| 摘要 |
<p>A CAD system for team-based design provides an undo function and a redo function for execution by each designer during team-based design. A database server comprises a component DB and history DB provided for sharing in the same team, and a history DB manager for collecting history information of operator-performed operations and recording into the history DB. The history information includes the time an operation was performed, the element that is the object of the operation, the type of operation, the designer who performed the operation, and a validity flag of the history information. When a designer executes the undo function in the operator reference mode, the history information of the operations performed by the designer is searched, only the last operation performed by the designer is canceled, and the operations by the other designers in the same team are not canceled. Furthermore, when a designer executes the redo function, an operation that was canceled by the designer executing the last undo function is redone and the operations by the other designers in the same team are not redone. <IMAGE></p> |
