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McGePoint2d::rotateBy 方法

该点是绕点wrtPoint逆时针旋转ang角度。

C++
McGePoint2d& rotateBy(double angle, const McGePoint2d& wrtPoint = McGePoint2d::kOrigin);
参数 
说明 
double angle 
旋转角度 
const McGePoint2d& wrtPoint = McGePoint2d::kOrigin 
旋转中心 

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