[人工智能]opencv winform任意图形填充

在winform里面，没有默认的任意图形填充函数，但opencv里面有，结合opencv可以轻松实现图形填充。代码如下：

引入库

using OpenCvSharp;
using OpenCvSharp.Extensions;

1、创建类数据成员bitmap

Bitmap bitmap;

2、在初始化后为pictureBox1的image和bitmap初始化（加上1，代码如下）

itmap bitmap;
        public Form1()
        {
            InitializeComponent();
            bitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height);
            
            pictureBox1.Image = bitmap;
        }

3、在pictureBox上面对image进行绘图

var g = Graphics.FromImage(pictureBox1.Image) ;
            Pen p = new Pen(Color.Red,3);
            var rect = new Rectangle(0,0, 400,400);
            var rect1 = new Rectangle(50, 50, 300, 300);
            g.DrawEllipse(p, rect);
            g.DrawEllipse(p, rect1);
            g.Dispose();
            pictureBox1.Refresh();

4、填充

bitmap = (Bitmap)pictureBox1.Image;
            Mat img1= BitmapConverter.ToMat(bitmap);
            Cv2.CvtColor(img1, img1, ColorConversionCodes.BGRA2BGR);
            var pt1 = new OpenCvSharp.Point(150, 25);
            Cv2.FloodFill(img1, pt1, Scalar.Red);
            bitmap = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(img1);
            pictureBox1.Image = bitmap;
            pictureBox1.Refresh();

显示结果如下：

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