GPS卫星定位源码VB,先进的定位系统

用VB实现交互式CAD系统，能够绘制简单图形，如直线段，矩形，圆形等；绘制独立符号，如GPS点，水准点等；绘制线状符号，如陡坎，城墙等。-With VB interactive CAD system, able to draw simple graphics, such as line segments, rectangles, circles, etc. draw independent symbols, such as GPS points, level points drawn lin