引用本文: 艾自兴, 颜辉武. 专题制图系统中面状符号自动绘制的新算法——晕线图案法[J]. 武汉大学学报 ( 信息科学版), 1992, 17(4): 57-62.
Ai Zixing, Yan Huiwu. A New Algrithm of Automatically Plotting the Area Symbols in the Thematic Mapping Systems[J]. Geomatics and Information Science of Wuhan University, 1992, 17(4): 57-62.
 Citation: Ai Zixing, Yan Huiwu. A New Algrithm of Automatically Plotting the Area Symbols in the Thematic Mapping Systems[J]. Geomatics and Information Science of Wuhan University, 1992, 17(4): 57-62.

## A New Algrithm of Automatically Plotting the Area Symbols in the Thematic Mapping Systems

• 摘要: 在专题制图系统中,面状符号的自动绘制具有重要意义。晕线法是绘制面状符号较为常用的方法,然因其图形结构简单,对于绘制较为复杂的专题地图,分级,对比效果均不够理想,为此,本文提出了晕线图案法。这种方法以晕线法为基础,用不同的晕线,虚晕线的适当运算构成图案,从而实现面状符号的自动输出,本方法图案设计简单,既可交互式输出也可自动生成图案,既保留了晕线法优点,又实现了面状符号的多样化输出。利用晕线图案法,笔者绘制了黄土高原微机地理信息系统专题图部分,并取得了较理想的输出效果。

Abstract: The area symbol's automatic plotting plays an important role in the thematic mapping systems. Hatching method is often used in plotting area symbols. However, because of its simple graphic construction, when it is used to plot a complicated map, the effects of classification and contrast are not very optimal. So, the authors put forward a new method——the pattern-hatching method in this paper. This new method is based on the hatching method, using different kinds of hatching lines, break hatching lines to form many new patterns and realize the automatic output of the area symbols. The design of this pattern-hatching method is very simple and practical. Not only could it be in interactive output, but also could automatically form different kinds of patterns. On the one hand, it has the advantages of the hatching method, on the other hand, it also has the advantages of itselfautomatically forming the various area symbols. With the pattern-hatching method, the authors plotted successffully the thematic maps of the LPMCGIS-the Lesso Plateau Microcomputer Geographical Information System, and gain a very optimal effect.

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