基于GDI^+的复杂线状符号优化算法  

Optimization algorithm of complex linear symbols based on GDI^+

作　　者：秦佐[1] 周晓光[1] 刘军生[1] 周辉[1] 

机构地区：[1]中南大学测绘与国土信息工程系,长沙410083

出　　处：《测绘科学》2011年第4期183-185,共3页Science of Surveying and Mapping

基　　金："十一五"国家科技支撑计划项目(2006BAJ09B02)

摘　　要：本文针对用GDI+开发地图图式符号库时,绘制复杂线状符号存在的转角问题,即在线段/线段连接处标注符号不均匀的问题,提出了一种基于单位距离的线状符号绘制方法。设计了参数化的数据结构,提出基于单位距离的符号定位点的快速确定算法,较好地解决了利用GDI+开发地图线状符号时遇到的转角问题。该优化方法不但提高了复杂线状符号的显示效果,在符号显示效率上也有所提高。该方法已经成功运用于村镇增量信息更新系统中。In this paper, there was a corner-problem using GDI ＋ to implement develop complex linear symbols in cartographic symbols for fundamental scale maps, i.e. , the marked symbol is not marked uniformly at the junction of line segments. In order to solve the problems, the authors presented a method to draw linear symbols based on unit distance. Furthermore, the special data struc- ture was designed, and the algorithm used to determine the marked point considering the junction of line segments were presented in this paper. The modified method presented in this paper not only solved the corner-problem, the efficiency of drawing the complex line- ar symbols also was improved. This method has been successfully used in the e-Village incremental updating system.

关 键 词：线状符号 转角问题 定位点 

分 类 号：P282[天文地球—地图制图学与地理信息工程]