ArcofCircle2D ArcofCircle2D ArcofCircle2D calculateCircleCenter calculateStartandEndPoint copy getCenterPoint getDirection getEndAngle getEndPoint getExtrema getLength getMidPoint getRadius getStartAngle getStartPoint isClockWise isClosed isInArc mCenterPoint mClockWise mEndAngle mEndPoint mRadius mSecondPoint mStartAngle mStartPoint setCenterPoint setDirection setEndAngle setRadius setStartAngle

setDirection() void setDirection ( bool  bClockWire ) 设置方向 设置二维圆弧方向 参数 [in] bClockWire 方向，true顺时针，false逆时针