多边形拓扑演示的VB程序和代码。程序对输入的图形文件基本数据进行拓扑构建，生成结点、线段、弧段、多边形等数据结构，并显示图形和结构数据。程序内包含了多个常用的拓扑生成算法，供参考学习。-Program of the polygon topology demonstration VB code. Topology construction procedures for the basic data of the input graphics file, the data structure of the generated nodes, segments, arcs, polygons, etc., and display graphics and structural data. The program contains a number of commonly used topology generation algorithm for reference learning.