public function getStartCrop($origin, $target, $focus)
    {
        $focusPx = round(($origin * $focus) / 100);
        $start = $focusPx - ($target / 2);

        if ($start <= 0) {
            return 0;
        }

        if (($start + $target) >= $origin) {
            return $origin - $target;
        }

        return $start;
    }