基于GDI+的地形图符号库中点符号的设计和实现

摘要

Topographic map symbol database is an important part of the digital drawing system and geographic infor-mation processing software. Symbol drawing is the key factor of the realization of map symbol database. Compared with the previous GDI,GDI+ has a more powerful image processing function as the latest Microsoft’ s graphics device Inter-face,bringing a new rendering technology. In the paper, the structure units of point symbols are hierarchical summarized based on analysis of GDI+,and then symbols are rendered by the combination of GDI functions. Finally,the method to improve topograhic symbols is proposed.%地形图符号库是数字化成图系统与地理信息处理软件中的一个重要组成部分。符号绘制是实现地图符号库的关键,GDI+作为微软推出的最新的图形设备接口,与之前的GDI相比,具有更加强大的图形图像处理功能,给地图符号带来了新的绘制技术。本文在分析GDI+的基础上,按照分层的思想归纳了点符号的构成单元,并通过组合GDI+函数绘制出符号,并在此基础上提出了一些地图符号绘制改进的方法。