ImageHelper | |
| Type: Class |
Category: File Management |
| License: GNU General Public License |
Language: PHP |
| Description: An update of http://bakery.cakephp.org/articles/view/image-resize-helper to provide extra flexibilty for multiple cache directories to avoid overwriting existing files. | |
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Latest Snippet Version: :1.6
<?php
/*
Version: 1.6
*/
class ImageHelper extends Helper {
var $helpers = array('Html');
// name to use for cache directories
var $nameOfCache = 'cache';
var $cacheDir = null;
/**
* 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
* usage: <?php $image->resize('blog_photos/blog_photo_1.jpg', 25, 25, true); ?>
*/
function resize($path='', $width, $height, $aspect = true, $htmlAttributes = array(), $return = false)
{
// Cake Folder class
uses('folder');
$types = array(1 => "gif", "jpeg", "png", "swf", "psd", "wbmp"); // used to determine image type
$fullpath = WWW_ROOT.$this->themeWeb.IMAGES_URL;
// break file path into array
$paths = explode('/', $path);
// get directory that image sits in
if (count($paths) > 1)
{
$imgDir = $paths[count($paths)-2];
// location of cache
$this->cacheDir = $imgDir.DS.$this->nameOfCache;
}
// check if cache directory exists, if not create it
new Folder($fullpath.$this->cacheDir, true, 0777);
// full URL to image
$url = $fullpath.$path;
// check image exists and get size info
if (!($size = getimagesize($url)))
return; // image doesn't exist
// adjust to aspect.
if ($aspect)
{
if (($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.IMAGES_URL.$this->cacheDir.'/'.$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);
}
return $this->output(sprintf($this->Html->tags['image'], $relfile, $this->Html->_parseAttributes($htmlAttributes, null, '', ' ')), $return);
}
}
?>
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