- /// <summary>
- /// 以中心点旋转Angle角度
- /// </summary>
- /// <param name="center">中心点</param>
- /// <param name="p1">待旋转的点</param>
- /// <param name="angle">旋转角度（弧度）</param>
- private void PointRotate(Point center, ref Point p1, double angle)
- {
- double x1 = (p1.X - center.X) * Math.Cos(angle) + (p1.Y - center.Y) * Math.Sin(angle) + center.X;
- double y1 = -(p1.X - center.X) * Math.Sin(angle) + (p1.Y - center.Y) * Math.Cos(angle) + center.Y;
- p1.X = (int)x1;
- p1.Y = (int)y1;
- }