function getCellsInRectangle(topLeft, bottomLeft)
    --topLeft -> cell in top left of rectangle
    --bottomLeft -> cell in bottom left of rectangle
    local cells = {}
    for x = topLeft.X, bottomLeft.X do
        for y = topLeft.Y, bottomLeft.Y do
            cells[#cells + 1] = CPos.New(x, y)
        end
    end
    return cells
end