class TwoDimensionalGrid:

    def __init__(self, cell_size):
        self._cell_size = cell_size
        self._initial_cell_size = cell_size

    def set_cell_size(self, cell_size):
        self._cell_size = cell_size

    def get_real_pixel_point(self, three_dimensional_point):
        return three_dimensional_point[1]*self._cell_size, three_dimensional_point[2]*self._cell_size

    def get_cell_size(self):
        return self._cell_size

    def set_cell_size(self, size):
        self._cell_size = size

    def get_ratio(self):
        return self._cell_size/self._initial_cell_size
class TwoDimensionalGrid:

    def __init__(self, cell_size):
        self._cell_size = cell_size
        self._initial_cell_size = cell_size

    def set_cell_size(self, cell_size):
        self._cell_size = cell_size

    def get_real_pixel_point(self, three_dimensional_point):
        return three_dimensional_point[1]*self._cell_size, three_dimensional_point[2]*self._cell_size

    def get_cell_size(self):
        return self._cell_size

    def set_cell_size(self, size):
        self._cell_size = size

    def get_ratio(self):
        return self._cell_size/self._initial_cell_size