先用红点标出旋转中心的位置，用绿点标出转换前的位置
变换之后，红圈圈出新的坐标
改变旋转中心，角度，放大系数：
结果：
源码：
public void Run(){Mat mat = new Mat(800, 800, MatType.CV_8UC3);//网络线for (int i = 0; i <= 10; i++){Cv2.Line(mat, new Point(i * 100 + 50, 0), new Point(i * 100 + 50, 800), new Scalar(60,60,60));Cv2.Line(mat, new Point(0, i * 100 + 50), new Point(800, i * 100 + 50), new Scalar(60, 60, 60));Cv2.Line(mat, new Point(i * 100, 0), new Point(i * 100, 800), Scalar.Gray );Cv2.Line(mat, new Point(0, i * 100), new Point(800, i * 100), Scalar.Gray );}//旋转中心Point center = new Point(300, 400);Cv2.Circle(mat, center, 5, Scalar.Red, -1);Cv2.ArrowedLine(mat, center, center+new Point(100,0), Scalar.Green);Cv2.ArrowedLine(mat, center, center + new Point(0, 100), Scalar.Red);//测试点Point p = new Point(250, 450);Cv2.Circle(mat, p, 5, Scalar.Lime, -1);Cv2.ImShow("T", mat);Mat mat1 = MatRotate(mat, center, -65, p);Cv2.ImShow("T1", mat1);Cv2.WaitKey();
}private Mat MatRotate(Mat src, Point center, float angle, Point point){Mat dst = new Mat();Mat rot = Cv2.GetRotationMatrix2D(center, angle, 1.5);Console.WriteLine(Cv2.Format(rot, FormatType.Python));Cv2.WarpAffine(src, dst, rot, src.Size());var x = point.X * rot.At<double>(0, 0) + point.Y * rot.At<double>(0, 1) + rot.At<double>(0, 2);var y = point.X * rot.At<double>(1, 0) + point.Y * rot.At<double>(1, 1) + rot.At<double>(1, 2);x = Math.Round(x, 0);y = Math.Round(y, 0);Point p = new Point(x, y);Cv2.Circle(dst, p, 10, Scalar.Red, 1);return dst;}