public function setTransform($a, $b, $c, $d, $e, $f) 
    {
        if (gettype($a) != 'integer' ||
            gettype($b) != 'integer' ||
            gettype($c) != 'integer' ||
            gettype($d) != 'integer' ||
            gettype($e) != 'integer' ||
            gettype($f) != 'integer'
        ) {
            return;
        }

        $this->transform = new Matrix($a, $b, $c, $d, $e, $f);
    }