Good zoom view, examples of very good, please suggest, a lot of improvement

放大缩小视图\放大缩小视图\Debug\Viewport.ilk
............\............\UpgradeLog.XML
............\............\Viewport\ChildFrm.cpp
............\............\........\ChildFrm.h
............\............\........\Debug\BuildLog.htm
............\............\........\MainFrm.cpp
............\............\........\MainFrm.h
............\............\........\MyDialogBar.cpp
............\............\........\MyDialogBar.h
............\............\........\ReadMe.txt
............\............\........\res\Toolbar.bmp
............\............\........\...\Viewport.ico
............\............\........\...\Viewport.rc2
............\............\........\...\ViewportDoc.ico
............\............\........\Resource.h
............\............\........\stdafx.cpp
............\............\........\stdafx.h
............\............\........\Viewport.aps
............\............\........\Viewport.cpp
............\............\........\Viewport.h
............\............\........\Viewport.rc
............\............\........\Viewport.vcproj
............\............\........\Viewport.vcproj.8.00.old
............\............\........\Viewport.vcproj.TB507-15.Administrator.user
............\............\........\Viewport.vcproj.TB507-19.Administrator.user
............\............\........\Viewport.vcproj.TXGC502-B38.Administrator.user
............\............\........\ViewportDoc.cpp
............\............\........\ViewportDoc.h
............\............\........\ViewportView.cpp
............\............\........\ViewportView.h
............\............\Viewport.ncb
............\............\Viewport.sln
............\............\Viewport.sln.old
............\............\Viewport.suo
............\............\_UpgradeReport_Files\UpgradeReport.css
............\............\....................\UpgradeReport.xslt
............\............\....................\UpgradeReport_Minus.gif
............\............\....................\UpgradeReport_Plus.gif
............\............\Viewport\Debug
............\............\........\res
............\............\Debug
............\............\Viewport
............\............\_UpgradeReport_Files
............\放大缩小视图
放大缩小视图

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