public function getHomothety($factor)
    {
        $bounds = new LatLngBounds();
        $lat = $this->getCenterLat();
        $lng = $this->getCenterLng();
        $bounds->getNorthEast()->setLat($factor * $this->getNorthEast()->getLat() + $lat * (1 - $factor));
        $bounds->getSouthWest()->setLat($factor * $this->getSouthWest()->getLat() + $lat * (1 - $factor));
        $bounds->getNorthEast()->setLng($factor * $this->getNorthEast()->getLng() + $lng * (1 - $factor));
        $bounds->getSouthWest()->setLng($factor * $this->getSouthWest()->getLng() + $lng * (1 - $factor));

        return $bounds;
    }