C#读取并显示DXF文件含缩放、拖放

C#读取并显示DXF文件，并实现缩放，拖放操作

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;

namespace DXFReader
{
    /// 

    /// App.xaml 的交互逻辑
    /// 

    public partial class App : Application
    {
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件         320  2013-01-15 09:15  DXFReader\App.xaml
     文件         305  2013-01-15 09:15  DXFReader\App.xaml.cs
     文件      332995  2013-01-15 09:15  DXFReader\bin\Debug\10.dxf
     文件           0  2013-03-11 16:23  DXFReader\bin\Debug\10.dxf.txt
     文件      215768  2013-01-15 09:15  DXFReader\bin\Debug\11.dxf
     文件      217937  2013-01-15 09:15  DXFReader\bin\Debug\12.dxf
     文件      221242  2013-01-15 09:15  DXFReader\bin\Debug\13.bak
     文件      221552  2013-01-15 09:15  DXFReader\bin\Debug\13.dxf
     文件      552394  2013-01-15 09:15  DXFReader\bin\Debug\14.dxf
     文件     1884535  2013-01-15 09:15  DXFReader\bin\Debug\15.dxf
     文件      490317  2013-01-15 09:15  DXFReader\bin\Debug\16.dxf
     文件      212477  2013-01-15 09:15  DXFReader\bin\Debug\21.dxf
     文件      212710  2013-01-15 09:15  DXFReader\bin\Debug\22.dxf
     文件      212595  2013-01-15 09:15  DXFReader\bin\Debug\23.dxf
     文件      214974  2013-01-15 09:15  DXFReader\bin\Debug\30.dxf
     文件      327077  2013-01-15 09:15  DXFReader\bin\Debug\7.dxf
     文件      211596  2013-01-15 09:15  DXFReader\bin\Debug\9.dxf
     文件      213823  2013-01-15 09:15  DXFReader\bin\Debug\arc.dxf
     文件      213768  2013-01-15 09:15  DXFReader\bin\Debug\circle.dxf
     文件      213997  2013-01-15 09:15  DXFReader\bin\Debug\circlewithTXT.dxf
     文件       23040  2018-01-02 08:42  DXFReader\bin\Debug\DXFReader.exe
     文件       77312  2018-01-02 08:42  DXFReader\bin\Debug\DXFReader.pdb
     文件       24224  2018-01-09 09:03  DXFReader\bin\Debug\DXFReader.vshost.exe
     文件         490  2010-03-17 22:39  DXFReader\bin\Debug\DXFReader.vshost.exe.manifest
     文件      215882  2013-01-15 09:15  DXFReader\bin\Debug\multiply.dxf
     文件      179712  2018-01-02 08:42  DXFReader\bin\Debug\netDxf.dll
     文件      609792  2018-01-02 08:42  DXFReader\bin\Debug\netDxf.pdb
     文件        8662  2013-01-15 09:15  DXFReader\bin\Debug\RGB.txt
     文件       80384  2018-01-01 20:38  DXFReader\bin\Debug\ZoomableCanvas.dll
     文件      232960  2018-01-01 20:38  DXFReader\bin\Debug\ZoomableCanvas.pdb
     目录           0  2013-03-12 09:50  DXFReader\bin\Release\
............此处省略132个文件信息