Mouse.java

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class Retta extends JPanel implements MouseListener{
private int x1;
private int Y1;
private int x2;
private int y2;
private int conta=0;
public void mouseClicked(MouseEvent e){
int x=e.getX();
int y=e.getY();
conta++;
if(conta==1){
x1=x;
y1=y;
}
if(conta==2){
x2=x;
y2=y;
conta=0;
repaint();
}
}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mousePressed(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
public void paintComponent(Graphics g){
g.drawLine(x1,y1,x2,y2);
}
}