VC实现画板程序，功能和界面全部模仿于Windows自带的画图板，界面如截图。功能主要有： 手绘线、简单图形、文字输入、图块拖放、重复撤销、画面缩放、打开保存图片文件-VC drawing board procedures, functions, and interfaces to imitate all the drawing board comes in Windows, such as screenshots interface. Main functions are: hand-draw