WindowsFormsApp/FrmLines.cs

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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 FrmLines : Form
    {
        #region 内部变量
        private Graphics _g = null;
        /// <summary>
        /// 背景图像
        /// </summary>
        private Image _imageCache = null;

        /// <summary>
        /// 单元格的宽(100%)
        /// </summary>
        private int _cellWidth_px = 100;
        /// <summary>
        /// 单元格的高(100%)
        /// </summary>
        private int _cellHeight_px = 100;

        private float _zoomOld = 1.0f;
        private float _zoom = 1.0f;
        private float _zoomMin = 0.1f;
        private float _zoomMax = 1000f;


        /// <summary>
        /// 表格的左上角
        /// </summary>
        private PointF _gridLeftTop = new PointF(200, 200);

        private bool _leftButtonPress = false;

        private PointF _mousePosition = new PointF(0, 0);
        #endregion

        public FrmLines()
        {
            InitializeComponent();

            //设置Paint参数以便能更好的控制Paint.
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);
            this.MouseWheel += Form1_MouseWheel;
        }

        private void Form1_MouseWheel(object sender, MouseEventArgs e)
        {
            var delta = e.Delta;
            if (Math.Abs(delta) < 10)
            {
                return;