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

getLength() double getLength ( ) const virtual 重载 Geometry . 被 NURBSCurve 重载.