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McEdJig::acquireDist 方法 (double &, McGePoint3d&, OUT UserInputEventType*, bool*)
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www.mxdraw.com
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与用户交到，提取一个距离.
DragStatus acquireDist(double & dist, const McGePoint3d& basePnt, OUT UserInputEventType* pEventType = NULL, bool* pIsKeyboardInput = NULL);