摘要
对地理信息系统空间信息模型中要素模型的几何体结构进行了分析。充分运用和组合各种设计模式,在要素可视化设计和实现中,探讨采用组合模式与访问者模式相结合的形式,实现了异构几何体的聚集访问,采用合成模式与绘制策略模式相结合的形式,实现了要素与绘制的有机分离及各种绘制形式的充分支持,同时方便地实现了OpenGIS中有关要素几何体的抽象规范和相应的实现规范。
The thesis, through the analysis of geometry model architecture of geographical information system feature model, fully uses and combines various kinds of design pattern, probing into the combination of composite pattern and visitor pattern together for feature organization, makes it possible to access inhomogeneous geometry in geometry collects. Generally speaking, composite pattern and strategy pattern on rendering geometry for feature visualization enable us to separate rendering from feature naturally and sustain kinds of rendering, during the development and implementation of visualization of geography feature. Advantages of this kind of structure lie in satisfying easily OpenGis abstract specification and implement specification of simple geometry.
出处
《微机发展》
2005年第5期8-10,共3页
Microcomputer Development
基金
国家"863"计划资助项目(2003AA118010)
北京市科技计划项目(H030130040590)
上海市科研计划项目(03DZ19304)
国家科技攻关计划项目(2003BA808A16)
关键词
要素模型
设计模式
地理信息系统
可视化
feature model
design pattern
geographical information system (GIS)
visualization
