WindowsFormsApp/FrmDrawImage.cs

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using Emgu.CV.UI;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApp
{
    public partial class FrmDrawImage : Form
    {
        public FrmDrawImage()
        {
            InitializeComponent();

            this.imageBox1.MouseWheel += Form1_MouseWheel;
        }
        /// <summary>
        /// 当前图像的放缩比例
        /// </summary>
        private double _CurrentZoomScale = 1.0D;
        /// <summary>
        /// 处理鼠标事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_MouseWheel(object sender, MouseEventArgs e)
        {
            if (e.Delta > 0)
            {
                _CurrentZoomScale *= 1.5;
            }
            else
            {
                _CurrentZoomScale *= 0.5;
            }
            // 设置放缩比例
            this.imageBox1.SetZoomScale(_CurrentZoomScale, new Point(100, 200));
            //this.imageBox1.Show();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //ImageBox

            imageBox1.FunctionalMode = ImageBox.FunctionalModeOption.Minimum;

            //imageBox1.FunctionalMode = ImageBox.FunctionalModeOption.PanAndZoom;
            //this.imageBox1.SizeMode = PictureBoxSizeMode.Zoom;

            this.imageBox1.ImageLocation = Application.StartupPath + @"\\pic\\ss.jpg";
        }

        private void imageBox1_OnZoomScaleChange(object sender, EventArgs e)
        {
            Console.WriteLine(this.imageBox1.ZoomScale);
            //Console.WriteLine(string.Format("当前图像大小,ZoomScale:{0},Width:{1},Height:{2}", this.imageBox1.ZoomScale, this.imageBox1.Width, this.imageBox1.Height));