GDI绘制坐标系（画出了横坐标、纵坐标、网格线等等）

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace GdiCoordinateSystem
{

    public partial class MainForm : Form
    {
        private Bitmap m_Bmp;
        private Graphics m_Graphics;
        private float m_Scale = 0.0f;           //放大倍数
        private Point m_CanvasOrigin;           //屏幕坐标原点
        private float m_FillWidth = 2.1f;       //绘制鼠标点时正方形的宽度

        public MainForm（）
        {
            InitializeComponent（）;
        }

        private void MainForm_Load（object sender EventArgs e）
        {
            m_Bmp = new Bitmap（Pb_CoordinateSystem

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2019-04-28 09:23  GdiCoordinateSystem\
     目录           0  2019-04-28 09:22  GdiCoordinateSystem\.vs\
     目录           0  2019-04-28 09:22  GdiCoordinateSystem\.vs\GdiCoordinateSystem\
     目录           0  2019-04-28 09:22  GdiCoordinateSystem\.vs\GdiCoordinateSystem\v14\
     文件       48128  2019-04-29 17:45  GdiCoordinateSystem\.vs\GdiCoordinateSystem\v14\.suo
     目录           0  2019-04-29 15:18  GdiCoordinateSystem\GdiCoordinateSystem\
     文件        3767  2019-04-28 11:16  GdiCoordinateSystem\GdiCoordinateSystem\GdiCoordinateSystem.csproj
     文件        2397  2019-04-28 09:38  GdiCoordinateSystem\GdiCoordinateSystem\MainForm.Designer.cs
     文件       22310  2019-04-29 15:18  GdiCoordinateSystem\GdiCoordinateSystem\MainForm.cs
     文件        5817  2019-04-28 09:38  GdiCoordinateSystem\GdiCoordinateSystem\MainForm.resx
     文件         503  2019-04-28 11:16  GdiCoordinateSystem\GdiCoordinateSystem\Program.cs
     目录           0  2019-04-28 09:22  GdiCoordinateSystem\GdiCoordinateSystem\Properties\
     文件        1346  2019-04-28 09:22  GdiCoordinateSystem\GdiCoordinateSystem\Properties\AssemblyInfo.cs
     文件        2851  2019-04-28 09:22  GdiCoordinateSystem\GdiCoordinateSystem\Properties\Resources.Designer.cs
     文件        5612  2019-04-28 09:22  GdiCoordinateSystem\GdiCoordinateSystem\Properties\Resources.resx
     文件        1106  2019-04-28 09:22  GdiCoordinateSystem\GdiCoordinateSystem\Properties\Settings.Designer.cs
     文件         249  2019-04-28 09:22  GdiCoordinateSystem\GdiCoordinateSystem\Properties\Settings.settings
     目录           0  2019-04-28 09:23  GdiCoordinateSystem\GdiCoordinateSystem\bin\
     目录           0  2019-04-28 11:21  GdiCoordinateSystem\GdiCoordinateSystem\bin\Debug\
     文件       15360  2019-04-29 09:36  GdiCoordinateSystem\GdiCoordinateSystem\bin\Debug\GdiCoordinateSystem.exe
     文件       34304  2019-04-29 09:36  GdiCoordinateSystem\GdiCoordinateSystem\bin\Debug\GdiCoordinateSystem.pdb
     文件       22688  2019-04-29 10:36  GdiCoordinateSystem\GdiCoordinateSystem\bin\Debug\GdiCoordinateSystem.vshost.exe
     目录           0  2019-10-21 15:54  GdiCoordinateSystem\GdiCoordinateSystem\bin\Release\
     目录           0  2019-04-28 09:22  GdiCoordinateSystem\GdiCoordinateSystem\obj\
     目录           0  2019-04-28 11:16  GdiCoordinateSystem\GdiCoordinateSystem\obj\Debug\
     文件         864  2019-04-28 09:22  GdiCoordinateSystem\GdiCoordinateSystem\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6969  2019-04-28 09:23  GdiCoordinateSystem\GdiCoordinateSystem\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件         180  2019-04-28 11:16  GdiCoordinateSystem\GdiCoordinateSystem\obj\Debug\GdiCoordinateSystem.MainForm.resources
     文件         180  2019-04-28 11:16  GdiCoordinateSystem\GdiCoordinateSystem\obj\Debug\GdiCoordinateSystem.Properties.Resources.resources
     文件        1013  2019-04-29 10:36  GdiCoordinateSystem\GdiCoordinateSystem\obj\Debug\GdiCoordinateSystem.csproj.FileListAbsolute.txt
     文件        1015  2019-04-28 11:16  GdiCoordinateSystem\GdiCoordinateSystem\obj\Debug\GdiCoordinateSystem.csproj.GenerateResource.Cache
............此处省略6个文件信息