VC of BMP bitmap images rotating sample source code, can be clockwise, counterclockwise rotation in two ways, but tests found that if the number of over-rotating case, if image distortion, Why?

............\图像旋转源代码
............\..............\Debug
............\..............\dibapi.cpp
............\..............\dibapi.h
............\..............\MainFrm.cpp
............\..............\MainFrm.h
............\..............\mydib.cpp
............\..............\mydib.h
............\..............\MyDIP.aps
............\..............\MyDIP.clw
............\..............\MyDIP.cpp
............\..............\MyDIP.dsp
............\..............\MyDIP.dsw
............\..............\MyDIP.h
............\..............\MyDIP.ncb
............\..............\MyDIP.opt
............\..............\MyDIP.plg
............\..............\MyDIP.rc
............\..............\MyDIPDoc.cpp
............\..............\MyDIPDoc.h
............\..............\MyDIPView.cpp
............\..............\MyDIPView.h
............\..............\ReadMe.txt
............\..............\Release
............\..............\res

............\..............\...\MyDIP.rc2


............\..............\Resource.h
............\..............\StdAfx.cpp
............\..............\StdAfx.h

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