OpenGL implementation of the painting line, circle algorithm, code can be successfully run.

DrawLine-Circle
...............\Debug
...............\.....\DrawCircle.exe
...............\.....\DrawCircle.ilk
...............\.....\DrawCircle.pdb
...............\.....\DrawLine.exe
...............\.....\DrawLine.ilk
...............\.....\DrawLine.pdb
...............\DrawLine
...............\DrawLine.sdf
...............\DrawLine.sln
...............\DrawLine.v12.suo
...............\........\Debug
...............\........\.....\DrawLine.log
...............\........\.....\DrawLine.obj
...............\........\.....\DrawLine.tlog
...............\........\.....\.............\CL.read.1.tlog
...............\........\.....\.............\CL.write.1.tlog
...............\........\.....\.............\DrawLine.lastbuildstate
...............\........\.....\.............\link.read.1.tlog
...............\........\.....\.............\link.write.1.tlog
...............\........\.....\stdafx.obj
...............\........\.....\vc120.idb
...............\........\.....\vc120.pdb
...............\........\DrawLine.cpp
...............\........\DrawLine.vcxproj
...............\........\DrawLine.vcxproj.filters
...............\........\ReadMe.txt
...............\........\stdafx.cpp
...............\........\stdafx.h
...............\........\targetver.h

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