public function setGrid($XSize = 10, $YSize = 10)
    {
        for ($X = 0; $X <= $XSize; $X++) {
            for ($Y = 0; $Y <= $YSize; $Y++) {
                $this->Points[$X][$Y] = UNKNOWN;
            }
        }

        $this->GridSizeX = $XSize;
        $this->GridSizeY = $YSize;
    }