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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;
}
}
}
?>