摘要
运用面向对象技术和模板方法实现了普通地图点、线、面状符号的设计与建库，对其设计与建库思路及关键技术进行了分析，介绍了开放式的可视化设计环境。
In this paper, the design and establishment of point, line and area symbol on topographic map have been discussed by use of object oriented technique and template method. The main idea of template method is that the smallest cyclic entity of point symbol, line symbol and the smallest unit of area symbol are put across template, and then template can be combined or transformed according to the spatial data to be symbolized to create point symbol, line symbol and area symbol. Point symbol and area symbol can be acted as an especial line symbol according to the features of point symbol, line symbol and area sybmbol on geometrical distribution and the idea of template method. Symbol template can be put into the symbol base after it has been designed. The symbol can be edited and maintained in the symbol base. The designing way, establishment of symbol base and its key technique are also analyzed. Also the opening visual designing environment of map symbol has been introduced. The design of symbol is a stitch in time saves nine with a convenient and agile design means which provides many edit tools and methods, realize the visual design of symbol, accomplish the symbol design quickly and expediently. Visual designing environment improves the size and position precision of symbol by the view management and active ruler.
出处
《武汉测绘科技大学学报》
CSCD
1999年第3期259-261,271,共4页
Geomatics and Information Science of Wuhan University
基金
国家测绘局"九五"科技攻关项目
关键词
面向对象
符号
符号库
普通地图
地图符号
opening
object oriented
template
symbol
symbol base
visual designing environment
