<?php
class Img_utils{
# public var (class default values)
var $config = array(
'max_width' => 80,
'max_height' => 80,
'scale_by' => 'auto', // posible values: width, height, auto
);
#private source image var...
var $img_source = '';
var $img_handler = false;
var $img_width = null;
var $img_height = null;
#private thumbs var...
var $thumb_handler = false;
var $thumb_width = null;
var $thumb_height = null;
var $thumb_x = 0;
var $thumb_y = 0;
/**
* Open a source image file and calculate thumbmail size
*
* @param string $file
* @return boolean
*/
function open($file){
//intitialize private var...
$this->img_source = $file;
$this->img_handler = false;
$this->thumb_handler = false;
$this->thumb_width = null;
$this->thumb_height = null;
$this->thumb_x = 0;
$this->thumb_y = 0;
//initialize img_handler
$arr_pathinfo = pathinfo($file);
$extension = strtolower($arr_pathinfo['extension']);
if($extension == 'jpg' || $extension == 'jpeg')
$this->img_handler = imagecreatefromjpeg($file);
elseif($extension == 'png')
$this->img_handler = imagecreatefrompng($file);
elseif($extension == 'gif')
$this->img_handler = imagecreatefromgif($file);
elseif($extension == 'bmp')
$this->img_handler = imagecreatefromwbmp($file);
if($this->img_handler){
//image original size
list($this->img_width, $this->img_height) = getimagesize($this->img_source);
return true;
}
return false;
}
/**
* Save the thumbmail or image
*
* @param string $file
* @param string $ext
* @return booblean
*/
function save($file, $ext = 'png'){
ini_set ( "memory_limit", "48M");
if(is_null($this->thumb_width) or is_null($this->thumb_height)){
$this->thumb_width = $this->img_width;
$this->thumb_height = $this->img_height;
}
$this->thumb_handler = imagecreatetruecolor($this->thumb_width, $this->thumb_height);
@imagecopyresampled($this->thumb_handler, $this->img_handler, 0 , 0, $this->thumb_x, $this->thumb_y, $this->thumb_width, $this->thumb_height, $this->img_width, $this->img_height);
@unlink($file);
switch ($ext) {
case 'bmp':
imagewbmp ($this->thumb_handler, "$file.bmp");
break;
case 'gif':
imagegif ($this->thumb_handler, "$file.gif");
break;
case 'jpg':
case 'jpeg':
imagejpeg ($this->thumb_handler, "$file.jpg", 80);
break;
case 'png':
default:
imagepng ($this->thumb_handler, "$file.png", 8);
break;
}
return imagedestroy($this->thumb_handler);
}
/**
* Create a thumbmail with a portion (subarea) of the source image
*
* @param string $file
* @param int $x thumb x position
* @param int $y thumb y position
* @param int $w thumb width
* @param int $h thumb height
*/
function crop($x, $y, $w, $h){
$this->thumb_x = intval($x);
$this->thumb_y = intval($y);
$this->img_width = intval($w);
$this->img_height = intval($h);
}
/**
* Create thumbmail...
*
* @param int $max_width
* @param int $max_height
* @param string $scale_by
*/
function resize($max_width, $max_height, $scale_by = 'auto'){
$this->config['max_width'] = intval($max_width);
$this->config['max_height'] = intval($max_height);
$this->config['scale_by'] = ($scale_by == 'height')? 'height' : ($scale_by == 'width')? 'width' : 'auto';
$this->auto_resize();
}
/**
* Auto resize the thumb using the default 'scale_by' value of class constructor...
*
*/
function auto_resize(){
switch ($this->config['scale_by']) {
case 'width':
$this->resize_by_width($this->config['max_width']);
break;
case 'height':
$this->resize_by_height($this->config['max_height']);
break;
case 'auto':
default:
//is it landscape or portrait image?
if($this->img_width > $this->img_height){
//it is landscape, resize by with
$this->resize_by_width($this->config['max_width']);
if($this->thumb_height > $this->config['max_height'])
$this->resize_by_height($this->config['max_height']);
}elseif($this->img_width < $this->img_height){
//it is portrait, resize by height
$this->resize_by_height($this->config['max_height']);
if($this->thumb_width > $this->config['max_width'])
$this->resize_by_width($this->config['max_width']);
}else{
//is a square
$this->thumb_width = $this->config['max_width'];
$this->thumb_height = $this->config['max_height'];
}
break;
}
}
/**
* Rezise thumb by height
*
* @param int $height
*/
function resize_by_height($height){
$this->thumb_height = $height;
$ratio = $height / $this->img_width;
$this->thumb_width = intval($this->img_height * $ratio);
}
/**
* Rezise thumb by width
*
* @param int $width
*/
function resize_by_width($width){
$this->thumb_width = $width;
$ratio = $width / $this->img_width;
$this->thumb_height = intval($this->img_height * $ratio);
}
}
?>
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