摘要
作者对于凸的特征多边形，讨论了一类与多边形第。边相切的保凸参数三次曲线，得到了几个充分必要条件；给出了Ｔｉｍｍｅｒ曲线与第一边相切的切点范围；找出了Ｔｉｍｍｅｒ曲线为什么出现拐点．
A few necessary and sufficient conditions are obtained in the discussion of a kind of convexity preserving plane parametric cubic curves which contact the second edge of characteristic polygon when convex characteristic polygons are concerned The position of Timmer curves contacting the recond edge of characteristic polygon are also given out,and thus the reason is found out why Timmer curves have inflection points
关键词
参数三次曲线
Timmer曲线
计算几何
保凸性
convexity preserving plane parametric cubic curves
timmer curves
computational geometry
