| 摘要 |
In a graphical editing system, a user may both reshape and/or abort a command gesture already drawn. The gesture is retraced by the user by backtracing over the gesture, i.e., drawing backwards over the gestural mark. As the user traces backwards over the gesture, the system detects a reverse in direction, and the gesture is erased. When the user draws in a direction that is not tracing backwards over the gesture, the change in direction is sensed and the gesture is continued. To abort a gesture, it is retraced back to its origin.
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