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

setStartAngle() void setStartAngle ( double  angle ) 设置起始角度 设置二维圆弧起始角度 参数 [in] angle 起始角度