Draw a square, four vertices sinθ, cosθ to decide to change the value of θ to make graphics made by generating spin and rotate the left mouse button, right-click feature to stop free rotation

hw10\hw10\hw10.cpp
....\....\hw10.vcxproj
....\....\hw10.vcxproj.filters
....\....\hw10.vcxproj.user
....\....\ReadMe.txt
....\....\stdafx.cpp
....\....\stdafx.h
....\....\targetver.h
....\hw10.sdf
....\hw10.sln
....\hw10.suo
....\ipch\hw10-1cc64e13\hw10-dbf4146c.ipch
....\....\hw10-1cc64e13
....\hw10
....\ipch
hw10

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