/// <summary>
/// 坐标旋转。逆时针为正。
/// </summary>
/// <param name="centerXy"></param>
/// <param name="angleRad"></param>
/// <returns></returns>
public XY RotateRad(TwoDimVector centerXy, double angleRad)
{
double differX = X - centerXy[0];
double differY = Y - centerXy[1];
double x2 = differX * Math.Cos(angleRad) + differY * Math.Sin(angleRad);
double y2 = -differX *Math.Sin(angleRad) + differY * Math.Cos(angleRad);
return(new XY(x2 + centerXy[0], y2 + centerXy[1]));
}
public virtual XY Rotate(TwoDimVector centerXy, double angleDeg)
{
double angleRad = angleDeg * CoordConsts.DegToRadMultiplier;
return(RotateRad(centerXy, angleRad));
}
