本程序主要实现人机交互，可进行画点、线、面、以及书写英文字母的功能。当右击鼠标时，还可选择清空屏幕和退出程序的功能。-The main achievement of human-computer interaction process, can be draw points, lines, surfaces, and the function of writing letters. When right-click the mouse, can also choose to clear the