解决了由直线和圆弧构成的平面轮廓精确重构问题，满足轮廓各段之间位置连续以及相切条件。
Accurate reconstruction of planar contour mixed with straight lines and arcs is achieved with position or tangent continuity.
利用拉格朗日乘子法求解二次曲线和二次曲面之间的最小距离，给出了曲线与曲面相切的条件。
With the Lagrange multiplier method, the minimum distance of the center of a circle and a quadric surface was provided and the tangency condition of curve and surface was given.
本文还给出了曲线与其特征多边形各边相切的条件。
The condition in which the curves contact with each edge of characteristic polygon is also given.
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