import java.awt.Color;
import java.awt.Component;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.GLProfile;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.BoxLayout;

public class Main
{
        static CanvasListener listener = new CanvasListener();

        public static void main(String[] args)
        {
                GLProfile.initSingleton(false);

                GLProfile profile = GLProfile.getMaxFixedFunc();
                GLCapabilities caps = new GLCapabilities(profile);
                GLCanvas canvas = new GLCanvas(caps);
                canvas.setBackground(Color.yellow);
                canvas.addGLEventListener(listener);

                final Frame topLevelFrame = new Frame();
                topLevelFrame.addWindowListener(new WindowAdapter() {
                     public void windowClosing(WindowEvent e) {
                        System.err.println("closing");
                        topLevelFrame.dispose();
                     }
                     public void windowClosed(WindowEvent e) {
                        System.err.println("closed");
                     }
                });
                topLevelFrame.setLayout(new BoxLayout(topLevelFrame, BoxLayout.Y_AXIS));

                topLevelFrame.add(canvas);

                // Revalidate size/layout.
                // Always validate if component added/removed.
                // Ensure 1st paint of GLCanvas will have a valid size, hence drawable gets created.
                topLevelFrame.setSize(400, 300);
                topLevelFrame.validate();

                topLevelFrame.setVisible(true);

                // Animator animator = new Animator(canvas);
                // animator.start();

                // canvas.display();
        }
}

class CanvasListener implements GLEventListener
{
        @Override
        public void display(GLAutoDrawable arg0)
        {
                GL2 gl = arg0.getGL().getGL2();
                gl.glClearColor(1.0f, 0.0f, 0.0f, 0.5f);
                gl.glClear(GL.GL_COLOR_BUFFER_BIT);

                System.out.println("display");
        }

        @Override
        public void dispose(GLAutoDrawable arg0)
        {
        }

        @Override
        public void init(GLAutoDrawable arg0)
        {
                Component canvas = (Component) arg0;
                System.out.println(canvas.getSize().toString());
        }

        @Override
        public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3,
int arg4)
        {
        }
}