/public/shop/core/lib/image.php

<?php
/*------------------------------------------------------------------------------
  $Id$

  Shopping Cart
  http://dev.club4causes.com/shop

  Club4Causes v1.0

  This source file is subject to Open Software License (OSL 3.0)
  License details is bundled with this package in the file LICENSE.txt.
  It is also available at this URL:
  <http://www.opensource.org/licenses/OSL-3.0>

 UPGRADE NOTE:
   Do not edit or add to this file if you wish to upgrade Shopping Cart to newer
   versions in the future. If you wish to customize Shopping Cart for your
   needs please refer to http://dev.club4causes.com/shop for more information.
------------------------------------------------------------------------------*/
if (! defined ( 'DIR_CORE' )) {
	header ( 'Location: static_pages/' );
}

final class AImage {
    private $file;
    private $image;
    private $info;
		
	public function __construct($file) {
		if (file_exists($file)) {
			$this->file = $file;

			$info = getimagesize($file);
			if(!$info){
				$this->file = null;
				return false;
			}
			$this->info = array(
            	'width'  => $info[0],
            	'height' => $info[1],
            	'bits'   => $info['bits'],
            	'mime'   => $info['mime']
        	);
        	
        	$this->image = $this->create($file);
    	} else {
            throw new AException(AC_ERR_LOAD, 'Error: Could not load image ' . $file . '!');
    	}
	}

	private function create($image) {
		$mime = $this->info['mime'];
		
		if ($mime == 'image/gif') {
			return imagecreatefromgif($image);
		} elseif ($mime == 'image/png') {
			return imagecreatefrompng($image);
		} elseif ($mime == 'image/jpeg') {
			return imagecreatefromjpeg($image);
		}
    }	
	
    public function save($file, $quality = 100) {
		$extension = pathinfo($file,PATHINFO_EXTENSION);
        if ($extension == 'jpeg' || $extension == 'jpg') {
            imagejpeg($this->image, $file, $quality);
        } elseif($extension == 'png') {
            imagepng($this->image, $file, 0);
        } elseif($extension == 'gif') {
            imagegif($this->image, $file);
        }
        chmod($file, 0777);
	    imagedestroy($this->image);
    }	    
	
    public function resize($width = 0, $height = 0, $nofill=false) {
    	if (!$this->info['width'] || !$this->info['height']) {
			return;
		}
        if ($width == 0 && $height == 0) {
			return;
		}

		$scale = min($width / $this->info['width'], $height / $this->info['height']);
		
		if ($scale == 1 && $this->info['mime'] != 'image/png') {
			return;
		}
		
		$new_width = (int)round($this->info['width'] * $scale,0);
		$new_height = (int)round($this->info['height'] * $scale,0);
    	$xpos = (int)(($width - $new_width) / 2);
   		$ypos = (int)(($height - $new_height) / 2);
        		        
       	$image_old = $this->image;

        $this->image = imagecreatetruecolor($width, $height);

		if (isset($this->info['mime']) && $this->info['mime'] == 'image/png') {
			imagealphablending($this->image, false);
			imagesavealpha($this->image, true);
			$background = imagecolorallocatealpha($this->image, 255, 255, 255, 127);
			imagefill($this->image, 0,0,$background);
		} else {
			if(!$nofill){ // if image no transparant
				$background = imagecolorallocate($this->image, 255, 255, 255);
				imagefilledrectangle($this->image, 0, 0, $width, $height, $background);
			}
		}

		if(is_resource($this->image)){
            imagecopyresampled($this->image, $image_old, $xpos, $ypos, 0, 0, $new_width, $new_height, $this->info['width'], $this->info['height']);
		}
	    if(is_resource($image_old)){
            imagedestroy($image_old);
	    }
           
        $this->info['width']  = $width;
        $this->info['height'] = $height;
	    return true;
    }
    
    public function watermark($file, $position = 'bottomright') {
        $watermark = $this->create($file);
        
        $watermark_width = imagesx($watermark);
        $watermark_height = imagesy($watermark);
        
        switch($position) {
            case 'topleft':
                $watermark_pos_x = 0;
                $watermark_pos_y = 0;
                break;
            case 'topright':
                $watermark_pos_x = $this->info['width'] - $watermark_width;
                $watermark_pos_y = 0;
                break;
            case 'bottomleft':
                $watermark_pos_x = 0;
                $watermark_pos_y = $this->info['height'] - $watermark_height;
                break;
            case 'bottomright':
                $watermark_pos_x = $this->info['width'] - $watermark_width;
                $watermark_pos_y = $this->info['height'] - $watermark_height;
                break;
        }
        imagecopy($this->image, $watermark, $watermark_pos_x, $watermark_pos_y, 0, 0, 120, 40);
        imagedestroy($watermark);
    }
    
    public function crop($top_x, $top_y, $bottom_x, $bottom_y) {
        $image_old = $this->image;
        $this->image = imagecreatetruecolor($bottom_x - $top_x, $bottom_y - $top_y);
        
        imagecopy($this->image, $image_old, 0, 0, $top_x, $top_y, $this->info['width'], $this->info['height']);
        imagedestroy($image_old);
        
        $this->info['width'] = $bottom_x - $top_x;
        $this->info['height'] = $bottom_y - $top_y;
    }
    
    public function rotate($degree, $color = 'FFFFFF') {
		$rgb = $this->html2rgb($color);
		
        $this->image = imagerotate($this->image, $degree, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));
        
		$this->info['width'] = imagesx($this->image);
		$this->info['height'] = imagesy($this->image);
    }
	    
    private function filter($filter) {
        imagefilter($this->image, $filter);
    }
            
    private function text($text, $x = 0, $y = 0, $size = 5, $color = '000000') {
		$rgb = $this->html2rgb($color);
        
		imagestring($this->image, $size, $x, $y, $text, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));
    }
    
    private function merge($file, $x = 0, $y = 0, $opacity = 100) {
        $merge = $this->create($file);

        $merge_width = imagesx($merge);
        $merge_height = imagesy($merge);
		        
        imagecopymerge($this->image, $merge, $x, $y, 0, 0, $merge_width, $merge_height, $opacity);
    }
			
	private function html2rgb($color) {
		if ($color[0] == '#') {
			$color = substr($color, 1);
		}
		
		if (strlen($color) == 6) {
			list($r, $g, $b) = array($color[0] . $color[1], $color[2] . $color[3], $color[4] . $color[5]);   
		} elseif (strlen($color) == 3) {
			list($r, $g, $b) = array($color[0] . $color[0], $color[1] . $color[1], $color[2] . $color[2]);    
		} else {
			return FALSE;
		}
		
		$r = hexdec($r); 
		$g = hexdec($g); 
		$b = hexdec($b);    
		
		return array($r, $g, $b);
	}


	public function __destruct() {
		if (is_resource($this->image)){
			imagedestroy($this->image);
		}else{
			$this->image = null;
		}
	}

}
?>