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<?php
/**
* @package SPLIB
* @version $Id: Thumbnail.php,v 1.1 2003/12/12 08:06:06 kevin Exp $
*/
/**
* Thumbnail<br />
* Resizes images to thumbnails
* @package SPLIB
* @access public
* @todo bug fix for multiple images
* @todo PHP < 4.3.0 compatibility
*/
class Thumbnail {
/**
* Maximum width of the thumbnail in pixels
* @access private
* @var int
*/
var $maxWidth;
/**
* Maximum height of the thumbnail in pixels
* @access private
* @var int
*/
var $maxHeight;
/**
* Whether to scale image to fit thumbnail (true) or
* strech to fit (false)
* @access private
* @var boolean
*/
var $scale;
/**
* Whether to inflate images smaller the the thumbnail
* @access private
* @var boolean
*/
var $inflate;
/**
* List of accepted image types based on MIME description
* @access private
* @var array
*/
var $types;
/**
* Stores function names for each image type e.g. imagecreatefromjpeg
* @access private
* @var array
*/
var $imgLoaders;
/**
* Stores function names for each image type e.g. imagejpeg
* @access private
* @var array
*/
var $imgCreators;
/**
* The source image
* @access private
* @var resource
*/
var $source;
/**
* Width of source image in pixels
* @access private
* @var int
*/
var $sourceWidth;
/**
* Height of source image in pixels
* @access private
* @var int
*/
var $sourceHeight;
/**
* MIME type of source image
* @access private
* @var string
*/
var $sourceMime;
/**
* The thumbnail
* @access private
* @var resource
*/
var $thumb;
/**
* Width of thumbnail in pixels
* @access private
* @var int
*/
var $thumbWidth;
/**
* Height of thumbnail in pixels
* @access private
* @var int
*/
var $thumbHeight;
/**
* Thumbnail constructor
* @param int max width of thumbnail
* @param int max height of thumbnail
* @param boolean (optional) if true image scales
* @param boolean (optional) if true inflate small images
* @access public
*/
function Thumbnail ($maxWidth,$maxHeight,$scale=true,$inflate=true) {
$this->maxWidth=$maxWidth;
$this->maxHeight=$maxHeight;
$this->scale=$scale;
$this->inflate=$inflate;
// Consider modifying these to add to handle other images
$this->types=array('image/jpeg','image/png');
$this->imgLoaders=array(
'image/jpeg'=>'imagecreatefromjpeg',
'image/png'=>'imagecreatefrompng'
);
$this->imgCreators=array(
'image/jpeg'=>'imagejpeg',
'image/png'=>'imagepng'
);
}
/**
* Loads an image from a file
* @param string filename (with path) of image
* @return boolean
* @access public
*/
function loadFile ($image) {
if ( !$dims=@GetImageSize($image) ) {
trigger_error('Could not find image '.$image);
return false;
}
if ( in_array($dims['mime'],$this->types) ) {
$loader=$this->imgLoaders[$dims['mime']];
$this->source=$loader($image);
$this->sourceWidth=$dims[0];
$this->sourceHeight=$dims[1];
$this->sourceMime=$dims['mime'];
$this->initThumb();
return true;
} else {
trigger_error('Image MIME type '.$dims['mime'].' not supported');
return false;
}
}
/**
* Loads an image from a string (e.g. database)
* @param string the image
* @param mime mime type of the image
* @return boolean
* @access public
*/
function loadData ($image,$mime) {
if ( in_array($mime,$this->types) ) {
$this->source=imagecreatefromstring($image);
$this->sourceWidth=imagesx($this->source);
$this->sourceHeight=imagesy($this->source);
$this->sourceMime=$mime;
$this->initThumb();
return true;
} else {
trigger_error('Image MIME type '.$mime.' not supported');
return false;
}
}
/**
* If a filename is provides, creates the thumbnail using that name
* If not, the image is output to the browser
* @param string (optional) filename to create image with
* @return boolean
* @access public
*/
function buildThumb ($file=null) {
$creator=$this->imgCreators[$this->sourceMime];
if ( isset ( $file ) ) {
return $creator($this->thumb,$file);
} else {
return $creator($this->thumb);
}
}
/**
* Returns the mime type for the thumbnail
* @return string
* @access public
*/
function getMime () {
return $this->sourceMime;
}
/**
* Returns the width of the thumbnail
* @return int
* @access public
*/
function getThumbWidth() {
return $this->thumbWidth;
}
/**
* Returns the height of the thumbnail
* @return int
* @access public
*/
function getThumbHeight() {
return $this->thumbHeight;
}
/**
* Creates the thumbnail
* @return void
* @access private
*/
function initThumb () {
if ( $this->scale ) {
if ( $this->sourceWidth > $this->sourceHeight ) {
$this->thumbWidth=$this->maxWidth;
$this->thumbHeight=floor(
$this->sourceHeight*($this->maxWidth/$this->sourceWidth)
);
} else if ( $this->sourceWidth < $this->sourceHeight ) {
$this->thumbHeight=$this->maxHeight;
$this->thumbWidth=floor(
$this->sourceWidth*($this->maxHeight/$this->sourceHeight)
);
} else {
$this->thumbWidth=$this->maxWidth;
$this->thumbHeight=$this->maxHeight;
}
} else {
$this->thumbWidth=$this->maxWidth;
$this->thumbHeight=$this->maxHeight;
}
$this->thumb=imagecreatetruecolor($this->thumbWidth,
$this->thumbHeight);
if ( $this->sourceWidth <= $this->maxWidth &&
$this->sourceHeight <= $this->maxHeight &&
$this->inflate == false ) {
$this->thumb=& $this->source;
} else {
imagecopyresampled( $this->thumb, $this->source, 0, 0, 0, 0,
$this->thumbWidth, $this->thumbHeight,
$this->sourceWidth, $this->sourceHeight );
}
}
}
?>
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