WindowsFormsApp/FrmDrawPanel.cs

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using log4net;
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 FrmDrawPanel : Form
    {
        /// <summary>
        /// 日志对象
        /// </summary>
        private static readonly ILog _log = log4net.LogManager.GetLogger("logSysApp");
        /// <summary>
        /// 图像文件
        /// </summary>
        //private string filePath = @"D:\\Images\\000141884_K722_D3008_2_29.jpg";
        private string rootPath = Application.StartupPath;
        private string filePath = Application.StartupPath + @"\pic\ss.jpg";
        /// <summary>
        /// 构造函数
        /// </summary>
        public FrmDrawPanel()
        {
            InitializeComponent();

            this.SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);

            this.UpdateStyles();

            // 绑定鼠标滚珠事件
            panelDraw.MouseWheel += PanelDraw_MouseWheel;
            // 对当前窗体启用双缓冲
            this.DoubleBuffered = true;

            // 初始化图像数据
            _ImageSrc = Image.FromFile(filePath);
        }
        /// <summary>
        /// 初始化完成后执行绘制
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void FrmDrawPanel_Load(object sender, EventArgs e)
        {
            // 根据窗口大小设置放缩比
            SetZoom(this.panelDraw.Size);
            // 执行绘制操作
            this.DrawImage();
        }
        /// <summary>
        /// 最小缩放比
        /// </summary>
        private const float ZOOM_MIN = 0.05F;
        /// <summary>