you can draw lines by moving your mouse.

Huatuban\Debug\Huatuban.exe
........\.....\Huatuban.ilk
........\.....\Huatuban.pdb
........\Huatuban\ClassDiagram1.cd
........\........\CStraight.h
........\........\Debug\BuildLog.htm
........\........\.....\Huatuban.exe.embed.manifest
........\........\.....\Huatuban.exe.embed.manifest.res
........\........\.....\Huatuban.exe.intermediate.manifest
........\........\.....\Huatuban.obj
........\........\.....\Huatuban.pch
........\........\.....\Huatuban.res
........\........\.....\HuatubanDoc.obj
........\........\.....\HuatubanView.obj
........\........\.....\MainFrm.obj
........\........\.....\mt.dep
........\........\.....\stdafx.obj
........\........\.....\vc90.idb
........\........\.....\vc90.pdb
........\........\Huatuban.aps
........\........\Huatuban.cpp
........\........\Huatuban.h
........\........\Huatuban.rc
........\........\Huatuban.vcproj
........\........\Huatuban.vcproj.CHINA-D5635C3E7.Administrator.user
........\........\HuatubanDoc.cpp
........\........\HuatubanDoc.h
........\........\HuatubanView.cpp
........\........\HuatubanView.h
........\........\MainFrm.cpp
........\........\MainFrm.h
........\........\ReadMe.txt
........\........\res\Huatuban.ico
........\........\...\Huatuban.rc2
........\........\...\HuatubanDoc.ico
........\........\...\Toolbar.bmp
........\........\resource.h
........\........\stdafx.cpp
........\........\stdafx.h
........\........\targetver.h
........\Huatuban.ncb
........\Huatuban.sln
........\Huatuban.suo
........\........\Debug
........\........\res
........\Debug
........\Huatuban
Huatuban

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