曲线有很多种的。。。。

uf_curve.h
. Get the data of an arc with respect to the coordinate system the arc is in.
. Get the coordinates of a line with respect to the absolute coordinate system.
. Get the structure pointer corresponding to the specified curve id.
. Get the curve type and data for a specified curve structure.
. Free the curve structure pointer.
. Create an arc.
. Create a fillet between the specified curves.
. Create a line.
. Create a new spline curve.
帮助里面有很多你想要的，自己去看看吧，会有收获的