Abstract:Abstract. It is necessary to construct and manipulate the referenced coordinate system and the working plane in the free-hand sketching system in a natural way that meets the habits of stylists. This paper has presented some methods in the functions of the referenced coordinate system and the working plane, which apply the gesture commands sketched, and the combination of the hot-key and the digital pen to deal with the functions that differ from the traditional methods in the current CAD systems.
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