引用本文: 李霖, 徐庆荣. 计算机制图中线状符号配置的代数运算[J]. 武汉大学学报 ( 信息科学版), 1992, 17(1): 66-73.
Li Lin, Xu Qingyong. Algebra Operation for Drawing Linear Symbols in Computer-Aided Cartography[J]. Geomatics and Information Science of Wuhan University, 1992, 17(1): 66-73.
 Citation: Li Lin, Xu Qingyong. Algebra Operation for Drawing Linear Symbols in Computer-Aided Cartography[J]. Geomatics and Information Science of Wuhan University, 1992, 17(1): 66-73.

## Algebra Operation for Drawing Linear Symbols in Computer-Aided Cartography

• 摘要: 本文根据线状符号的特征,介绍代数运算在绘制地图线状符号中的应用。利用二元运算,将符号图案和线状要素的轴线作为运算元素,从而使符号的配置过程独立于具体的符号或图形。同一程序几乎能完成所有线状符号的绘制。利用变换作为运算定义的基础,分析了变换在符号配置中的特点,使二元运算的定义简单清晰。最后还根据运算的特点,介绍了解决线状符号在交叉处衔接的问题。

Abstract: This paper introduces algebra operation into drawing linear symbols on maps. Symbol patterns and axes of linear elements are regarded correspondingly as two kinds of components in two-component operation so that the process of allocating patterns is independent of various symbol patterns. Namely, one process can complate nearly all the linear symbols on maps. This process is based on transformations, which simplifies the definition of the two-component operation. Finaly, a method is put forward in this paper to handle the cross of linear symbols by means of the operation.

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