Image resize function

[GatoX]

Hi, I have trying to upload many photos, but there were bigger than permited, and is a bit boring upload to online services how imageshack, which delete it with the time.

I would like to contribute in the forums and I make a php script (I'm learning) for auto-resize the pictures to a correct width and height. This script scale it to a smaller format keeping the aspect ratio, and here how works:

First- I have a picture with any size:

Second- I put it in the function adjust() adding the filename between brackets:

Third- I execute the php code from cmd console (can be executed in browser):

Fourth- Ta daa, resized to correct width and height:

All these images has been converted with this script

Pd: It would be a honor introduce it in laserpointerforums image uploader. If it isn't possible I could make a javascript simple client aplication for users.

The code is divided in the library:

<?php
 
/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/
 
class SimpleImage {
 
   var $image;
   var $image_type;
 
   function load($filename) {
 
      $image_info = getimagesize($filename);
      $this->image_type = $image_info[2];
      if( $this->image_type == IMAGETYPE_JPEG ) {
 
         $this->image = imagecreatefromjpeg($filename);
      } elseif( $this->image_type == IMAGETYPE_GIF ) {
 
         $this->image = imagecreatefromgif($filename);
      } elseif( $this->image_type == IMAGETYPE_PNG ) {
 
         $this->image = imagecreatefrompng($filename);
      }
   }
   function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
 
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image,$filename,$compression);
      } elseif( $image_type == IMAGETYPE_GIF ) {
 
         imagegif($this->image,$filename);
      } elseif( $image_type == IMAGETYPE_PNG ) {
 
         imagepng($this->image,$filename);
      }
      if( $permissions != null) {
 
         chmod($filename,$permissions);
      }
   }
   function output($image_type=IMAGETYPE_JPEG) {
 
      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image);
      } elseif( $image_type == IMAGETYPE_GIF ) {
 
         imagegif($this->image);
      } elseif( $image_type == IMAGETYPE_PNG ) {
 
         imagepng($this->image);
      }
   }
   function getWidth() {
 
      return imagesx($this->image);
   }
   function getHeight() {
 
      return imagesy($this->image);
   }
   function resizeToHeight($height) {
 
      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
   }
 
   function resizeToWidth($width) {
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;
      $this->resize($width,$height);
   }
 
   function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }
 
   function resize($width,$height) {
      $new_image = imagecreatetruecolor($width, $height);
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
   }
    
}
?>

(This library isn't mine)

and the function:

<?php
require_once 'library.php';
function adjust($filename) {
	
	$image = new SimpleImage();
	$image->load("$filename");
	$getWidth = $image->getWidth("$filename");
	$getHeight = $image->getHeight("$filename");
	
	if($getWidth > 800 || $getHeight > 600){
		if($getWidth/$getHeight < 4/3){
	
			$height = 600;
			$width = 600 * ($getWidth/$getHeight);
	
		} else {

			$width = 800;
			$height = 800 / ($getWidth/$getHeight);
	
		}
	} else {
		
		$width = $getWidth;
		$height = $getHeight;
		
	}
	
$image->resize("$width","$height");
$image->save("$filename");
	   
}

adjust("test.jpg"); //Input here the filename

?>