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How would I apply this to a Link? So the Thumbnail becomes a link.

How would I apply this to a Link? So the Thumbnail becomes a link.
Use Html::link like that:
$html->link($image->resize($image_path, WIDTH, HEIGHT, SMALL_FOTO_ASPECT), $target_link, array(), false, false);
The last used parameter (false) says if function should escape title tags.

this helper is excellent. thanks!

Great job, few lines of code, and not using imagemagick :-) (imagemagick is very nice, but I think/guess/assume it's not available on most shared hosts)

One remark though: "ROOT.DS.APP_DIR.DS.WEBROOT_DIR.DS" is a bit a lengthy description for where WWW_ROOT would be more suited :-)
I changed the $fullpath initialization to this: "$fullpath = WWW_ROOT.$this->themeWeb.IMAGES_URL;"

Also, do you think it would be possible to use the app/tmp/cache for the thumbnails?

PS: Gentoo users, don't forget to enable the "gd" use-flag for dev-lang/php if you want this to work.

If we used app/tmp/cache for the thumbnails, would it be cleared on a regular basis? Or does the helper clear the cache (I couldn't find any code for it)?

Parse error: syntax error, unexpected ';', expecting T_FUNCTION in /...../helpers/image.php on line 72

70. return $this->output(sprintf($this->Html->tags['image'], $relfile, $this->Html->parseHtmlOptions($htmlAttributes, null, '', ' ')), $return);
71. }
72. ?>

there is a "}" missing at the end, you need to add it

Cake 1.2 users should replace $this->Html->parseHtmlOptions() with $this->Html->_parseAttributes() because it has been deleted in recent revisions of cake 1.2

When you try to resize image to its own size no image will be showed. This is because no image is copied to imagecache, but helper wants to show image from imagecache. Fiz that by adding after:

if ($resize) {
            $image = call_user_func('imagecreatefrom'.$types[$size[2]], $url);
            if (function_exists("imagecreatetruecolor") && ($temp = imagecreatetruecolor ($width, $height))) {
                imagecopyresampled ($temp, $image, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
              } else {
                $temp = imagecreate ($width, $height);
                imagecopyresized ($temp, $image, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
            }
            call_user_func("image".$types[$size[2]], $temp, $cachefile);
            imagedestroy ($image);
            imagedestroy ($temp);
        }
this:

elseif(!$cached){
            $relfile = $this->webroot.$this->themeWeb.IMAGES_URL.$path;
    }

This will cause helper show real image.

Hi,
I am getting this following error.
Fatal error: Call to a member function resize() on a non-object in

Great helper!!

There is one problem. When I upload a big file and I try to display it using the helper I get the following error:

"Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 10444 bytes) in /usr/local/psa/home/vhosts/sportschoolgekoning.nl/httpdocs/app/views/helpers/image.php on line 58"

Is there a solution to this problem?

Thanks

Been using this helper a lot and after a while I found a couple of bugs which I solve in this delivery:

• adds alt="thumb" by default if no alt prop. sent. to make it html4/css2 copmpilant
• The was a bug when the image being resized is allready of the desired dimentions. It simply didn't render the image. I just added 1 line to solve this.

In the version I use I also added the functionality to render a generic image if the file isn't found but removed it in this bug report because you probably want to implement that yoursefl.


<?php
/**
 * @version 1.1
 * @author Josh Hundley
 * @author Jorge Orpinel <jop@levogiro.net> (changes)
 */
class ImageHelper extends Helper
{
  var $helpers = array('Html');
  var $cacheDir = 'imagecache'; // relative to 'img'.DS

  /**
   * Automatically resizes an image and returns formatted IMG tag
   *
   * @param string $path Path to the image file, relative to the webroot/img/ directory.
   * @param integer $width Image of returned image
   * @param integer $height Height of returned image
   * @param boolean $aspect Maintain aspect ratio (default: true)
   * @param array    $htmlAttributes Array of HTML attributes.
   * @param boolean $return Wheter this method should return a value or output it. This overrides AUTO_OUTPUT.
   * @return mixed    Either string or echos the value, depends on AUTO_OUTPUT and $return.
   * @access public
   */
  function resize($path, $width, $height, $aspect = true, $htmlAttributes = array(), $return = false) {
    $types = array(1 => "gif", "jpeg", "png", "swf", "psd", "wbmp"); // used to determine image type
    if(empty($htmlAttributes['alt'])) $htmlAttributes['alt'] = 'thumb';  // Ponemos alt default
    
    $fullpath = ROOT.DS.APP_DIR.DS.WEBROOT_DIR.DS.$this->themeWeb.'img'.DS;
    $url = $fullpath.$path;
    
    if (!($size = getimagesize($url))) 
      return; // image doesn't exist 
    
    if ($aspect) { // adjust to aspect.
      if (($size[1]/$height) > ($size[0]/$width))  // $size[0]:width, [1]:height, [2]:type
      $width = ceil(($size[0]/$size[1]) * $height);
      else
      $height = ceil($width / ($size[0]/$size[1]));
    }

    $relfile = $this->webroot.$this->themeWeb.'img'.'/'.$this->cacheDir.'/'.$width.'x'.$height.'_'.basename($path); // relative file
    $cachefile = $fullpath.$this->cacheDir.DS.$width.'x'.$height.'_'.basename($path);  // location on server

    if (file_exists($cachefile)) {
      $csize = getimagesize($cachefile);
      $cached = ($csize[0] == $width && $csize[1] == $height); // image is cached
      if (@filemtime($cachefile) < @filemtime($url)) // check if up to date
      $cached = false;
    } else {
      $cached = false;
    }

    if (!$cached) {
      $resize = ($size[0] > $width || $size[1] > $height) || ($size[0] < $width || $size[1] < $height);
    } else {
      $resize = false;
    }

    if ($resize) {
      $image = call_user_func('imagecreatefrom'.$types[$size[2]], $url);
      if (function_exists("imagecreatetruecolor") && ($temp = imagecreatetruecolor ($width, $height))) {
        imagecopyresampled ($temp, $image, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
      } else {
        $temp = imagecreate ($width, $height);
        imagecopyresized ($temp, $image, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
      }
      call_user_func("image".$types[$size[2]], $temp, $cachefile);
      imagedestroy ($image);
      imagedestroy ($temp);
    } else {
      copy($url, $cachefile);
    }

    return $this->output(sprintf($this->Html->tags['image'], $relfile, $this->Html->_parseAttributes($htmlAttributes, null, '', ' ')), $return);
  }
}
?>


Actually you MUST replace my

 ...
    } else {
      copy($url, $cachefile);
... 

lines for:

 ...
    } elseif (!$cached) {
      copy($url, $cachefile);
... 

Otherwise it will become really buggy! Sorry for that.

For CakePHP v1.2 users: the Josh Hundley's version uses Html->parseHtmlOptions() that is not present in Cake v1.2 and must be changed to Html->_parseAttributes().

With Jorge Orpinel's version, which uses Html->_parseAttributes and therefore works nice with 1.2, you may have some warnings when the source image cannot be find. Just change


<?php
if (!($size = getimagesize($url))) 
      return; // image doesn't exist 
?>


to


<?php
if (!file_exists($url) || is_dir($url)  || !($size = getimagesize($url))) 
      return; // image doesn't exist 
?>



For those who don't like using "imagecache", just change $cacheDir value: I think it may be clearer if you customize the default image cache directory using


<?php
Configure::write('Image.imagecache', 'another_directory');
?>


in config/core.php

and add these few lines to the helper:


<?php
var $cacheDir; // relative to 'img'.DS; Default to "imagecache". Defined in /config/core.php with Configure::write('Image.imagecache', 'imagecache');

 function __construct()
 {
     $this->cacheDir = (Configure::read('Image.imagecache')?Configure::read('Image.imagecache'):'imagecache');
 }
?>



This is the resulting helper:



<?php
/**
 * @version 1.1
 * @author Josh Hundley
 * @author Jorge Orpinel <jop@levogiro.net> (changes)
 * @author Arialdo Martini <arialdomartini@bebox.it> (changes)
 */
class ImageHelper extends Helper
{
  var $helpers = array('Html');
  //var $cacheDir = 'thumbs'; // relative to 'img'.DS
  var $cacheDir; // relative to 'img'.DS; Default to "imagecache". Defined in /config/core.php with Configure::write('Image.imagecache', 'imagecache');

 function __construct()
 {
     $this->cacheDir = (Configure::read('Image.imagecache')?Configure::read('Image.imagecache'):'imagecache');
 }
  /**
   * Automatically resizes an image and returns formatted IMG tag
   *
   * @param string $path Path to the image file, relative to the webroot/img/ directory.
   * @param integer $width Image of returned image
   * @param integer $height Height of returned image
   * @param boolean $aspect Maintain aspect ratio (default: true)
   * @param array    $htmlAttributes Array of HTML attributes.
   * @param boolean $return Wheter this method should return a value or output it. This overrides AUTO_OUTPUT.
   * @return mixed    Either string or echos the value, depends on AUTO_OUTPUT and $return.
   * @access public
   */
  function resize($path, $width, $height, $aspect = true, $htmlAttributes = array(), $return = false) {
    $types = array(1 => "gif", "jpeg", "png", "swf", "psd", "wbmp"); // used to determine image type
    if(empty($htmlAttributes['alt'])) $htmlAttributes['alt'] = 'thumb';  // Ponemos alt default
    
    $fullpath = ROOT.DS.APP_DIR.DS.WEBROOT_DIR.DS.$this->themeWeb.'img'.DS;
    $url = $fullpath.$path;
    
    if (!file_exists($url) || is_dir($url)  || !($size = getimagesize($url))) 
      return; // image doesn't exist 
    
    if ($aspect) { // adjust to aspect.
      if (($size[1]/$height) > ($size[0]/$width))  // $size[0]:width, [1]:height, [2]:type
      $width = ceil(($size[0]/$size[1]) * $height);
      else
      $height = ceil($width / ($size[0]/$size[1]));
    }

    $relfile = $this->webroot.$this->themeWeb.'img'.'/'.$this->cacheDir.'/'.$width.'x'.$height.'_'.basename($path); // relative file
    $cachefile = $fullpath.$this->cacheDir.DS.$width.'x'.$height.'_'.basename($path);  // location on server

    if (file_exists($cachefile)) {
      $csize = getimagesize($cachefile);
      $cached = ($csize[0] == $width && $csize[1] == $height); // image is cached
      if (@filemtime($cachefile) < @filemtime($url)) // check if up to date
      $cached = false;
    } else {
      $cached = false;
    }

    if (!$cached) {
      $resize = ($size[0] > $width || $size[1] > $height) || ($size[0] < $width || $size[1] < $height);
    } else {
      $resize = false;
    }

    if ($resize) {
      $image = call_user_func('imagecreatefrom'.$types[$size[2]], $url);
      if (function_exists("imagecreatetruecolor") && ($temp = imagecreatetruecolor ($width, $height))) {
        imagecopyresampled ($temp, $image, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
      } else {
        $temp = imagecreate ($width, $height);
        imagecopyresized ($temp, $image, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
      }
      call_user_func("image".$types[$size[2]], $temp, $cachefile);
      imagedestroy ($image);
      imagedestroy ($temp);
      } elseif (!$cached) {
      copy($url, $cachefile);
    }

    return $this->output(sprintf($this->Html->tags['image'], $relfile, $this->Html->_parseAttributes($htmlAttributes, null, '', ' ')), $return);
  }
}
?> 


when i use this helper it works great !
now i need to use it in a controller.
i tried to follow this :
http://www.m3nt0r.de/blog/2007/08/12/cakephp-helpercomponent/
but it gives me some erreors :

Notice: Undefined property: ImageHelper::$themeWeb in /mydir/views/helpers/image.php on line 30

Notice: Undefined property: ImageHelper::$webroot in /mydir/views/helpers/image.php on line 43

any idea on how to correct that?

Excellent helper!
If you have two files with the same name but in different directories (eg. img/some_dir/flower.jpg and img/some_other_dir/flower.jpg), it will be treated as same file by the helper (if you attempt to resize it to the same size).
I modified the code, so that the created filename is constructed of path and filename (and not only filename).
Example: a picture in 'img/some_dir/flower.jpg' will be named '200x100_img_some_dir-flower.jpg' in the cache (if resized to 200x100).

Replace the following:

$relfile = $this->webroot.$this->themeWeb.IMAGES_URL.$this->cacheDir.'/'.$width.'x'.$height.'_'.basename($path); // relative file
$cachefile = $fullpath.$this->cacheDir.DS.$width.'x'.$height.'_'.basename($path); 


with:

$dir_path = preg_replace("/[^a-z0-9_]/", "_", strtolower(dirname($path)));  // make dirname suitable as a filename
$dir_path .= '-'.basename($path); // append basename
        
$relfile = $this->webroot.$this->themeWeb.IMAGES_URL.$this->cacheDir.'/'.$width.'x'.$height.'_'.$dir_path; // relative file
$cachefile = $fullpath.$this->cacheDir.DS.$width.'x'.$height.'_'.$dir_path;  // location on server