calculateBorders clone DxfEllipse getAngle getAngle1 getAngle2 getCenter getDirection1 getDirection2 getEllipseAngle getEllipsePoint getEndPoint getMajorPoint getMajorRadius getMiddlePoint getMinorRadius getNearestEndpoint getNearestMiddle getNearestPointOnEntity getRatio getStartPoint isArc isEllipticArc isReversed m_Angle1 m_Angle2 m_CenterPoint m_MajorAngle m_MajorPoint m_MajorRadius m_MinorRadius m_Ratio m_Reversed move rotate setAngle1 setAngle2 setCenter setMajor writeDxf ~DxfEllipse

clone() virtual DxfEntity * clone ( ) overridevirtual 纯虚函数, 拷贝对象 实现了 DxfEntity.