Continuo dell'esercizio di Martedì 13/01/2009

Aggiungendo al Programma già svolto:

g.fillRect(clickx,clicky,10,10)

si avrà segnalato con un puntino dove è stato cliccato il mouse:

Esercizio svolto in classe Martedì 13/01/2009

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class TestaMouseInput {
private JFrame f=new JFrame ("Testa input mouse");
private Pannello p=new Pannello();
private Point sPoint=new Point ();
private Point ePoint=new Point ();
public TracciaLinea(){
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(500,500);
f.add(p);
f.addMouseListener(new Linea());
f.addMouseMotionListener(new Linea1());
f.setVisible(true);
}
public class Pannello extends JPanel{
public void paintComponent(Graphics g){
g.drawLine(sPoint.x,sPoint.y,ePoint.x,ePoint.y);
}
}
public static void main(String[] args){
TracciaLinea t=new TracciaLinea();
}
public class Linea implements MouseListener{
public void mousePressed(MouseEvent e){
sPoint.x=e.getX()-9;
sPoint.y=e.getY()-34;
}
public void mouseReleased(MouseEvent e){
ePoint.x=e.getX()-9;
ePoint.y=e.getY()-34;
f.repaint();
}
public void mouseClicked(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
}
public class Linea1 implements MouseMotionListener{
public void mouseDragged(MouseEvent e){
ePoint.x=e.getX()-9;
ePoint.y=e.getY()-34;
f.repaint();
}
public void mouseMoved(MouseEvent e){}
}
}


Al clic del mouse il programma darà le cordinate del punto cliccato.

Esercizio svolto in classe venerdì 10/01/2009
import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class TracciaLinea {

private JFrame f=new JFrame ("tracciamento linee rette");

private Pannello p=new Pannello();

private Point sPoint=new Point ();

private Point ePoint=new Point ();

public TracciaLinea(){

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setSize(500,500);

f.add(p);

f.addMouseListener(new Linea());

f.addMouseMotionListener(new Linea1());

f.setVisible(true);

}

public class Pannello extends JPanel{

public void paintComponent(Graphics g){

g.drawLine(sPoint.x,sPoint.y,ePoint.x,ePoint.y);

}

}

public static void main(String[] args){

TracciaLinea t=new TracciaLinea();

}

public class Linea implements MouseListener{

public void mousePressed(MouseEvent e){

sPoint.x=e.getX()-9;

sPoint.y=e.getY()-34;

}

public void mouseReleased(MouseEvent e){

ePoint.x=e.getX()-9;

ePoint.y=e.getY()-34;

f.repaint();

}

public void mouseClicked(MouseEvent e){}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

}

public class Linea1 implements MouseMotionListener{

public void mouseDragged(MouseEvent e){

ePoint.x=e.getX()-9;

ePoint.y=e.getY()-34;

f.repaint();

}

public void mouseMoved(MouseEvent e){}

}

}