协同CAD系统的意愿保证算法

An Intention-preservation Algorithm for Collaborative CAD Systems

实时协同 CAD系统支持不同地域的设计人员通过网络同步高效地进行设计活动 ,它是传统 CAD系统的发展 ,其中操作意愿保证是一个复杂而又关键的问题 ,具有挑战性。文中讨论了基于图形对象的并发操作的冲突与相容关系 ,给出了一个新的操作意愿保证算法。该算法用直接依赖关系和对象状态概念确定操作的候选对象和对象的相容集合 。

Collaborative CAD system(CCADS) allows multip le designers from different fields to be connected by communication networks synch ronously or asynchronously to dedicate to their designing activities. The operat ional intention preservation is an important and complicated problem for CCADS i n a replicated architecture, and it is one of the most significant challenges in designing and implementing such a real-time cooperative system. In this paper, we first discuss the conflicting and compatible relationship among concurrent o perations. Then a new intention preservation algorithm is proposed for consisten cy maintenance by means of the graphic object replication strategy for solving t he concurrent operations with geometric conflict. A direct dependent relation be tween operations and object state are introduced for determining targeted object s applied to a new operation and the candidate group of the operation so as to p reserve the intention of conflicted operations.