[SOLVED] Center watermark?

[slpctrl]

<?php
header("Content-type: image/jpeg");
function resizeimg($image)
{
   $image = $_GET['image'];
   $w = 320;
   $h = 240;

   $x = @getimagesize($image);
   $sw = $x[0];
   $sh = $x[1];

   $new = @ImageCreateFromJPEG($image) or $new = @ImageCreateFromPNG($image) or $new =
      @ImageCreateFromGIF($image) or $new = false;

   if(!$new)
   {
      readfile($new);
   }
   else
   {
      $thumb = @ImageCreateTrueColor($w, $h);
      @ImageCopyResampled($thumb, $new, 0, 0, 0, 0, $w, $h, $sw, $sh);
      return $thumb;
   }
   return false;
}
$image = resizeimg($_GET['image']);
$watermark = imagecreatefrompng('watermark.png');
$watermark_width = imagesx($watermark);
$watermark_height = imagesy($watermark);
$dest_x = imagesx($image) - $watermark_width - 5;
$dest_y = imagesy($image) - $watermark_height - 5;
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height,
   100);
imagejpeg($image);
imagedestroy($image);
imagedestroy($watermark);
?> 

 

The lines:

$dest_x = imagesx($image) - $watermark_width - 5;

$dest_y = imagesy($image) - $watermark_height - 5;

 

Is what I got to put the watermark in the corner, but when I try to calculate half the size of the thumbnail I create in the resize function (340x240) I can't seem to put the watermark in the center  . Any suggestions?

[slpctrl]

Meh, I got it after a lot of trial and error. Here's the final working code, it resizes an image to 320x240 and places a watermark in the center. You just gotta put watermark.png in the same directory to get it workin:

 

<?php
header("Content-type: image/jpeg");
function resizeimg($image)
{
   $image = $_GET['image'];
   $w = 320;
   $h = 240;
   $x = @getimagesize($image);
   $sw = $x[0];
   $sh = $x[1];
   $new = @ImageCreateFromJPEG($image) or
   $new = @ImageCreateFromPNG($image) or
   $new = @ImageCreateFromGIF($image) or
   $new = false;
   if(!$new)
   {
      readfile($new);
   }
   else
   {
      $thumb = @ImageCreateTrueColor($w, $h);
      @ImageCopyResampled($thumb, $new, 0, 0, 0, 0, $w, $h, $sw, $sh);
      return $thumb;
   }
   return false;
}
$image = resizeimg($_GET['image']);
$watermark = imagecreatefrompng('watermark.png');
$watermark_width = imagesx($watermark);
$watermark_height = imagesy($watermark);
$dest_x = (imagesx($image) - $watermark_width)/2;
$dest_y = (imagesy($image) - $watermark_height)/2;
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 30);
imagejpeg($image);
imagedestroy($image);
imagedestroy($watermark);
?>

 

Alternatively, if you wish to specify the width and height of the resize you can set them to GET variables:

 

<?php
header("Content-type: image/jpeg");
function resizeimg($image)
{
   $image = $_GET['image'];
   $w = $_GET['w'];
   $h = $_GET['h'];
   $x = @getimagesize($image);
   $sw = $x[0];
   $sh = $x[1];
   $new = @ImageCreateFromJPEG($image) or
   $new = @ImageCreateFromPNG($image) or
   $new = @ImageCreateFromGIF($image) or
   $new = false;
   if(!$new)
   {
      readfile($new);
   }
   else
   {
      $thumb = @ImageCreateTrueColor($w, $h);
      @ImageCopyResampled($thumb, $new, 0, 0, 0, 0, $w, $h, $sw, $sh);
      return $thumb;
   }
   return false;
}
$image = resizeimg($_GET['image']);
$watermark = imagecreatefrompng('watermark.png');
$watermark_width = imagesx($watermark);
$watermark_height = imagesy($watermark);
$dest_x = (imagesx($image) - $watermark_width)/2;
$dest_y = (imagesy($image) - $watermark_height)/2;
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 30);
imagejpeg($image);
imagedestroy($image);
imagedestroy($watermark);
?>