OpenCVSharp - 随机数产生及文字

OpenCVSharp跑一遍OpenCV官方教程（全为手敲代码，如有雷同都是我的错）

随机数产生及图像上写文字

OpenCV教程链接：https://docs.opencv.org/4.5.0/df/d61/tutorial_random_generator_and_text.html

核心函数：

• RNG
• PutText

using OpenCvSharp;

namespace ConsoleApp1
{
    public class tutorial2:ITutorial
    {
        private int rows = 300, cols = 500;
        private int x_1 = 0, x_2 = 500;
        private int y_1 = 0, y_2 = 300;
        private int NUMBER = 100;
        private int showtime = 100;

        public void Run()
        {
            RNG rng = new RNG( 0xFFFFFFFF );
            Mat image = Mat.Zeros(rows, cols, MatType.CV_8UC3);

            Drawing_Random_Lines(image, "Random Lines", rng);
            
            Displaying_Random_Text(image, "Random Text", rng);
            Displaying_Big_End(image, "Big End", rng);

            //Cv2.WaitKey(0);
        }

        private void Drawing_Random_Lines(Mat image, string window_name, RNG rng)
        {

            Point pt1 = new Point();
            Point pt2 = new Point();
            for (int i = 0; i < NUMBER; i++)
            {
                pt1.X = rng.Uniform(x_1, x_2);
                pt1.Y = rng.Uniform(y_1, y_2);
                pt2.X = rng.Uniform(x_1, x_2);
                pt2.Y = rng.Uniform(y_1, y_2);

                Cv2.Line(image, pt1, pt2, randomColor(rng), rng.Uniform(1, 10), LineTypes.Link8);
                Cv2.ImShow(window_name, image);
                if (Cv2.WaitKey(showtime) > 0)
                    break;
            }            
        }
        private Scalar randomColor(RNG rng )
        {
            uint icolor = (uint)rng;
            return new Scalar(icolor & 255, (icolor >> 8) & 255, (icolor >> 16) & 255);
        }

        private void Displaying_Random_Text(Mat image, string window_name, RNG rng)
        {            
            for (int i = 1; i < NUMBER; i++)
            {
                Point org = new Point();
                org.X = rng.Uniform(x_1, x_2);
                org.Y = rng.Uniform(y_1, y_2);
                Cv2.PutText(image, "Testing text rendering", org, (HersheyFonts)rng.Uniform(0, 8),
                         rng.Uniform(0, 100) * 0.05 + 0.1, randomColor(rng), rng.Uniform(1, 10), LineTypes.Link8);
                Cv2.ImShow(window_name, image);
                if (Cv2.WaitKey(showtime) > 0)
                    break;
            }            
        }

        private void Displaying_Big_End(Mat image, string window_name, RNG rng)
        {
            int baseline;
            Size textsize = Cv2.GetTextSize("OpenCV forever!", HersheyFonts.HersheyComplex, 2, 5, out baseline);
            Point org = new Point( (cols - textsize.Width) / 2, (rows - textsize.Height) / 2 );
            
            Mat image2;
            for (int i = 0; i < 255; i += 2)
            {
                image2 = image - Scalar.All(i);
                Cv2.PutText(image2, "OpenCV forever!", org, HersheyFonts.HersheyComplex, 2,
                       new Scalar(i, i, 255), 5, LineTypes.Link8);
                Cv2.ImShow(window_name, image2);
                if (Cv2.WaitKey(showtime) > 0)
                    break;
            }
            
        }
    }
}