This software system is consisted of two major blocks : computing block and drawing block 本系统的软件开发共两大部分：设计计算程序的开发和绘图程序的开发。
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2 . professional drawing database the cpcad develops a city planning professional drawing database on multi - fork tree structure through which can easily manage and use the standard drawing block in common use . 3 专业图形库管理本系统开发了一个基于多叉树结构的城市规划设计专业图形库，来管理与使用城市规划设计中用到的标准、规范的图块。
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The modular design such as the technical foundation , obtaining of the entity coordinates data , extending data ’ s storage and management , automatic production technology of coordinates table which were based on drawing block were emphatically studied 基于模块化设计技术基础,重点研究了autocad中实体坐标数据的获取,扩展数据的存储与管理,基于图块的坐标表自动生成技术。
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Objectarx software kit is used for working drawing . drawing block classes are designed for drawing . when the result of the data computing is passed into painting block , the drawing block objects are created and the objects are added into system graphic database , thus the working drawing is auto _ drawn 同样，对绘图程序的开发，也是先定制了一系列图块类，整个施工图就由这些图块类构成；在类定制完毕后，将计算程序的计算结果传入绘图程序中，然后创建图块类的对象，将这些对象加入系统图形数据库，自动生成施工图。
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