BSplineCurve2D BSplineCurve2D BSplineCurve2D copy getDegree getKnots getLength getMultiplicities getPeriodic getPoles getRational isClosed mDegree mKnots mMultiplicities mPeriodic mPoles mRational setDegree setKnots setMultiplicities setPeriodic setPoles setRational ~BSplineCurve2D

getLength() double getLength ( ) const virtual 获取长度 获取二维B样条曲线的长度 重载 Curve2D . 被 NURBSCurve2D 重载.