OpenGL do with a two-dimensional clock, move the pointer can follow the system time

openGL practice3
................\Debug
................\.....\openGL practice3.exe
................\.....\openGL practice3.ilk
................\.....\openGL practice3.pdb
................\ipch
................\....\opengl practice3-263c2d80
................\....\.........................\opengl practice3-6b169b6f.ipch
................\openGL practice3
................\openGL practice3.opensdf
................\openGL practice3.sln
................\openGL practice3.suo
................\................\Debug
................\................\openGL practice3.cpp
................\................\openGL practice3.vcxproj
................\................\openGL practice3.vcxproj.filters
................\................\openGL practice3.vcxproj.user
................\................\ReadMe.txt
................\................\stdafx.cpp
................\................\stdafx.h
................\................\targetver.h

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