Cant get flickering out of animation

Question

Hello all,
please take a look at following Applet:
www.coskuns-castle.de/rotation
It is a rotating animation. It is realtime, means you can rotate the scene with your mouse. It is not bad at all, but I cant get the damn flickering out of the animation. Here is the full code (2 files) of the application version:
file RotatingPanel.java
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class RotatingPanel extends JPanel
private Graphics2D g2D;
private int freq;
private int startFreq;
private double theta;
private Point rotationCenter;
private Timer timer;
private boolean frozen;
public RotatingPanel()
this(false);
public RotatingPanel(boolean activateMouse)
this(5, Math.PI/25.0, activateMouse);
public RotatingPanel(int freq, double theta, boolean activateMouse)
super();
this.freq = freq;
startFreq = freq;
this.theta = theta;
UniversalListener uL = new UniversalListener();
timer = new Timer(freq, uL);
if (activateMouse)
{   this.addMouseMotionListener(uL);
this.addMouseListener(uL);
public void startRotation()
g2D = (Graphics2D) this.getGraphics();
rotationCenter = new Point(this.getWidth()/2, this.getHeight()/2);
timer.start();
private void rotate(double theta)
g2D.rotate(theta, rotationCenter.getX(), rotationCenter.getY());
paintComponent((Graphics)g2D);
private class UniversalListener extends MouseAdapter implements MouseMotionListener, ActionListener
private int x, altx;
boolean toleft = false;
public void mouseDragged(MouseEvent event)
if (x < event.getX())
rotate(theta);
else if (x > event.getX())
rotate(-theta);
altx = x;
x = event.getX();
public void mousePressed(MouseEvent event)
x = event.getX();
timer.stop();
public void mouseMoved(MouseEvent event)
public void mouseReleased(MouseEvent event)
timer.setDelay(freq = startFreq);
timer.start();
if (altx>event.getX() && !toleft)
{   theta=-theta;
toleft = true;
else if (altx>event.getX() && toleft)
{   theta=-theta;
toleft = false;
public void actionPerformed(ActionEvent event)
rotate(theta);
timer.setDelay(freq++);
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
file Rotation.java
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
import java.awt.*;
import javax.swing.*;
public class Rotation extends JFrame
public static void main(String[] args)
new Rotation();
public Rotation()
MyRotatingPanel rP = new MyRotatingPanel();
rP.setDoubleBuffered(true);
this.setContentPane(rP);
this.setBounds(200,50,500,500);
this.setTitle("2D Rotation by Fatih Coskun");
this.show();
rP.startRotation();
private class MyRotatingPanel extends RotatingPanel
private int x;
private int y;
private Font f;
public MyRotatingPanel()
super(true);
f = new Font("Serif", Font.PLAIN, 18);
this.setBackground(Color.black);
public void paintComponent(Graphics g)
x = ((int) this.getBounds().getWidth())/2;
y = ((int) this.getBounds().getHeight())/2;
g.setColor(Color.white);
g.setFont(f);
super.paintComponent(g);
g.drawString("Fatih", x-40, y-10);
g.drawString("Coskun", x-10, y+20);
g.drawRect(x-50,y-50,100,100);
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
I thank all, who took the time to look 10 seconds on my Applet. If you have any suggestions, please tell. I have already tried to draw first to an off screen image. But that will not solve the problem.
thx, Fatih

Answer 1

I done some more changes:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Rotation extends JFrame
public Rotation()
     addWindowListener(new WindowAdapter()
    {     public void windowClosing(WindowEvent ev)
               dispose();     
               System.exit(0);
     MyRotatingPanel rP = new MyRotatingPanel();
     setContentPane(rP);
     setBounds(200,50,500,500);
     setTitle("2D Rotation by Fatih Coskun");
     show();
     rP.startRotation();
private class MyRotatingPanel extends RotatingPanel
     private int    x;
     private int    y;
     private Font   f;
public MyRotatingPanel()
     super(true);
     f = new Font("Serif", Font.PLAIN, 18);
     setBackground(Color.black);
public void paintComponent(Graphics g)
     super.paintComponent(g);
     x = rotationCenter.x;
     y = rotationCenter.y;
     Graphics2D g2 = (Graphics2D)g;
     g2.rotate(ror,x-50+100/2,y-50+100/2);
     g2.setColor(Color.white);
     g2.setFont(f);
     g2.drawString("Fatih", x-40, y-10);
     g2.drawString("Coskun", x-10, y+20);
     g2.drawRect(x-50,y-50,100,100);
     g2.dispose();
public static void main (String[] args) 
     new Rotation();
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class RotatingPanel extends JPanel
     private Graphics2D g2D;
     private int     freq;
     private int     startFreq;
            double  theta;
               double  ror = 0;
               Point   rotationCenter;
     private Timer   timer;
     private boolean frozen;
public RotatingPanel()
     this(false);
public RotatingPanel(boolean activateMouse)
     this(5, Math.PI/25.0, activateMouse);
public RotatingPanel(int freq, double theta, boolean activateMouse)
     super();
     this.freq  = freq;
     startFreq  = freq;
     this.theta = theta;
     UniversalListener uL = new UniversalListener();
     timer = new Timer(freq, uL);
     if (activateMouse)
          this.addMouseMotionListener(uL);
          this.addMouseListener(uL);
public void startRotation()
     rotationCenter = new Point(this.getWidth()/2, this.getHeight()/2);
     timer.start();
private void rotate(double theta)
     ror = ror + theta;
     repaint(rotationCenter.x-80,rotationCenter.y-80,160,160);
private class UniversalListener extends MouseAdapter implements MouseMotionListener, ActionListener
     private int x, altx;
     boolean toleft = false;
public void mouseDragged(MouseEvent event)
     if (x < event.getX()) rotate(theta);
     if (x > event.getX()) rotate(-theta);
     altx = x;
     x = event.getX();
public void mousePressed(MouseEvent event)
     x = event.getX();
     timer.stop();
public void mouseMoved(MouseEvent event)
public void mouseReleased(MouseEvent event)
     timer.setDelay(freq = startFreq);
     if (altx > event.getX() && !toleft)
          theta  =-theta;
          toleft = true;
     else if (altx > event.getX() && toleft)
                theta  =-theta;
               toleft = false;
     rotationCenter = new Point(event.getX(),event.getY());
     repaint();     
     timer.start();
public void actionPerformed(ActionEvent event)
     rotate(theta);
     timer.setDelay(freq++);
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Rotation extends JFrame
public Rotation()
     addWindowListener(new WindowAdapter()
{     public void windowClosing(WindowEvent ev)
               dispose();
               System.exit(0);
     MyRotatingPanel rP = new MyRotatingPanel();
     setContentPane(rP);
     setBounds(200,50,500,500);
     setTitle("2D Rotation by Fatih Coskun");
     show();
     rP.startRotation();
private class MyRotatingPanel extends RotatingPanel
     private int x;
     private int y;
     private Font f;
public MyRotatingPanel()
     super(true);
     f = new Font("Serif", Font.PLAIN, 18);
     setBackground(Color.black);
public void paintComponent(Graphics g)
     super.paintComponent(g);
     x = rotationCenter.x;
     y = rotationCenter.y;
     Graphics2D g2 = (Graphics2D)g;
     g2.rotate(ror,x-50+100/2,y-50+100/2);
     g2.setColor(Color.white);
     g2.setFont(f);
     g2.drawString("Fatih", x-40, y-10);
     g2.drawString("Coskun", x-10, y+20);
     g2.drawRect(x-50,y-50,100,100);
     g2.dispose();
public static void main (String[] args)
     new Rotation();
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class RotatingPanel extends JPanel
     private Graphics2D g2D;
     private int freq;
     private int startFreq;
double theta;
               double ror = 0;
               Point rotationCenter;
     private Timer timer;
     private boolean frozen;
public RotatingPanel()
     this(false);
public RotatingPanel(boolean activateMouse)
     this(5, Math.PI/25.0, activateMouse);
public RotatingPanel(int freq, double theta, boolean activateMouse)
     super();
     this.freq = freq;
     startFreq = freq;
     this.theta = theta;
     UniversalListener uL = new UniversalListener();
     timer = new Timer(freq, uL);
     if (activateMouse)
          this.addMouseMotionListener(uL);
          this.addMouseListener(uL);
public void startRotation()
     rotationCenter = new Point(this.getWidth()/2, this.getHeight()/2);
     timer.start();
private void rotate(double theta)
     ror = ror + theta;
     repaint(rotationCenter.x-80,rotationCenter.y-80,160,160);
private class UniversalListener extends MouseAdapter implements MouseMotionListener, ActionListener
     private int x, altx;
     boolean toleft = false;
public void mouseDragged(MouseEvent event)
     if (x < event.getX()) rotate(theta);
     if (x > event.getX()) rotate(-theta);
     altx = x;
     x = event.getX();
public void mousePressed(MouseEvent event)
     x = event.getX();
     timer.stop();
public void mouseMoved(MouseEvent event)
public void mouseReleased(MouseEvent event)
     timer.setDelay(freq = startFreq);
     if (altx > event.getX() && !toleft)
          theta =-theta;
          toleft = true;
     else if (altx > event.getX() && toleft)
               theta =-theta;
               toleft = false;
     rotationCenter = new Point(event.getX(),event.getY());
     repaint();     
     timer.start();
public void actionPerformed(ActionEvent event)
     rotate(theta);
     timer.setDelay(freq++);