OpenGL draw the circle

CircleInClass
.............\.idea
.............\.....\.name
.............\.....\compiler.xml
.............\.....\copyright
.............\.....\.........\profiles_settings.xml
.............\.....\encodings.xml
.............\.....\misc.xml
.............\.....\modules.xml
.............\.....\workspace.xml
.............\CircleInClass.iml
.............\out
.............\...\production
.............\...\..........\CircleInClass
.............\...\..........\.............\Circles$1.class
.............\...\..........\.............\Circles.class
.............\...\..........\.............\JOGLFrame$1.class
.............\...\..........\.............\JOGLFrame.class
.............\...\..........\.............\META-INF
.............\...\..........\.............\........\MANIFEST.MF
.............\...\..........\.............\shaders
.............\...\..........\.............\.......\default.frag
.............\...\..........\.............\.......\default.vert
.............\...\..........\.............\util
.............\...\..........\.............\....\IVertexData.class
.............\...\..........\.............\....\Light.class
.............\...\..........\.............\....\Material.class
.............\...\..........\.............\....\ObjectInstance.class
.............\...\..........\.............\....\ObjExporter.class
.............\...\..........\.............\....\ObjImporter.class
.............\...\..........\.............\....\PolygonMesh.class
.............\...\..........\.............\....\ShaderLocationsVault.class
.............\...\..........\.............\....\ShaderProgram$ShaderInfo.class
.............\...\..........\.............\....\ShaderProgram.class
.............\...\..........\.............\....\TextureImage.class
.............\...\..........\.............\....\VertexProducer.class
.............\...\..........\.............\VertexAttrib.class
.............\...\..........\.............\VertexAttribProducer.class
.............\...\..........\.............\View.class
.............\src
.............\...\Circles.java
.............\...\JOGLFrame.java
.............\...\META-INF
.............\...\........\MANIFEST.MF
.............\...\shaders
.............\...\.......\default.frag
.............\...\.......\default.vert
.............\...\VertexAttrib.java
.............\...\VertexAttribProducer.java
.............\...\View.java

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