基于VB的简单CAD 功能简单 实现绘制直线圆形 圆弧 矩形 添加文字的功能

vb画圆弧，不是调命令circle是自己编写的程序，实现cad画图功能！-vb painting arc, circle order is not the tune I have written procedures, to achieve cad drawing function!

VB编写的CAD功能的软件，全部算法控件都有代码,对VB技巧与数学几何算法及VB绘图都是值得学习的地方-VB, CAD software features, all algorithms have the control code, and VB geometric algorithms and mathematical skills and VB graphics are worthy of a place to learn