Translate a Circle by pressing Swing Class JButton in #JOGL

This program translates the circle on pressing the translate button.

Here is the source:(online Viewing)


import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


import com.jogamp.opengl.GL2;
import com.jogamp.opengl.GLAutoDrawable;
import com.jogamp.opengl.GLCapabilities;
import com.jogamp.opengl.GLEventListener;
import com.jogamp.opengl.GLProfile;

import com.jogamp.opengl.glu.GLU;
import com.jogamp.opengl.awt.GLJPanel;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

class CircleTranslate extends GLJPanel implements GLEventListener,ActionListener {

/**
 * Interface to the GLU library.
 */
private GLU glu;
int x,y;
static JButton okButton;
/**
 * Take care of initialization here.
 */


CircleTranslate()
{
// super(g);
super( new GLCapabilities(null) ); // Makes a panel with default OpenGL "capabilities".
GLJPanel drawable = new GLJPanel();               // new GLJPanel inside GLJPanel
drawable.setPreferredSize(new Dimension(200,100));
setLayout(new BorderLayout());
add(drawable, BorderLayout.CENTER);
drawable.addGLEventListener(this); // Set up events for OpenGL drawing!
// drawable.addMouseListener(this);
//drawable.addMouseMotionListener(this);
//drawable.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {
// System.exit(0);
x++;
repaint();
}
public void init(GLAutoDrawable gld) {
    GL2 gl = gld.getGL().getGL2();
    glu = new GLU();

    gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
//    gl.glViewport(-250, -150, 250, 150);
    gl.glMatrixMode(GL2.GL_PROJECTION);
    gl.glLoadIdentity();
    glu.gluOrtho2D(-250.0, 250.0, -150.0, 150.0);
    gl.glMatrixMode(GL2.GL_MODELVIEW);
    x=10;y=30;
    repaint();
}

/**
 * Take care of drawing here.
 */
public void display(GLAutoDrawable drawable) {
    GL2 gl = drawable.getGL().getGL2();
    gl.glClear(GL2.GL_COLOR_BUFFER_BIT);
    /*
     * put your code here
     */
   
    drawCircle(gl, x, y, 50);
}

public void reshape(GLAutoDrawable drawable, int x, int y, int width,
        int height) {
}


private void drawCircle(GL2 gl, int x1, int y1, int r) {
    gl.glPointSize(1.0f);
    gl.glBegin(GL2.GL_POINTS);
   
    int x=0,y=r,p=1-r;
    while(x<y)
    {
   
    if(p<0)
    p+=2*x+3;
    else {
    p+=2*(x-y)+5;
    y--;
    }
    x++;
    circleSymmetry(gl,x1,y1,x,y);

    }
    gl.glEnd();//end drawing of points

}
public void dispose(GLAutoDrawable arg0)
{
}
public void circleSymmetry(GL2 gl,int xc,int yc,int x,int y)
{
gl.glVertex2i(xc+x , yc+y );
gl.glVertex2i(xc-x , yc+y );
gl.glVertex2i(xc+x , yc-y );
gl.glVertex2i(xc-x , yc-y );
gl.glVertex2i(xc+y , yc+x );
gl.glVertex2i(xc+y , yc-x );
gl.glVertex2i(xc-y , yc+x );
gl.glVertex2i(xc-y , yc-x );
}
public static void main(String args[])
{
JFrame window = new JFrame("Circle Translate");
    // The canvas
    CircleTranslate panel = new CircleTranslate();
    panel.setPreferredSize(new Dimension(1000,1000));      
    okButton = new JButton("Translate");
    JPanel content = new JPanel();

content.setLayout(new BorderLayout());
content.add(panel, BorderLayout.CENTER);
content.add(okButton, BorderLayout.SOUTH);
    okButton.addActionListener(panel);
   
    window.setContentPane(content);
    window.pack();
    window.setLocation(0,0);
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setVisible(true);
    panel.requestFocusInWindow();
}
}

Thanks!!!