BezierCurve2D BezierCurve2D BezierCurve2D copy getDegree getLength getMultiplicities getPeriodic getPoles getRational isClosed mDegree mMultiplicities mPeriodic mPoles mRational setDegree setMultiplicities setPeriodic setPoles setRational ~BezierCurve2D

getLength() double getLength ( ) const virtual 获取长度 获取二维曲线长度 重载 Curve2D .