import javax.media.opengl.*;
import java.awt.Frame;

public class Basic implements GLEventListener {
	public void display(GLAutoDrawable drawable) {
      GL gl = drawable.getGL();
      gl.glBegin(GL.GL_POLYGON); // draw a square
          gl.glVertex2f(-0.5f, -0.5f);
          gl.glVertex2f(-0.5f, 0.5f);
          gl.glVertex2f(0.5f, 0.5f);
          gl.glVertex2f(0.5f, -0.5f);
      gl.glEnd();
    }
	 public static void main(String[ ] args) {
	    Frame frame = new Frame("Basic"); // create the frame
	    frame.setSize(500, 500); // give it a size
	    GLCanvas canvas = new GLCanvas(); // create the canvas
	    Basic basic = new Basic(); // create the listener
	    canvas.addGLEventListener(basic); // add listener to canvas
	    frame.add(canvas);//add canvas to window
	    frame.setVisible(true); // show window
	  }
	public void displayChanged(GLAutoDrawable arg0, boolean arg1, boolean arg2) {
		// TODO Auto-generated method stub

	}
	public void init(GLAutoDrawable arg0) {
		// TODO Auto-generated method stub

	}
	public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4) {
		// TODO Auto-generated method stub

	}
}