public function toPdfArray()
    {
        $array = new PdfArray();
        $array->value[] = PdfNumeric::create($this->llx);
        $array->value[] = PdfNumeric::create($this->lly);
        $array->value[] = PdfNumeric::create($this->urx);
        $array->value[] = PdfNumeric::create($this->ury);

        return $array;
    }