Rectangle qui se deplace(suite à un drag) en laissant des traces

Version imprimable

Slt à tous !

J'ai un petit code qui affiche une frame avec un rectangle !

Quand on deplace le rectabgle , celui-ci laisse des traces derriere lui !

Si quelqu'un peut m'aider !

Voici le code :

Code:

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import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Rectangle2D;
 
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
 
 
public class Rect extends JFrame {
  DrawingCanvas canvas;
  JLabel location;
 
  public Rect() {
    super();
    Container container = getContentPane();
    canvas = new DrawingCanvas();
    container.add(canvas);
    JPanel panel = new JPanel();
    panel.setLayout(new GridLayout(1, 2));
    panel.add(new JLabel("x,y: ", JLabel.RIGHT));
    location = new JLabel("");
    panel.add(location);
    container.add(panel, BorderLayout.SOUTH);
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    setSize(600,600);
    setVisible(true);
    }
 
    class DrawingCanvas extends JPanel {
    double x, y, w, h;
    int x1, y1, x2, y2;
    Rectangle2D rect;
    Cursor curCursor;
 
    public DrawingCanvas() {
      x = 20;
      y = 20;
      w = 100;
      h = 100;
      addMouseListener(new MyMouseListener());
      addMouseMotionListener(new MyMouseMotionListener());
    }
 
    public void paint(Graphics g) {
      Graphics2D g2D = (Graphics2D) g;
      setBackground(new Color(236, 233, 216));
      rect = new Rectangle2D.Double(x, y, w, h);
      g2D.draw(rect);
      if (curCursor != null)
        setCursor(curCursor);
    }
 
    class MyMouseListener extends MouseAdapter {
      public void mousePressed(MouseEvent e) {
        x1 = e.getX();
        y1 = e.getY();
        canvas.repaint();
      }
 
    }
 
    class MyMouseMotionListener extends MouseMotionAdapter {
      public void mouseDragged(MouseEvent e) {
        if (rect.contains(e.getX(), e.getY())) {
              x2 = e.getX();
              y2 = e.getY();
              x = x + x2 - x1;
              y = y + y2 - y1;
              x1 = x2;
              y1 = y2;
        }
        canvas.repaint();
      }
 
      public void mouseMoved(MouseEvent e) {
        if (rect != null) {
          if (rect.contains(e.getX(), e.getY())) {
            curCursor = Cursor
                .getPredefinedCursor(Cursor.HAND_CURSOR);
          } else {
            curCursor = Cursor.getDefaultCursor();
          }
        }
        canvas.repaint();
      }
    }
 
  }
}

20/09/2007, 17h53
vahid

Salut
Je n'ai pas regarder le code mais cela semble typique d'un non rafraichissement de la zone globale ou se trouve ton rectangle :
En effet, si tu repaint le rectangle, il va repaint ... le rectangle, et non la zone en arriere plan, donc il ne va pas effacer ses tracer :)
a+
20/09/2007, 20h06
hugobob

Merci beaucoup !

Je viens de faire un repaint du panel mais rien !

Merci de m'aider !
21/09/2007, 00h57
bouye

Cela semble normal puisque le fond du panel n'est jamais peint. Au lieu de surcharger public void paint(Graphics g) surcharge donc protected void paintComponent(Graphics g) et appelle super.paintComponent(g) au debut, de plus au lieu de :

Code:

setBackground(new Color(236, 233, 216));

Fait donc :

Code:

g.setColor(new Color(236, 233, 216));

Woaaouu !

Merci beaucoup !

Merci à tous !

ça fonctionne !

J'ai surcharger plutôt PaintComponent() au lieu de Paint()!

Voila le nouveau code :

Code:

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import java.awt.Container;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
 
public class Cadre extends JFrame {
  DrawingCanvas canvas;
  JLabel location;
 
  public Cadre() {
    super();
    Container container = getContentPane();
    canvas = new DrawingCanvas();
    container.add(canvas);
    JPanel panel = new JPanel();
    panel.setLayout(new GridLayout(1, 2));
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    setSize(600,600);
    setVisible(true);
  }
 
  class DrawingCanvas extends JPanel {
    double x, y, w, h;
    int x1, y1, x2, y2;
    Rectangle2D rec;
    Cursor curCursor;
    public DrawingCanvas() {
      x = 0;
      y = 0;
      w = 140;
      h = 140;
      addMouseListener(new MyMouseListener());
      addMouseMotionListener(new MyMouseMotionListener());
    }
    public void paintComponent(Graphics g) {
      super.paintComponent(g);
      Graphics2D g2D = (Graphics2D) g;
      rec = new Rectangle2D.Double(x, y, w, h);
      g2D.draw(rec);
      if (curCursor != null)
        setCursor(curCursor);
    }
 
    class MyMouseListener extends MouseAdapter {
      public void mousePressed(MouseEvent e) {
        canvas.repaint();
        x1 = e.getX();
        y1 = e.getY();
      }
 
    }
    class MyMouseMotionListener extends MouseMotionAdapter {
      public void mouseDragged(MouseEvent e) {
        if (rec.contains(e.getX(), e.getY())) {
            x2 = e.getX();
            y2 = e.getY();
            x = x + x2 - x1;
            y = y + y2 - y1;
            x1 = x2;
            y1 = y2;
        }
        canvas.repaint();
      }
 
      public void mouseMoved(MouseEvent e) {
        if (rec != null) {
          if (rec.contains(e.getX(), e.getY())) {
            curCursor = Cursor
                .getPredefinedCursor(Cursor.HAND_CURSOR);
          } else {
            curCursor = Cursor.getDefaultCursor();
          }
        }
        canvas.repaint();
      }
    }
  }
}