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介绍用三次样条函数的转角法直接求出型值点的一阶导数值;应用包络理论,获得共轭型线,从而使型线的设计灵活多样。
In this paper, we introduce the direct derivative of the cubic spline function to find the first derivative value of the shape point. By using the envelope theory, we get the conjugate line, which makes the design of the line flexible.