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

setRational() void setRational ( bool  rational ) 设置是否有理 设置二维B样条曲线是否有理 参数 [in] rational 是否有理