Interaction Management in CAD (Computer Aided Design) Systems with a History Mechanism

摘要

User friendliness in computer aided design systems is considered. A concept called model derivation, which describes how the user treats the model in terms of its evolution is introduced. To construct and use model derivation a history mechanism which keeps and manipulates the history of the modeling process is proposed. The history mechanism manages high level interactions by introducing powerful symbolic computation to manipulate the history. Since the history representation is based on the operation's syntax and separated from the internal model representation, it is easy to apply the history mechanism to any modeling system which uses established techniques. Thus the system designer can easily introduce model derivation without reducing efficiency of the implementation.