arcmap＋VB的例子，一共23个，包括属性统计、打开属性表、合并图层、图层排序、绘制文字、绘制多边形、Geo注册等，完整详细。

计算两直线交点，计算多边形交点，绘制多边形，绘制等高线，测试裁剪多边形等测绘算法-Calculation of the intersection of the lines, calculating polygon intersection point, draw a polygon, draw contour test cutting polygons mapping algorithm