最近点对问题的图形界面实现，用户可以通过鼠标输入点集，也可以通过随机生成点集，程序会将最近的两个点用红色标示出来-Nearest point on the question of the realization of a graphical interface, users can mouse input point set, can also be randomly generated point set, the program will be the two most recent points, marked in red