Animazione #3

Con il double buffering si elimina lo sfarfallio

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.Timer;

public class Animazione_2 extends    Applet
                          implements ActionListener
{
    final int ms=100;
    Timer     t;
    final int nFrame=12;
    int       frame;
    Image     iFrame[];
    final int dx=200;
    final int dy=200;
    Graphics  gOFF;
    Image     iOFF;

    public void init()
    {
       iOFF=createImage(dx, dy);
       gOFF=iOFF.getGraphics();
       iFrame=new Image[nFrame];
       for(int i=0; i < nFrame; i++)
          iFrame[i]=getImage(getCodeBase(), "PT_anim"+i+".gif");
       frame=0;
       t=new Timer(ms, this);
       t.start();
    }
    public void paint(Graphics g)
    {
       gOFF.drawImage(iFrame[frame], 0, 0, this);
       g.drawImage(iOFF, 0, 0, this);
    }
    public void actionPerformed(ActionEvent e)
    {
       frame++;
       if(frame==nFrame)
          frame=0;
       repaint();
    }
    public void update(Graphics g)
    {
       paint(g);
    }
}

Osserva

1. Image, Graphics, createImage(), getGraphics()

2. update(), paint()