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<?php 
/******************************************************************************************
   
   This Class can be used to resize the image in best possible aspect ratio .
   
   Copyright (c) 2011 Achint Verma <achintverma@luutaa.com>
   All Rights Reserved.

This library is free software; you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation; either version 2.1 of the License, or any
   later version.

This library 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 Lesser General Public
   License for more details.

You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
        
*******************************************************************************************

CLASS MODIFIED FOR PNG IMAGE FOR TRANSPARENCY & IT HAS FORCE FIT FUNCTION AS WELL

*******************************************************************************************/

class resizeImage{

function do_resize($w,$h,$filename=array(),$savepath, $forceSize = 0, $prefix = '', $quality = 100)
        {

//get the filename of the image
                $name = $filename['name'];
                
                // get the temporary filename of the image
                $tmpname=$filename['tmp_name'];
                
                //get the extension of the image
                $extension = strtolower(end(explode(".",$name)));
                
                // check wether supported files were uploaded or not
                if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif") && ($extension != "JPEG")) 
                {
                        echo ' Unsupported File Format';
                }
                else
                {
                        
                        
                        // set the name of the resized image which is "[current timestamp][-][defined width][defined height][extension]"
                        //$newf = $prefix."-".time()."-".str_replace(array(" ","_"),"-",$name);
                        $rand = rand(10000000000,99999999999);
                        $newf   = time().".".str_replace(array(" ","_"),".",$extension);
                        
                        
                        // check the format and apply php function 
                        if($extension=="jpg" || $extension=="jpeg" )
                        {
                                $im = imagecreatefromjpeg($tmpname);
                        }
                        else if($extension=="png")
                        {
                                $im = imagecreatefrompng($tmpname);
                        }
                        else if($extension=="gif")
                        {
                                $im = imagecreatefromgif($tmpname);
                        }
                        
                        // $W is original width of the image
                        // $H is original height of the image
                        // $w is given width of the image
                        // $h is given height of the image
                        
                        $W=imagesx($im); 
                        $H=imagesy($im); 
        
                        if($w==0)
                        {
                                $w = ($W/$H) *$h;       
                        }
                        else if($h==0)
                        {
                                $h = ($H/$W) * $w;                                                      
                        } 
                        
                        // variable declared for calculation of width and height of the image
                        $newH=0;
                        $newW=0;
                                                        
                        if($W>$w)
                        {
                                if($H>$h)
                                {
                                        if(($H/$h)>($W/$w))
                                        { 
                                                $newH=$h;
                                                $newW=$h*($W/$H);
                                        }
                                        else
                                        {
                                                $newW=$w;
                                                $newH=$w*($H/$W);
                                        }
                                }
                                else
                                {
                                        $newW=$w;
                                        $newH=$w*($H/$W);
                                }
                        } 
                        else
                        {
                                if($H>$h)
                                {
                                        $newH=$h;
                                        $newW=$h*($W/$H);
                                }
                                else
                                {
                                         $newH=$H;
                                         $newW=$W;
                                }
                        }
                        
                        // IF FORCESIZE FLAG IS SET. INGORE THE ASPECT RATIO 
                        if($forceSize==1)
                        {
                                $newW=$w;
                                $newH=$h;
                        }
                        
                        
                        // new temporary file is generated width new width and new height 
                        $new_temp_image  = imagecreatetruecolor($newW, $newH);
                                                
                        
                                        
                        
                                        
                        if($extension=="jpg" || $extension=="jpeg" )
                        {
                                imagecopyresampled($new_temp_image, $im, 0, 0, 0, 0, $newW, $newH, $W, $H);
                                
                                // imageinterlace is used for generating progressive image
                                imageinterlace($new_temp_image, true);
                                
                                // finally create a new resized image
                                imagejpeg($new_temp_image,$savepath.$newf,$quality);
                                
                        }
                        else if($extension=="png")
                        {
                                imagealphablending($new_temp_image, false);
                                imagesavealpha($new_temp_image,true);
                                $transparent = imagecolorallocatealpha($new_temp_image, 255, 255, 255, 127);
                                
                                imagefilledrectangle($new_temp_image, 0, 0, $newW, $newH, $transparent);
                                
                                imagecopyresampled($new_temp_image, $im, 0, 0, 0, 0, $newW, $newH, $W, $H);
                                
                                imagepng($new_temp_image,$savepath.$newf,9);

}
                        else if($extension == "gif" )
                        {
                                
                                imagecopyresampled($new_temp_image, $im, 0, 0, 0, 0, $newW, $newH, $W, $H);
                                
                                // set the transpatent color in the given image
                                $tranparent = imagecolortransparent($im);
   
                                  // check if we have a specific transparent color
                                  if ($tranparent >= 0) {
                           
                                                // get the original rgb value
                                                $transparent_color    = imagecolorsforindex($im, $tranparent);
                                   
                                                // Allocate the same color in the new image resource
                                                $tranparent    = imagecolorallocate($image_resized, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
                                   
                                                // fill the background of the new image with allocated color.
                                                imagefill($new_temp_image, 0, 0, $tranparent);
                                   
                                                // Set the background color for new image to transparent
                                                imagecolortransparent($new_temp_image, $tranparent);
                                   }
                                        
                                imagegif($new_temp_image,$savepath.$newf);
                        }
                                
                        imagedestroy($new_temp_image);
                                                
                        // after success this class returns the name of the new file
                        return $newf;
                }
        }
}
?>

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