PHP/Graphics Image/imagesetpixel

Points and Lines

   <source lang="html4strict">

<?php

   $width = 255;
   $height = 255;
   $image = imagecreatetruecolor($width, $height);
   for ($i = 0; $i <= $width; ++$i) {
           for ($j = 0; $j <= $height; ++$j) {
                   $col = imagecolorallocate($image, 255, $i, $j);
                   imagesetpixel($image, $i, $j, $col);
           }
   }
   header("Content-type: image/png");
   imagepng($image);
   imagedestroy($image);

?>

 </source>