Pen gesture is one of the most important interactive styles in Pen-basedinterface.
笔手势是笔式用户界面中的一种重要的交互方式。
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To solve this problem, this paper designs and implements a geometric teaching system based on PUI (Pen User Interface), and applies technique of bidirectional geometrical constraint to this system.
The technique system of intelligent sketching is presented, including the penbased natural gesture interface, free-hand sketching input, sketching recognition and sketch based solid modeling.