基于AutoCAD的全参数化绘图系统CBA

An AutoCAD-Based Wholly Parametric Drawing System CBA

设计开发了一个全参数化的绘图系统CBA,该系统可以独立外挂于其它任何的平台,并在AutoCAD平台上得以实现。文中分析了CBA的框架结构和CBADB的层次结构、CBA基本的几何对象和约束对象以及对象的永久存储,探讨了CBA系统中约束的动态管理,约束的显示、查看、添加、删除操作原理,以及Undo/Redo机制和拖动原理。

We design and develope a wholly parametric drawing system CBA, the system can independently exist and act on any other platforms, we take it into practice on AutoCAD platform. This paper analyse the frame structure of CBA, the hiberarchy of CBADB, the fundamental geometry object and constraint object of CBA, the permanent storage of object, this paper also research the dynamic management of constraints in CBA system, research the principle of displaying constraints?checking constraints? adding constraints? deleting constraints and Undo/Redo, drag mechanism.