C# 显示图片并且可以缩放和描绘矩形

使用winform窗体模式，显示图片在picbox控件中。可以滑动实现图片缩放。在图片上可以绘制多个矩形。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PicturePointTest
{
   public class DrawPic
    {

    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-03-20 17:08  PicturePointTest\
     目录           0  2018-03-09 10:15  PicturePointTest\bin\
     目录           0  2018-03-20 17:10  PicturePointTest\bin\Debug\
     文件       16384  2018-03-20 17:10  PicturePointTest\bin\Debug\PicturePointTest.exe
     文件       28160  2018-03-20 17:10  PicturePointTest\bin\Debug\PicturePointTest.pdb
     文件       22688  2018-03-20 17:08  PicturePointTest\bin\Debug\PicturePointTest.vshost.exe
     文件         490  2015-10-22 09:54  PicturePointTest\bin\Debug\PicturePointTest.vshost.exe.manifest
     文件         170  2018-03-09 11:24  PicturePointTest\DrawPic.cs
     文件        4750  2018-03-09 11:33  PicturePointTest\Form1.cs
     文件        5202  2018-03-09 10:52  PicturePointTest\Form1.Designer.cs
     文件        5817  2018-03-09 10:52  PicturePointTest\Form1.resx
     文件        3307  2018-03-20 17:08  PicturePointTest\frmMain.cs
     文件        6613  2018-03-20 16:32  PicturePointTest\frmMain.Designer.cs
     文件        5817  2018-03-20 16:32  PicturePointTest\frmMain.resx
     目录           0  2018-03-09 10:15  PicturePointTest\obj\
     目录           0  2018-03-20 17:10  PicturePointTest\obj\Debug\
     文件        6848  2018-03-20 15:16  PicturePointTest\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件         647  2018-03-20 17:10  PicturePointTest\obj\Debug\PicturePointTest.csproj.FileListAbsolute.txt
     文件        1072  2018-03-20 17:10  PicturePointTest\obj\Debug\PicturePointTest.csproj.GenerateResource.Cache
     文件       16384  2018-03-20 17:10  PicturePointTest\obj\Debug\PicturePointTest.exe
     文件         180  2018-03-20 17:10  PicturePointTest\obj\Debug\PicturePointTest.Form1.resources
     文件         180  2018-03-20 17:10  PicturePointTest\obj\Debug\PicturePointTest.frmMain.resources
     文件       28160  2018-03-20 17:10  PicturePointTest\obj\Debug\PicturePointTest.pdb
     文件         180  2018-03-20 17:10  PicturePointTest\obj\Debug\PicturePointTest.Properties.Resources.resources
     目录           0  2018-03-09 10:15  PicturePointTest\obj\Debug\TempPE\
     文件        4098  2018-03-20 15:25  PicturePointTest\PicturePointTest.csproj
     文件         499  2018-03-20 15:16  PicturePointTest\Program.cs
     目录           0  2018-03-09 10:15  PicturePointTest\Properties\
     文件        1358  2018-03-09 10:15  PicturePointTest\Properties\AssemblyInfo.cs
     文件        2845  2018-03-09 10:15  PicturePointTest\Properties\Resources.Designer.cs
     文件        5612  2018-03-09 10:15  PicturePointTest\Properties\Resources.resx
............此处省略2个文件信息