Programmation Java/Swing/Distance
Interfaces graphiques avec swing
[modifier | modifier le wikicode]Calculer la distance entre 2 points
[modifier | modifier le wikicode]Le fichier Distance.java
package org.wikibooks.fr.swing;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
/**
* Calcul de la distance entre 2 points.
* @author fr.wikibooks.org
*/
public class Distance extends JFrame implements ActionListener
{
private JLabel l_xa, l_ya, l_xb, l_yb, l_distance;
private JTextField t_xa, t_xb, t_ya, t_yb, t_distance;
private JButton b_edit_a, b_edit_b;
private Point
p_a = new Point(),
p_b = new Point();
public static void main(String[] args)
{
Distance app = new Distance();
app.setVisible(true);
}
public Distance()
{
setBounds(10, 10, 400, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container c = getContentPane();
c.setLayout(new BorderLayout());
JPanel p = new JPanel();
p.setLayout(null);
l_xa = new JLabel("Abscisse de A : ");
l_xa.setBounds(10, 20, 100, 20);
p.add(l_xa);
l_ya = new JLabel("Ordonnée de A : ");
l_ya.setBounds(10, 50, 100, 20);
p.add(l_ya);
l_xb = new JLabel("Abscisse de B : ");
l_xb.setBounds(10, 90, 100, 20);
p.add(l_xb);
l_yb = new JLabel("Ordonnée de B : ");
l_yb.setBounds(10, 120, 100, 20);
p.add(l_yb);
l_distance = new JLabel("La distance AB vaut : ");
l_distance.setBounds(10, 170, 150, 20);
p.add(l_distance);
t_xa = new JTextField(20);
t_xa.setBounds(120, 20, 100, 20);
t_xa.setEditable(false);
p.add(t_xa);
t_ya = new JTextField(20);
t_ya.setBounds(120, 50, 100, 20);
t_ya.setEditable(false);
p.add(t_ya);
t_xb = new JTextField(20);
t_xb.setBounds(120, 90, 100, 20);
t_xb.setEditable(false);
p.add(t_xb);
t_yb = new JTextField(10);
t_yb.setBounds(120, 120, 100, 20);
t_yb.setEditable(false);
p.add(t_yb);
t_distance = new JTextField(20);
t_distance.setBounds(150, 170, 150, 20);
t_distance.setEditable(false);
p.add(t_distance);
Border bord = BorderFactory.createRaisedBevelBorder();
b_edit_a = new JButton("MODIFIER A");
b_edit_a.setActionCommand("EDITA");
b_edit_a.addActionListener(this);
b_edit_a.setBorder(bord);
b_edit_a.setBounds(240, 35, 100, 20);
p.add(b_edit_a);
b_edit_b = new JButton("MODIFIER B");
b_edit_b.setActionCommand("EDITB");
b_edit_b.addActionListener(this);
b_edit_b.setBorder(bord);
b_edit_b.setBounds(240, 105, 100, 20);
p.add(b_edit_b);
c.add(p, BorderLayout.CENTER);
updateValues();
}
private void updateValues()
{
t_xa.setText(String.valueOf(p_a.getX()));
t_ya.setText(String.valueOf(p_a.getY()));
t_xb.setText(String.valueOf(p_b.getX()));
t_yb.setText(String.valueOf(p_b.getY()));
t_distance.setText(String.valueOf(p_a.distance(p_b)));
}
public void actionPerformed(ActionEvent e)
{
if (e.getActionCommand().equals("EDITA"))
{
PointDialog dialog = new PointDialog(this, "Modification du point A", p_a);
dialog.setVisible(true);
updateValues();
}
else if (e.getActionCommand().equals("EDITB"))
{
PointDialog dialog = new PointDialog(this, "Modification du point B", p_b);
dialog.setVisible(true);
updateValues();
}
}
}
Le fichier Point.java
package org.wikibooks.fr.swing;
/**
* Modélisation d'un point.
* @author fr.wikibooks.org
*/
public class Point
{
private double x, y;
public Point()
{
x = 0;
y = 0;
}
public double getX()
{
return x;
}
public double getY()
{
return y;
}
public void setXY(double x, double y)
{
this.x = x;
this.y = y;
}
public double distance(Point p)
{
double dx, dy;
dx = x - p.x;
dy = y - p.y;
return java.lang.Math.sqrt(dx * dx + dy * dy);
}
}
Le fichier PointDialog.java
package org.wikibooks.fr.swing;
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.event.*;
import java.awt.*;
/**
* Dialogue pour modifier un point.
* @author fr.wikibooks.org
*/
public class PointDialog extends JDialog
{
private Point p;
private JButton b_ok, b_cancel;
private JLabel l_x, l_y;
private JTextField t_x, t_y;
public PointDialog(JFrame f, String s, Point P)
{
super(f, s, true);
this.p = P;
setLocationRelativeTo(f);
setBounds(500, 100, 400, 200);
setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
Container c = getContentPane();
c.setLayout(null);
l_x = new JLabel("Abscisse du point :");
l_x.setBounds(10, 20, 120, 20);
c.add(l_x);
l_y = new JLabel("Ordonnée du point :");
l_y.setBounds(10, 50, 120, 20);
c.add(l_y);
t_x = new JTextField(20);
t_x.setBounds(140, 20, 100, 20);
c.add(t_x);
t_y = new JTextField(20);
t_y.setBounds(140, 50, 100, 20);
c.add(t_y);
Border bord = BorderFactory.createRaisedBevelBorder();
b_ok = new JButton("OK");
b_ok.setActionCommand("OK");
b_ok.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
closeOk();
}
});
b_ok.setBorder(bord);
b_ok.setBounds(260, 25, 60, 20);
c.add(b_ok);
b_cancel = new JButton("Annuler");
b_cancel.setActionCommand("CANCEL");
b_cancel.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
close();
}
});
b_cancel.setBorder(bord);
b_cancel.setBounds(260, 50, 60, 20);
c.add(b_cancel);
updatePoint();
}
private void updatePoint()
{
t_x.setText(String.valueOf(p.getX()));
t_y.setText(String.valueOf(p.getY()));
}
private void closeOk()
{
double x, y;
boolean ok = true;
try
{
x = Double.parseDouble(t_x.getText());
}
catch (NumberFormatException ex)
{
x = p.getX();
t_x.setText(String.valueOf(x));
ok = false;
}
try
{
y = Double.parseDouble(t_y.getText());
}
catch (NumberFormatException ex)
{
y = p.getY();
t_y.setText(String.valueOf(y));
ok = false;
}
if (ok)
{
p.setXY(x, y);
dispose();
}
}
private void close()
{
setVisible(false);
}
}