CODEWITHSUNDEEP
phpimage
Izul Wahidin
Izul Wahidin

Reputation: 49

How to cut/split image into pieces [PHP]

I tried to create something like this site do (slice image into pieces)

<?php
$im = imagecreatefromjpeg('a.jpg');
$height = imagesy($im);
$width = imagesx($im);

$a = 20;
while($a<=$height){
    $slice[] = $a;
    $a+=20;
}
if($a>$height && end($slice) !== $height){
    $slice[] = $a+($height-$a);
}

for($i=0;$i<count($slice);$i++){
    $im2 = imagecrop($im, ['x' => 0, 'y' => 0, 'width' => $width, 'height' => $slice[$i]]);
    if ($im2 !== FALSE) {
        imagejpeg($im2, "test/example-$i.jpg");
        imagedestroy($im2);
    }
}
imagedestroy($im);
echo PHP_EOL .'Fck Yeah'. PHP_EOL;
?>

i wanted to slice image every 20 pixel verticaly, but code above only work on the first only :'( screenshot

Thanks

Upvotes: 2

Views: 2302

Answers (3)

Arash Besharat
Arash Besharat

Reputation: 36

You can replace

$im2 = imagecrop($im, ['x' => 0, 'y' => 0, 'width' => $width, 'height' => $slice[$i]]);

with

$im2 = imagecrop($im, ['x' => 0, 'y' => $slice[$i] * $i, 'width' => $width, 'height' => $slice[$i]])

Here is the magic: Your Y axis must be updated each time your loop runs. In your code, Y is always 0. That's why every time you crop a portion, it starts from the top of the main image. By replacing Y static value, Y dynamically changes each time and each image portion's Y axis starts from where the previous cropped portion was cut off.

Upvotes: 2

Sanjay Kamble
Sanjay Kamble

Reputation: 44

Inside imagecrop function the y coordinate is always set to 0. Hence while looping the image is cropped from initial coordinate y=0 to $slice[$i]

I would suggest to user following for loop instead:

for($i=0;$i<count($slice);$i++){
    $im2 = imagecrop($im, ['x' => 0, 'y' => $slice[$i] - $a, 'width' => $width, 'height' => $slice[$i]]);
    if ($im2 !== FALSE) {
        imagejpeg($im2, "test/example-$i.jpg");
        imagedestroy($im2);
    }
}

Upvotes: 2

Musa
Musa

Reputation: 97672

You're changing the height, you should be changing the y value

...
$a = 0;
while($a<=$height){
    $slice[] = $a;
    $a+=20;
}
if($a>$height && end($slice) !== $height){
    $slice[] = $a+($height-$a);
}
for($i=0;$i<count($slice);$i++){
    $im2 = imagecrop($im, ['x' => 0, 'y' => $slice[$i], 'width' => $width, 'height' => 20);
    if ($im2 !== FALSE) {
        imagejpeg($im2, "test/example-$i.jpg");
        imagedestroy($im2);
    }
}
...

Upvotes: 1

Related Questions