animation using swings

[Anandh Ramesh]

hi,

i need to develop an animation that shows a box moving from one location to another. how do i go about it?

[Michael Dunn]

here's a couple of ways

1) Thread

    
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Testing extends JFrame
{
  int x=0, y=0;
  int counter = 0;
  public Testing()
  {
    final JPanel p = new JPanel(){
      public void paintComponent(Graphics g){
        super.paintComponent(g);
        g.setColor(Color.BLUE);
        g.fillRect(x,y,50,50);
      }
    };
    getContentPane().add(p);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(800,600);
    setLocationRelativeTo(null);
    setVisible(true);
    Thread t = new Thread(){
      public void run(){
        while(true)
        {
          x += 5;
          y += 5;
          counter++;
          if(counter > 100) break;
          try{Thread.sleep(25);}catch(InterruptedException ie){}
          SwingUtilities.invokeLater(new Runnable(){
            public void run(){
              p.repaint();
            }
          });
        }
      }
    };
    t.start();
  }
  public static void main(String[] args){new Testing();}
}

2) Timer

 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Testing extends JFrame
{
  int x=0, y=0;
  javax.swing.Timer timer;
  int counter = 0;
  public Testing()
  {
    final JPanel p = new JPanel(){
      public void paintComponent(Graphics g){
        super.paintComponent(g);
        g.setColor(Color.BLUE);
        g.fillRect(x,y,50,50);
      }
    };
    getContentPane().add(p);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(800,600);
    setLocationRelativeTo(null);
    setVisible(true);
    ActionListener al = new ActionListener(){
      public void actionPerformed(ActionEvent e){
        x += 5;
        y += 5;
        p.repaint();
        counter++;
        if(counter > 100) timer.stop();
      }
    };
    timer = new javax.swing.Timer(25,al);
    timer.start();
  }
  public static void main(String[] args){new Testing();}
}