BSplineCurve BSplineCurve BSplineCurve copy getDegree getKnots getLength getMultiplicities getPeriodic getPoles getRational isClosed mDegree mKnots mMultiplicities mPeriodic mPoles mRational Reverse setDegree setKnots setMultiplicities setPeriodic setPoles setRational ~BSplineCurve

getPeriodic() bool getPeriodic ( ) const 获取是否周期性 获取三维B样条曲线是否周期性 返回 true为是，false为否