Emgu.CV C# WinFrom 鼠标画图



Emgu.CV C# WinFrom 鼠标画图

在窗口中添加picturebox1，在picturebox1中画图

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Threading;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;
using Emgu.CV.Util;

namespace EmguCV
{
    public partial class Form1 : Form
    {
        bool mousedown = false;
        int pre_x = 0, pre_y = 0;
        int x = 0, y = 0;
        Image<Bgr, byte> a;

        public Form1()
        {
            InitializeComponent();
            a = new Image<Bgr, byte>(800, 800, new Bgr(255, 255, 255));

            pictureBox1.Image = a.Bitmap;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //Mat img;
            //img = CvInvoke.Imread("test.jpg", ImreadModes.Color);
            //CvInvoke.Imshow("test", img);

            try
            {
           
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mousedown = true;
                pre_x = e.X;
                pre_y = e.Y;
            }
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (mousedown == true)
            {
                x = e.X;
                y = e.Y;
                CvInvoke.Line(a, new Point(pre_x, pre_y), new Point(x, y), new MCvScalar(255, 0, 0), 2);
                pre_x = x;
                pre_y = y;
                pictureBox1.Image = a.Bitmap;
            }
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
                mousedown = false;
        }

    }
}