* needs the image to be flipped horizontal? */
+      if($flip) {
+         print "(FLIP)";
+         $image = $dst_img;
+         for($x = 0; $x < $new_w; $x++) {
+            imagecopy($dst_img, $image, $x, 0, $w - $x - 1, 0, 1, $h);
+         }
+      }
 
-         /* write down new generated file */
+      if($rotate) {
+         print "(ROTATE)";
+         $dst_img = $this->rotateImage($dst_img, $rotate);
+      }
 
-         if(!file_exists(dirname($image) ."/thumbs"))
-            mkdir(dirname($image) ."/thumbs");
+      /* write down new generated file */
+      $result = imagejpeg($dst_img, $thumb_image, 75);
 
-         $newfile = dirname($image) ."/thumbs/". $width ."_". basename($image);
-         imagejpeg($dst_img, $newfile, 75);
+      /* free your mind */
+      imagedestroy($dst_img);
+      imagedestroy($src_img);
 
-         /* free your mind */
-         imagedestroy($dst_img);
-         imagedestroy($src_img);
+      if($result === false) {
+         print "Can't write thumbnail ". $thumb_image ."\n";
+         return false;
       }
 
+      return true;
+
    } // create_thumbnail()
 
    public function get_meta_informations($file)
    {
-
       return exif_read_data($file);
 
    } // get_meta_informations()
@@ -360,51 +613,65 @@ class PHPFSPOT {
 
    } // check_config_table
 
-   public function gen_thumbs($idx = 0, $fromcmd = 0)
+   /**
+    * Generates a thumbnail from photo idx
+    *
+    * This function will generate JPEG thumbnails from provided F-Spot photo
+    * indizes.
+    *
+    * 1. Check if all thumbnail generations (width) are already in place and
+    *    readable
+    * 2. Check if the md5sum of the original file has changed
+    * 3. Generate the thumbnails if needed
+    */
+   public function gen_thumb($idx = 0, $fromcmd = 0, $force = 0)
    {
-      if(!$idx) {
-         /* get all available photos */
-         $all = $this->getAllTagPhotos();
-      }
-      else
-         $all = Array($idx);
-      
-      foreach($all as $photo) {
+      $resolutions = Array(
+         $this->cfg->thumb_width,
+         $this->cfg->bubble_width,
+         $this->cfg->photo_width,
+      );
 
-         $full_path = $this->translate_path($details['directory_path'])  ."/". $details['name'];
-         $file_md5 = md5_file($full_path);
+      $details = $this->get_photo_details($idx);
+      $full_path = $this->translate_path($details['directory_path'])  ."/". $details['name'];
+      $file_md5 = md5_file($full_path);
 
-         $details = $this->get_photo_details($photo);
-         if($fromcmd) print "Image ". $details['name'] ." Thumbnails:";
+      if($fromcmd) print "Image [". $idx ."] ". $details['name'] ." Thumbnails:";
 
-         /* if the file hasn't changed there is no need to regen the thumb */
-         if($file_md5 == $this->getMD5($photo)) {
-            if($fromcmd) print " file has not changed - skipping\n";
-            continue;
-         }
+      $error = 0;
+
+      foreach($resolutions as $resolution) {
 
-         /* set the new/changed MD5 sum for the current photo */
-         $this->setMD5($photo, $file_md5);
+         $thumb_path = $this->cfg->base_path ."/thumbs/". $resolution ."_". $file_md5;
 
-         $resolutions = Array(
-                           $this->cfg->thumb_width,
-                           $this->cfg->bubble_width,
-                           $this->cfg->photo_width
-                        );
+         /* if the thumbnail file doesn't exist, create it */
+         if(!file_exists($thumb_path)) {
 
-         /* create thumbnails for the requested resolutions */
-         foreach($resolutions as $resolution) {
             if($fromcmd) print " ". $resolution ."px";
-            $this->create_thumbnail($full_path, $resolution);
+            if(!$this->create_thumbnail($full_path, $thumb_path, $resolution))
+               $error = 1;
+
          }
 
-         if($fromcmd) print "\n";
+         /* if the file hasn't changed there is no need to regen the thumb */
+         elseif($file_md5 != $this->getMD5($idx) || $force) {
+
+            if($fromcmd) print " ". $resolution ."px";
+            if(!$this->create_thumbnail($full_path, $thumb_path, $resolution))
+               $error = 1;
 
+         }
       }
 
-   } // gen_thumbs()
+      /* set the new/changed MD5 sum for the current photo */
+      if(!$error)
+         $this->setMD5($idx, $file_md5);
+
+      if($fromcmd) print "\n";
+
+   } // gen_thumb()
 
-   private function getMD5($idx)
+   public function getMD5($idx)
    {
       $result = $this->cfg_db->db_query("
          SELECT img_md5 
@@ -429,6 +696,173 @@ class PHPFSPOT {
 
    } // setMD5()
 
+   public function setTagCondition($mode)
+   {
+      $_SESSION['tag_condition'] = $mode;
+
+   } // setTagCondition()
+
+   public function startTagSearch($searchfor)
+   {
+      $_SESSION['searchfor'] = $searchfor;
+      $_SESSION['selected_tags'] = Array();
+
+      foreach($this->avail_tags as $tag) {
+         if(preg_match('/'. $searchfor .'/i', $this->tags[$tag]))
+            array_push($_SESSION['selected_tags'], $tag);
+      }
+
+   } // startTagSearch()
+
+   private function rotateImage($img, $degrees)
+   {
+      if(function_exists("imagerotate"))
+         $img = imagerotate($img, $degrees, 0);
+      else
+      {
+         function imagerotate($src_img, $angle)
+         {
+            $src_x = imagesx($src_img);
+            $src_y = imagesy($src_img);
+            if ($angle == 180) {
+               $dest_x = $src_x;
+               $dest_y = $src_y;
+            }
+            elseif ($src_x <= $src_y) {
+               $dest_x = $src_y;
+               $dest_y = $src_x;
+            }
+            elseif ($src_x >= $src_y) {
+               $dest_x = $src_y;
+               $dest_y = $src_x;
+            }
+               
+            $rotate=imagecreatetruecolor($dest_x,$dest_y);
+            imagealphablending($rotate, false);
+               
+            switch ($angle) {
+            
+               case 90:
+                  for ($y = 0; $y < ($src_y); $y++) {
+                     for ($x = 0; $x < ($src_x); $x++) {
+                        $color = imagecolorat($src_img, $x, $y);
+                        imagesetpixel($rotate, $dest_x - $y - 1, $x, $color);
+                     }
+                  }
+                  break;
+
+               case 270:
+                  for ($y = 0; $y < ($src_y); $y++) {
+                     for ($x = 0; $x < ($src_x); $x++) {
+                        $color = imagecolorat($src_img, $x, $y);
+                        imagesetpixel($rotate, $y, $dest_y - $x - 1, $color);
+                     }
+                  }
+                  break;
+
+               case 180:
+                  for ($y = 0; $y < ($src_y); $y++) {
+                     for ($x = 0; $x < ($src_x); $x++) {
+                        $color = imagecolorat($src_img, $x, $y);
+                        imagesetpixel($rotate, $dest_x - $x - 1, $dest_y - $y - 1, $color);
+                     }
+                  }
+                  break;
+
+               default: $rotate = $src_img;
+            };
+
+            return $rotate;
+
+         }
+
+         $img = imagerotate($img, $degrees);
+
+      }
+
+      return $img;
+
+   } // rotateImage()
+
+   private function get_photo_tags($idx)
+   {
+      $result = $this->db->db_query("
+         SELECT t.id, t.name
+         FROM tags t
+         INNER JOIN photo_tags pt
+            ON t.id=pt.tag_id
+         WHERE pt.photo_id='". $idx ."'
+      ");
+
+      $tags = Array();
+
+      while($row = $this->db->db_fetch_object($result))
+         $tags[$row['id']] = $row['name'];
+
+      return $tags;
+
+   } // get_photo_tags()
+
+   public function showTextImage($txt, $color=000000, $space=4, $font=4, $w=300)
+   {
+      if (strlen($color) != 6) 
+         $color = 000000;
+
+      $int = hexdec($color);
+      $h = imagefontheight($font);
+      $fw = imagefontwidth($font);
+      $txt = explode("\n", wordwrap($txt, ($w / $fw), "\n"));
+      $lines = count($txt);
+      $im = imagecreate($w, (($h * $lines) + ($lines * $space)));
+      $bg = imagecolorallocate($im, 255, 255, 255);
+      $color = imagecolorallocate($im, 0xFF & ($int >> 0x10), 0xFF & ($int >> 0x8), 0xFF & $int);
+      $y = 0;
+
+      foreach ($txt as $text) {
+         $x = (($w - ($fw * strlen($text))) / 2);
+         imagestring($im, $font, $x, $y, $text, $color);
+         $y += ($h + $space);
+      }
+
+      Header("Content-type: image/png");
+      ImagePng($im);
+
+   } // showTextImage()
+
+   private function checkRequirements()
+   {
+      if(!function_exists("imagecreatefromjpeg")) {
+         print "PHP GD library extension is missing<br />\n";
+         $missing = true;
+      }
+
+      if(!function_exists("mysql_connect")) {
+         print "PHP MySQL library extension is missing<br />\n";
+         $missing = true;
+      }
+
+      if(!function_exists("sqlite3_open")) {
+         print "PHP SQLite3 library extension is missing<br />\n";
+         $missing = true;
+      }
+
+      /* Check for HTML_AJAX PEAR package, lent from Horde project */
+      ini_set('track_errors', 1);
+      @include 'HTML/AJAX/Server.php';
+      if(isset($php_errormsg)) {
+         print "PEAR HTML_AJAX package is missing<br />\n";
+         $missing = true;
+      }
+      ini_restore('track_errors');
+
+      if(isset($missing))
+         return false;
+
+      return true;
+
+   } // checkRequirements()
+         
+
 }
 
 ?>