/**
* @param ImageSize $originalSize
* @param ImageSize $newSize
* @return ImageSize
*/
private function getOptimalCrop(ImageSize $newSize)
{
$widthRatio = $this->getWidth() / $newSize->getWidth();
$heightRatio = $this->getHeight() / $newSize->getHeight();
if ($heightRatio < $widthRatio) {
return new ImageSize($this->getWidth() / $heightRatio, $this->getHeight() / $heightRatio);
} else {
return new ImageSize($this->getWidth() / $widthRatio, $this->getHeight() / $widthRatio);
}
}
/**
* @param $img
* @param $type
* @param ImageSize $newSize
* @param ImageSize $expectedSize
* @return resource
*/
private function crop($img, $type, ImageSize $newSize, ImageSize $expectedSize)
{
// Find center - this will be used for the crop
$cropStartX = $newSize->getWidth() / 2 - $expectedSize->getWidth() / 2;
$cropStartY = $newSize->getHeight() / 2 - $expectedSize->getHeight() / 2;
// Now crop from center to exact requested size
$imageCropped = imagecreatetruecolor($expectedSize->getWidth(), $expectedSize->getHeight());
switch ($type) {
case IMAGETYPE_PNG:
// integer representation of the color black (rgb: 0,0,0)
$background = imagecolorallocate($imageCropped, 255, 0, 0);
// removing the black from the placeholder
imagecolortransparent($imageCropped, $background);
// turning off alpha blending (to ensure alpha channel information
// is preserved, rather than removed (blending with the rest of the
// image in the form of black))
imagealphablending($imageCropped, false);
// turning on alpha channel information saving (to ensure the full range
// of transparency is preserved)
imagesavealpha($imageCropped, true);
break;
case IMAGETYPE_GIF:
// integer representation of the color black (rgb: 0,0,0)
$background = imagecolorallocate($imageCropped, 255, 255, 255);
// removing the black from the placeholder
imagecolortransparent($imageCropped, $background);
break;
}
imagecopyresampled($imageCropped, $img, 0, 0, $cropStartX, $cropStartY, $expectedSize->getWidth(), $expectedSize->getHeight(), $expectedSize->getWidth(), $expectedSize->getHeight());
return $imageCropped;
}
