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; }