任意一个点A(x,y)围绕任意一个点B(a,b)旋转任意角度后的坐标值

/// <summary>
/// 求p围绕pCenter旋转angle后的坐标值
/// </summary>
/// <param name="p">需要旋转的坐标</param>
/// <param name="pCenter">围绕的坐标</param>
/// <param name="angle">旋转角度，大于0逆时针，小于0顺时针</param>
/// <returns></returns>
private static Point calcNewPoint(Point p, Point pCenter, float angle)
{
	// calc arc   
	float l = (float)((angle * Math.PI) / 180);
 
	//sin/cos value  
	float cosv = (float)Math.Cos(l);
	float sinv = (float)Math.Sin(l);
 
	// calc new point  
	float newX = (float)((p.X - pCenter.X) * cosv - (p.Y - pCenter.Y) * sinv + pCenter.X);
	float newY = (float)((p.X - pCenter.X) * sinv + (p.Y - pCenter.Y) * cosv + pCenter.Y);
	return new Point((int)newX, (int)newY);
}

public double GetAngle(MapPoint pntFirst, MapPoint pntNext)
        {
            double dRotateAngle = Math.Atan2(Math.Abs(pntFirst.X - pntNext.X), Math.Abs(pntFirst.Y - pntNext.Y));
            if (pntNext.X >= pntFirst.X)
            {
 
                if (pntNext.Y >= pntFirst.Y)
                {
                                    }
                else
                {
                    dRotateAngle = Math.PI - dRotateAngle;
                }
            }
            else            {
 
                if (pntNext.Y >= pntFirst.Y)
                {
                    dRotateAngle = 2 * Math.PI - dRotateAngle;
                }
                else                {
                    dRotateAngle = Math.PI + dRotateAngle;
                }
            }
            dRotateAngle = dRotateAngle * 180 / Math.PI;
            return dRotateAngle;
        }