right graphics partially magnified, in the mouse movement on graphics display graphics enlarge the different parts, click the button to reduce magnification, click the right to increase magnification

如何对图形进行局部放大
......................\MainFrm.cpp
......................\MainFrm.h
......................\ReadMe.txt
......................\res

......................\...\Thumbs.db


......................\...\ZoomPart.rc2

......................\resource.h
......................\StdAfx.cpp
......................\StdAfx.h
......................\ZoomPart.aps
......................\ZoomPart.clw
......................\ZoomPart.cpp
......................\ZoomPart.dsp
......................\ZoomPart.dsw
......................\ZoomPart.h
......................\ZoomPart.ncb
......................\ZoomPart.opt
......................\ZoomPart.plg
......................\ZoomPart.rc
......................\ZoomPartDoc.cpp
......................\ZoomPartDoc.h
......................\ZoomPartView.cpp
......................\ZoomPartView.h

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