一款用VB编写的绘图软件，用户可通过相应修改，实现自己要的功能-VB prepared with a mapping software, the user can be modified accordingly to achieve the functions of their own

VB 自编一个绘图功能的控件 能够对给出的点进行拖拉 改变曲线-VB made a drawing control function to give the point of change curve