Discussion :

[yashiro]

Bonjour à tous,
Je suis en phase de finalisation d'une application java (Eclipse 3.2 + J2SE 1.5) de gestion de ressource. Dans cette application, j'affiche un emploi de temps sous forme de JTable relooké et j'y matérialise les tâches par des rectangle transparents au-dessus des cellules du JTable.¨Pour cela, je redéfinit la méthode paintComponent(Graphics g) du JTable et j'utilise à l'interieur un graphics2D pour la transparence

Code :

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public void paintComponent(Graphics g){
		super.paintComponents(g);
 
		int width = getWidth();
		int height = getHeight();
		Graphics2D g2d = (Graphics2D)g; // Ligne d'erreur
 
		Paint old = g2d.getPaint(); // Sauvegarde de l'anien mode de peinture
 
		// Création du gradient de peinture
		GradientPaint gp = new GradientPaint(0, 0, color, width, height, color.brighter().brighter());
		g2d.setPaint(gp);
		g2d.fillRect(0, 0, width, height);
 
		if(_ishour){
			g2d.setPaint(ShinColor.getDefaultOrange());
			g2d.setStroke(new BasicStroke(2));
			g2d.drawLine(0, 1, width, 1);
			g2d.drawLine(0, 0, 0, height);
		}
		else if(_isquart){
			g2d.setPaint(ShinColor.getDefaultOrange());
			g2d.setStroke(new BasicStroke(2));
			g2d.drawLine(0, height/2, width, height/2);
			g2d.drawLine(0, 0, 0, height);
		}
		else if(_ishalph){
			g2d.setPaint(ShinColor.getDefaultOrange());
			g2d.setStroke(new BasicStroke(2));
			g2d.drawLine(0, height, width, height);
			g2d.drawLine(0, 0, 0, height);
		}
		if(_hour != null){
			// Update des positions des composants
			_hour.setBounds(new Rectangle(0, 0, this.getWidth(), 4 * this.getHeight()/5));
		}
		// Restauration de l'ancien mode de peinture
		g2d.setPaint(old);
	}

Le problème maintenant est que je voudrais imprimer cet JTable avec le code

Code :

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Properties props = new Properties();
 
    props.put("awt.print.paperSize", "a4");
    props.put("awt.print.destination", "printer");
 
 
    PrintJob pJob = getToolkit().getPrintJob(this,
			  "Printing_Test", props);
    if (pJob != null)
      {
        Graphics pg = pJob.getGraphics();
        MonJTable.printAll(pg) 
        pg.dispose();
        pJob.end();
      }

et j'ai une exception

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java.lang.ClassCastException: sun.print.ProxyPrintGraphics
	at clientInterfacePackage.shinGoodies.ShinJTableHour.paintComponent(ShinJTableHour.java:75)
	at javax.swing.JComponent.printComponent(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.CellRendererPane.paintComponent(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
	at javax.swing.plaf.ComponentUI.update(Unknown Source)
	at javax.swing.JComponent.paintComponent(Unknown Source)
	at clientInterfacePackage.shinGoodies.ShinJTable.paintComponent(ShinJTable.java:302)
	at javax.swing.JComponent.printComponent(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.printChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JViewport.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.printChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.printChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.printChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.printChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.printChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.printChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JLayeredPane.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.printChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.print(Unknown Source)
	at java.awt.GraphicsCallback$PrintCallback.run(Unknown Source)
	at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
	at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
	at java.awt.Container.print(Unknown Source)
	at sun.awt.windows.WComponentPeer.print(Unknown Source)
	at sun.awt.windows.WCanvasPeer.print(Unknown Source)
	at sun.awt.windows.WPanelPeer.print(Unknown Source)
	at java.awt.GraphicsCallback$PeerPrintCallback.run(Unknown Source)
	at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
	at java.awt.Component.printAll(Unknown Source)
	at clientInterfacePackage.MainFrame.actionPerformed(MainFrame.java:660)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.AbstractButton.doClick(Unknown Source)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

qui se rapporte à la ligne dans laquelle je caste le graphics en graphics2D
Je ne sais pas quoi faire!

[xavlours]

Bonjour,

c'est un problème qui arrive de temps en temps : les drivers de certaines imprimantes font que la méthode paintComponent reçoit un Graphics et non un Graphics2D.

Dans ce cas, la meilleure chose à faire est de passer par une BufferedImage lorsque c'est nécessaire :

Code :

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public void paintComponent(Graphics g) {
 
  BufferedImage img = null;
  Graphics2D g2;
 
  if(g instanceof Graphics2D) {
    g2 = (Graphics2D) g;
  } else {
    img = new BufferedImage(this.getWidth(), this.getHeight(),
                BufferedImage.TYPE_INT_RGB);
    g2 = img.createGraphics();
  }
 
  // on dessine le composant en utilisant g2
  // de manière classique
 
  super.paintComponent(g2);
  ...
 
 
  if(g != g2) // si on a utilisé l'image
    g.drawImage(img, 0, 0, null);
}