/**
* Calculate the anchor such that the crop will not exceed the image boundary.
*
* Given the top-left anchor (in pixels), the crop size and the image size,
* reposition the anchor to ensure the crop area does not exceed the bounds of
* the image.
*
* @param array $anchor
* An array with the keys 'x' and 'y'. Values are in pixels representing the
* top left corner of the of the crop area relative to the image.
* @param ImageInterface $image
* The image to which the crop area must be constrained.
* @param CropInterface $crop
* The crop object used to define the crop.
*
* @return array
* An array with the keys 'x' and 'y'.
*/
protected function constrainCropArea($anchor, ImageInterface $image, CropInterface $crop) {
$image_size = [
'width' => $image->getWidth(),
'height' => $image->getHeight(),
];
$crop_size = $crop->size();
// Ensure that the crop area doesn't fall off the bottom right of the image.
$anchor = [
'x' => $anchor['x'] + $crop_size['width'] <= $image_size['width'] ? $anchor['x'] : $image_size['width'] - $crop_size['width'],
'y' => $anchor['y'] = $anchor['y'] + $crop_size['height'] <= $image_size['height'] ? $anchor['y'] : $image_size['height'] - $crop_size['height'],
];
// Ensure that the crop area doesn't fall off the top left of the image.
$anchor = [
'x' => max(0, $anchor['x']),
'y' => max(0, $anchor['y']),
];
return $anchor;
}
