Lavagna elettronica del corso

Contenuto della lavagna elettronica

Venerdi' 12 Ottobre 2001 : 13 37 2 - zito da labmul4.fisica.uniba.it 193.204.188.61

oogetti: ChartTool applet
NumericSet sequenza di numeri
BarChart estende Canvas - grafico
TextField - finestrella dei numeri
GaphIt - tasto
un file contiene un'unica classe public

public,private,protected,(niente)
possibilita' di accesso

double vett[];
vett = new double[10]

metodi in C++ : member functions

while(s_.length() > ++idxSpace && !Character.isDigit(s_.charAt(idxSpace))

Venerdi' 12 Ottobre 2001 : 14 8 3 - zito da labmul4.fisica.uniba.it 193.204.188.61

while(condizione) { }

AND &&
OR ||
NOT !
==

BorderLayout - serve a disporre degli oggetti grafici in una finestra
North
East Center West
South

setLayout - metodo di applet che permette di definire un
oggetto di posizionamento
add - aggiunge un oggetto grafico

oggetto Color
Color c = new Color(.4,.3,.2);
Color.white;
Math.PI;

Java 2

Lunedi' 15 Ottobre 2001 : 13 59 1 - Anonimo da 193.204.188.61


import java.awt.*;
import java.applet.Applet;

public class Layout extends Applet{
  Button bottone1,bottone2,bottone3,b1,b2,b3;
  Panel p;
  
  public void init(){
    bottone1=new Button("nord");
    bottone2=new Button("sud");
    bottone3=new Button("est");
    p=new Panel();
    p.setLayout(new GridLayout(3,1));
    p.add(new Button("b1"));
    p.add(new Button("b2"));
    p.add(new Button("b3"));
    setLayout(new BorderLayout());
    add(bottone1,BorderLayout.NORTH);
    add(bottone2,BorderLayout.SOUTH);
    add(bottone3,BorderLayout.EAST);
    add(p,BorderLayout.CENTER);
   }

Lunedi' 15 Ottobre 2001 : 14 45 4 - Anonimo da 193.204.188.61

import java.awt.Graphics;
import java.awt.Image;
import java.applet.Applet;

public class Immagine extends Applet{

Image img;

 public void init(){
 
 img  =  getImage( getCodeBase(), "infn1.gif" );

}

 public void paint(Graphics g){

   g.drawImage(img, 100,100,80,80, this);

  }
}

Martedi' 16 Ottobre 2001 : 10 35 5 - Anonimo da 193.204.188.74

No comment

Martedi' 16 Ottobre 2001 : 10 50 5 - Anonimo da 193.204.188.74

No comment

Martedi' 16 Ottobre 2001 : 14 39 1 - Anonimo da labmul2.fisica.uniba.it 193.204.188.59

import java.awt.*;
import java.applet.Applet;
import java.awt.Graphics;

import java.awt.Image;

public class Immagine2 extends Applet{
Button b1,b2,b3;
Scrollbar sc;
Image img,img2;
Panel p;

public void init(){

img = getImage( getCodeBase(), "ace.jpg" );
img2 = getImage( getCodeBase(), "ace.gif" );
sc= new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,300);
b1 = new Button("fiesta");
b2 = new Button("la scienzassai");
b3 = new Button("ahio");
p = new Panel();
p.setLayout(new GridLayout());
p.add(b1);
p.add(b2);
p.add(b3);
setLayout(new BorderLayout());
//add(sc);
add("North",p);

}

public void paint(Graphics g){
g.drawImage(img, 300,100,180,180, this);
g.drawImage(img2, 80,100,80,80, this);
}
}

Martedi' 16 Ottobre 2001 : 15 11 - Anonimo da labmul4.fisica.uniba.it 193.204.188.61

import java.awt.*;
import java.awt.Graphics;
import java.awt.Image;
import java.applet.Applet;
import java.awt.event.*;
public class Immagine extends Applet implements ActionListener{
Button b1,b2,b3;
Scrollbar sc;
Image img,img2;
Panel p;
boolean im1,im2;

 public void init(){
im1=true; 
im2=false;
 img  =  getImage( getCodeBase(), "infn1.gif" );
 img2  =  getImage( getCodeBase(), "max.gif" );

 sc = new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,300);
 b1 = new Button("Immagine1");
 b2 = new Button("Immagine2");
 b3 = new Button("Immagine3");
b1.addActionListener(this);
b2.addActionListener(this);
 p = new Panel();
 p.setLayout(new GridLayout());
 p.add(b1);
 p.add(b2);
 p.add(b3);
 setLayout(new BorderLayout());
 //add(sc);
 add("North",p);
 }
public void actionPerformed(ActionEvent evt){
if(evt.getSource()==b1){
System.out.println("b1");
im1=true;
im2=false;
}
if(evt.getSource()==b2){
System.out.println("b2");

im1=false;
im2=true;
}
}

 public void paint(Graphics g){

  if(im1)g.drawImage(img, 100,100,80,80, this);
  if(im2)g.drawImage(img2, 150,150,80,80, this);
  }
}

Martedi' 16 Ottobre 2001 : 15 16 2 - Anonimo da labmul4.fisica.uniba.it 193.204.188.61

import java.awt.*;
import java.awt.Graphics;
import java.awt.Image;
import java.applet.Applet;
import java.awt.event.*;
public class Immagine extends Applet implements ActionListener{
Button b1,b2,b3;
Scrollbar sc;
Image img,img2;
Panel p;
boolean im1,im2;

 public void init(){
im1=true; 
im2=false;
 img  =  getImage( getCodeBase(), "infn1.gif" );
 img2  =  getImage( getCodeBase(), "max.gif" );

 sc = new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,300);
 b1 = new Button("Immagine1");
 b2 = new Button("Immagine2");
 b3 = new Button("Immagine3");
b1.addActionListener(this);
b2.addActionListener(this);
 p = new Panel();
 p.setLayout(new GridLayout());
 p.add(b1);
 p.add(b2);
 p.add(b3);
 setLayout(new BorderLayout());
 //add(sc);
 add("North",p);
 }
public void actionPerformed(ActionEvent evt){
if(evt.getSource()==b1){
System.out.println("b1");
im1=true;
im2=false;
}
if(evt.getSource()==b2){
System.out.println("b2");
setBackground(Color.red);
im1=false;
im2=true;
}
repaint();
}

 public void paint(Graphics g){

  if(im1)g.drawImage(img, 100,100,80,80, this);
  if(im2)g.drawImage(img2, 150,150,80,80, this);
  }
}

Martedi' 16 Ottobre 2001 : 15 31 1 - Anonimo da labmul2.fisica.uniba.it 193.204.188.59

import java.awt.*;
import java.applet.Applet;
import java.awt.Graphics;

import java.awt.Image;
import java.awt.event.*;

public class Immagine2 extends Applet implements ActionListener{
Button b1,b2,b3;
Scrollbar sc;
Image img,img2,img3;
Panel p;
boolean im1,im2,im3;

public void init(){

im1=false;
im2=false;
im3=false;
img = getImage( getCodeBase(), "ace.jpg" );
img2 = getImage( getCodeBase(), "ace.gif" );
img3 = getImage( getCodeBase(), "img3.gif" );
sc= new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,300);
b1 = new Button("fiesta");
b2 = new Button("la scienzassai");
b3 = new Button("ahio");
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);

p = new Panel();
p.setLayout(new GridLayout());
p.add(b1);
p.add(b2);
p.add(b3);
setLayout(new BorderLayout());
//add(sc);
add("North",p);
}

public void actionPerformed (ActionEvent evt){

if(evt.getSource()==b1){

im1=true; im2=false; im3=false;
}

if(evt.getSource()==b2){

im2=true;im1=false; im3=false;
}
if(evt.getSource()==b3){

im3=true;im1=false; im2=false;
}
repaint();
}
public void paint(Graphics g){
if(im1==true)g.drawImage(img,300,100,180,180, this);
if(im2==true)g.drawImage(img2, 50,100,80,80, this);
if(im3==true)g.drawImage(img3, 180,100,80,80, this);
}
}

Martedi' 16 Ottobre 2001 : 15 44 2 - zito da labmul4.fisica.uniba.it 193.204.188.61

Interface - classe particolare
descrizione con solo metodi vuoti
Ogni classe estend un'unica classe normale e puo'
implementare un numero qualsiasi di interfacce

Mercoledi' 17 Ottobre 2001 : 13 36 4 - zito da labmul4.fisica.uniba.it 193.204.188.61

Thread - oggetto che serve per definire un programma da
eseguire in parallelo
run - metodo dove e' definito il programma in parallelo
this - indica l'oggetto nel quale ci troviamo
super - lo'oggetto genitore
this()- costruttore dell'oggetto nel quale ci troviamo
super() - costruttore dell'oggetto genitore

Mercoledi' 17 Ottobre 2001 : 14 21 2 - Anonimo da labmul6.fisica.uniba.it 193.204.188.63

import java.awt.*;
import java.applet.Applet;
import java.awt.Graphics;

import java.awt.Image;
import java.awt.event.*;

public class Immagine2 extends Applet implements ActionListener,Runnable{
Thread animazione;
Button b1,b2,b3,b4;
Scrollbar sc;
Image img,img2,img3;
Panel p;
boolean im1,im2,im3,im4;
int x,y,r;

public void init(){

r = 100;
im1=false;
im2=false;
im3=false;
im4=true;
img = getImage( getCodeBase(), "fufis.jpg" );
img2 = getImage( getCodeBase(), "RIGHT1.gif" );
img3 = getImage( getCodeBase(), "MARE.gif" );
sc= new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,300);
b1 = new Button("gatto1");
b2 = new Button("gatto2");
b3 = new Button("mare");
b4 = new Button("animazione");
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);

p = new Panel();
p.setLayout(new GridLayout());
p.add(b1);
p.add(b2);
p.add(b3);
p.add(b4);
p.add(sc);
setLayout(new BorderLayout());
add("North",p);
}
public void start() { if (animazione == null) { animazione = new Thread(this);
animazione.start(); } } public void stop() { if (animazione != null) { animazione = null; } }
public void run() { while(animazione != null) {
for (x = r; x <= size().width ; x=x+1) { repaint();
try { Thread.sleep(100);} catch (InterruptedException e) { } } } }

public void actionPerformed (ActionEvent evt){

if(evt.getSource()==b1){

im1=true; im2=false; im3=false; im4=false;

}

if(evt.getSource()==b2){
im2=true; im1=false; im3=false; im4=false;

}
if(evt.getSource()==b3){

im3=true; im1=false; im2=false; im4=false;

}
if(evt.getSource()==b4){

im3=false;im1=false; im2=false; im4=true;
}
repaint();
}
public void paint(Graphics g){
if(im1==true)g.drawImage(img,0,100, this);
if(im2==true)g.drawImage(img2,0,100, this);
if(im3==true)g.drawImage(img3, 0,100,this);
if(im4)g.drawImage(img3, 0,100,this);
g.drawImage(img2, x,200,this);

}
}

Mercoledi' 17 Ottobre 2001 : 14 26 1 - zito da labmul4.fisica.uniba.it 193.204.188.61


import java.awt.*;
     import java.applet.Applet;
     import java.awt.Graphics;

     import java.awt.Image;
     import java.awt.event.*;


     public class Immagine2 extends Applet implements ActionListener,
       Runnable{
     Thread animazione; 
             Button b1,b2,b3,b4;
     Scrollbar sc;
     Image img,img2,img3;
     Panel p;
     boolean im1,im2,im3,im4;
     int x,y,r;
     public void init(){ 
      r = 100;
     im1=false;
     im2=false;
     im3=false;
     im4=true;
     img = getImage( getCodeBase(), "fufis.jpg" );
     img2 = getImage( getCodeBase(), "RIGHT1.gif" );
     img3 = getImage( getCodeBase(), "MARE.gif" );
     sc= new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,300);
     b1 = new Button("gatto1");
     b2 = new Button("gatto2");
     b3 = new Button("mare");
     b4 = new Button("animazione");

     
     b1.addActionListener(this);
     b2.addActionListener(this);
     b3.addActionListener(this);
     b4.addActionListener(this);


     p = new Panel();
     p.setLayout(new GridLayout());
     p.add(b1);
     p.add(b2);
     p.add(b3);
     p.add(b4);
     p.add(sc);
     setLayout(new BorderLayout());
     add("North",p);
     } 
     public void start() { if (animazione == null) { animazione = new Thread(this);
          animazione.start(); } } 
         public void stop() { if (animazione != null) { animazione = null; } } 
      public void run() { while(animazione != null) {
      for (x = r; x <= size().width ; x=x+1) { repaint();
      try { Thread.sleep(100);} catch (InterruptedException e) { } } } } 

     public void actionPerformed (ActionEvent evt){
     if(evt.getSource()==b1){

     im1=true; im2=false; im3=false;im4=false;
     }

     if(evt.getSource()==b2){
     im2=true;im1=false; im3=false;im4=false;
     }
     if(evt.getSource()==b3){

     im3=true;im1=false; im2=false;im4=false;
     }
    if(evt.getSource()==b4){

     im3=false;im1=false; im2=false;im4=true;
     }

     repaint();
     }
     public void paint(Graphics g){
     if(im1==true)g.drawImage(img,0,100, this);
     if(im2==true)g.drawImage(img2,0,100, this);
     if(im3==true)g.drawImage(img3, 0,100,this);
     if(im4){g.drawImage(img3, 0,100,this);
       g.drawImage(img2, x,200,this);

      }
     }
     }

Mercoledi' 17 Ottobre 2001 : 14 36 1 - zito da labmul4.fisica.uniba.it 193.204.188.61


import java.awt.*;
     import java.applet.Applet;
     import java.awt.Graphics;

     import java.awt.Image;
     import java.awt.event.*;


     public class Immagine2 extends Applet implements ActionListener,
       Runnable{
     Image o;
              Graphics og; 

     Thread animazione; 
             Button b1,b2,b3,b4;
     Scrollbar sc;
     Image img,img2,img3;
     Panel p;
     boolean im1,im2,im3,im4;
     int x,y,r;
     public void init(){ 
      o = createImage(size().width,size().height);
                 og = o.getGraphics(); 

      r = 100;
     im1=false;
     im2=false;
     im3=false;
     im4=true;
     img = getImage( getCodeBase(), "fufis.jpg" );
     img2 = getImage( getCodeBase(), "RIGHT1.gif" );
     img3 = getImage( getCodeBase(), "MARE.gif" );
     sc= new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,300);
     b1 = new Button("gatto1");
     b2 = new Button("gatto2");
     b3 = new Button("mare");
     b4 = new Button("animazione");

     
     b1.addActionListener(this);
     b2.addActionListener(this);
     b3.addActionListener(this);
     b4.addActionListener(this);


     p = new Panel();
     p.setLayout(new GridLayout());
     p.add(b1);
     p.add(b2);
     p.add(b3);
     p.add(b4);
     p.add(sc);
     setLayout(new BorderLayout());
     add("North",p);
     } 
     public void start() { if (animazione == null) { animazione = new Thread(this);
          animazione.start(); } } 
         public void stop() { if (animazione != null) { animazione = null; } } 
      public void run() { while(animazione != null) {
      for (x = r; x <= size().width ; x=x+1) { repaint();
      try { Thread.sleep(100);} catch (InterruptedException e) { } } } } 

     public void actionPerformed (ActionEvent evt){
     if(evt.getSource()==b1){

     im1=true; im2=false; im3=false;im4=false;
     }

     if(evt.getSource()==b2){
     im2=true;im1=false; im3=false;im4=false;
     }
     if(evt.getSource()==b3){

     im3=true;im1=false; im2=false;im4=false;
     }
    if(evt.getSource()==b4){

     im3=false;im1=false; im2=false;im4=true;
     }

     repaint();
     }
public void update(Graphics g) { paint(g); } 

     public void paint(Graphics g){
     if(im1==true)og.drawImage(img,0,100, this);
     if(im2==true)og.drawImage(img2,0,100, this);
     if(im3==true)og.drawImage(img3, 0,100,this);
     if(im4){
      og.setColor(Color.white);
                 og.fillRect(0,0,size().width,size().height); 

      og.drawImage(img3, 0,100,this);
       og.drawImage(img2, x,200,this);

      }
      g.drawImage(o, 0, 0 ,this); 

     }
     }

Mercoledi' 17 Ottobre 2001 : 15 20 3 - zito da labmul10.fisica.uniba.it 193.204.188.67


import java.awt.*;
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.image.*;
import java.awt.event.*;

public class Immagine2 extends Applet implements ActionListener, Runnable {
Thread animazione;
Image o; 
Graphics og; 
InverseColorFilter filter;
Image negative;

Button b1,b2,b3,b4,b5;
Scrollbar sc;
Image img,img2,img3;
Panel p;
boolean im1,im2,im3,im4,im5;
int x,y,r;

public void init(){ 
     o = createImage(size().width,size().height); 
     og = o.getGraphics();
     filter = new InverseColorFilter ();

     r = 100;
     im1=false;
     im2=false;
     im3=false;
     im4=true;
     im5=false;
     img = getImage( getCodeBase(), "fufis.jpg" );
     
     filter = new InverseColorFilter ();
     negative = createImage (new FilteredImageSource (img.getSource          (), filter)); 

     img2 = getImage( getCodeBase(), "RIGHT1.gif" );
     img3 = getImage( getCodeBase(), "MARE.gif" );

     sc= new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,300);
     b1 = new Button("gatto1");
     b2 = new Button("gatto2");
     b3 = new Button("mare");
     b4 = new Button("animazione");
     b5 = new Button("nuovo colore");
     b1.addActionListener(this);
     b2.addActionListener(this);
     b3.addActionListener(this);
     b4.addActionListener(this);
     b5.addActionListener(this);
     
     p = new Panel();
     p.setLayout(new GridLayout());
     p.add(b1);
     p.add(b2);
     p.add(b3);
     p.add(b4);
     p.add(b5);
     p.add(sc);
     setLayout(new BorderLayout());
     add("North",p);
     } 
     public void start() {
     if(im4==true)
     if(animazione == null) { 
     animazione = new Thread(this); 
     animazione.start(); 
     } 
     } 
     public void stop() { 
     if(animazione != null) { 
     animazione = null; 
     } 
     } 
     public void run() { 
     while(animazione != null) { 
     for (x = r; x <= size().width ; x=x+1) { 
     repaint(); 
     try { Thread.sleep(100);} 
     catch (InterruptedException e) { } } } } 


     public void actionPerformed (ActionEvent evt){

     if(evt.getSource()==b1){
     im1=true; 
     im2=false; 
     im3=false; 
     im4=false;
     im5=false;
     stop();

     }

     if(evt.getSource()==b2){
     im2=true; 
     im1=false; 
     im3=false; 
     im4=false;
     im5=false;
     stop();

     }
     
     if(evt.getSource()==b3){
     im3=true; 
     im1=false; 
     im2=false; 
     im4=false;
     im5=false;
     stop();
     }
     
     if(evt.getSource()==b4){
     im3=true; 
     im1=false; 
     im2=false; 
     im4=true;
     im5=false;
     start();
     }

     if(evt.getSource()==b5){
     im5=true; 
     im1=false; 
     im2=false; 
     im3=false;
     im4=false;
     start();
     }


     repaint();
     }
     public void paint(Graphics g){
     og.setColor(Color.white); 
     og.fillRect(0,0,size().width,size().height); 
     if(im1==true)og.drawImage(img,0,100, this);
     if(im2==true)og.drawImage(img2,0,100, this);
     if(im3==true)og.drawImage(img3, 0,100,this);
     if(im4==true){
        
        
og.drawImage(img3, 0,100,this);    
    og.drawImage(img2, x,200,this);

     }
     if(im5==true)og.drawImage(negative,0,100, this);
     g.drawImage(o, 0, 0 ,this);

     }
     public void update(Graphics g) { paint(g); } 

     }
      
     class InverseColorFilter extends RGBImageFilter
     {
        public InverseColorFilter () {
        canFilterIndexColorModel = true; }

        public int filterRGB (int x, int y, int rgb) {
        int red   = (rgb & 0xff0000) >>16;
        int green = (rgb &   0xff00) >>  8;
        int blue  =  rgb &     0xff;
         
        red = 255-red; green = 255-green; blue = 255 - blue;
         
        return (0xff000000 | (red << 16) | (green <<  8) |  blue); } 
     }