在MapInfo中实现等值线图区域填充的快速算法  

Fast algorithm for region filling of isograms in MapInfo

作　　者：李井冈[1] 姚运生[1] 李贤华[2] 董曼[1] 李胜乐[1] 

机构地区：[1]中国地震局地震研究所,湖北武汉430071 [2]武汉大学计算机学院,湖北武汉430079

出　　处：《计算机工程与设计》2009年第7期1780-1783,1804,共5页Computer Engineering and Design

基　　金："十一五"国家科技支撑计划重点课题基金项目(2006BAC01B02-01-01);中国地震局地震研究所所长基金项目(IS200756042)

摘　　要：MapInfo是全球使用最为广泛的地理信息系统之一,然而,MapInfo Professional并没有提供等值线区域填充的工具。本文首先确定边界点序列,再利用边界点序列以及等值线形成封闭多边形。将封闭多边形按面积由大到小排序后,顺序确定闭合区的填充参数,最终完成对整个区域的颜色填充。该算法适用于任意封闭边界的等值线的填色,既可以用在MapInfo中等值线图的区域填充,也可以用于图片控件中绘图,还可以推广到其它等值线图填充中。Maplnfo is one of the most popular geographic information systems. However, it doesn＇ t offer the tools to realize the color fill of contour. The boundary points is determined, then the closed polygons is formed by using the boundary points and contours. After sorting the closed polygons according to their area, filling parameter are found out for each polygon. Finally, the whole region is colored. This algorithm is applicable to the color fill of any closed contour picture. It is used in the region color filling in Maplnfo, as well as in the drawing of picture box and other applications.

关 键 词：等值线 区域填充 地理信息系统 算法 MAPINFO 

分 类 号：TP311.132[自动化与计算机技术—计算机软件与理论]