构建闭合的样条曲线

笑宇

Spline(

System.Int32 degree,

System.Boolean rational,

System.Boolean closed,

System.Boolean periodic,

Autodesk.AutoCAD.Geometry.Point3dCollection controlPoints,

Autodesk.AutoCAD.Geometry.DoubleCollection knots,

Autodesk.AutoCAD.Geometry.DoubleCollection weights,

System.Double controlPointTolerance,

System.Double knotTolerance)

，怎样用上述构造函数，创建闭合的样条曲线？最好能有个参照的例子.在此先谢谢了。