public function setZoomLevel($zoomLevel)
	{
		$zoomLevel = (int) $zoomLevel;

		if ($zoomLevel < 0 || $zoomLevel > 100)
		{
			throw new \InvalidArgumentException('Zoom level must be between 0 and 100!');
		}

		$this->zoomLevel = $zoomLevel;

		return $this;
	}