PHP GD Punch
This example shows how to display punch in php gd.
This example shows how to display punch in php gd.<?php
$image = imagecreatefromjpeg("images.jpg");
$displacement = displacement($image);
$image = imagedisplace($image,$displacement);
header("Content-type: image/jpeg");
imagejpeg($image);
imagedestroy($image);
function displacement($i) {
$width = imagesx($i);
$height = imagesy($i);
for ($y=0;$y<$height;$y++) {
for ($x=0;$x<$width;$x++) {
$pos_x = $x - ($width/2);
$pos_y = $y - ($height/2);
$theta = atan2(($pos_y),($pos_x));
$radius = sqrt($pos_x*$pos_x + $pos_y*$pos_y);
$newRadius = $radius * $radius/(max(($width/2), ($height/2)));
$newX = ($width/2) + ($newRadius * cos($theta));
if ($newX > 0 && $newX < $width) {
$dis_x = $newX;
} else {
$dis_x = 0;
}
$newY = ($height/2) + ($newRadius * sin($theta));
if ($newY > 0 && $newY < $height) {
$dis_y = $newY;
} else {
$dis_y = 0;
}
$dis_x = ($dis_x < 0) ? $dis_x + $width : $dis_x;
$dis_x = ($dis_x >= $width) ? $dis_x - $width : $dis_x;
$dis_y = ($dis_y < 0) ? $dis_y + $height : $dis_y;
$dis_y = ($dis_y >= $height) ? $dis_y - $height : $dis_y;
$displacement['x'][$x][$y] = $dis_x;
$displacement['y'][$x][$y] = $dis_y;
}
}
return $displacement;
}
function imagedisplace($i,$displacement) {
$width = imagesx($i);
$height = imagesy($i);
$temp = imagecreatetruecolor($width,$height);
imagecopy($temp,$i,0,0,0,0,$width,$height);
for ($y=0;$y<$height;$y++) {
for ($x=0;$x<$width;$x++) {
$rgb = imagecolorat($temp,$displacement['x'][$x][$y],$displacement['y'][$x][$y]);
$a = ($rgb >> 24) & 0xFF;
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
$col = imagecolorallocatealpha($i,$r,$g,$b,$a);
imagesetpixel($i,$x,$y,$col);
}
}
imagedestroy($temp);
return $i;
}
?>
After running the program you will get the following output
