Problem with print methods
Hi all,
I've developped a class in order to print a 3D shape on a printer. But after printer selection in print dialog box, Java returns a NullPointerException.
Can you help me to find problem with my code ?
The code is below :
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.print.*;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;
import java.awt.geom.AffineTransform;
publicclass Impression_Image3Dimplements Printable, ImageObserver
{
BufferedImage bImage;
staticfinallong serialVersionUID = 1;
private OffScreenCanvas3D offScreenCanvas =null;
public Impression_Image3D()
{
print();
}
publicint print(Graphics g, PageFormat pf,int pageIndex)throws PrinterException
{
if (pageIndex>=1)
return Printable.NO_SUCH_PAGE;
Graphics g2D = (Graphics2D)g;
g2D.translate((int)pf.getImageableX(), (int)pf.getImageableY());
AffineTransform t2d =new AffineTransform();
t2d.translate(pf.getImageableX(), pf.getImageableY());
double xscale = pf.getImageableWidth() / (double)bImage.getWidth();
double yscale = pf.getImageableHeight() / (double)bImage.getHeight();
double scale = Math.min(xscale, yscale);
t2d.scale(scale, scale);
Dimension dim =new Dimension(256,256);
BufferedImage image = offScreenCanvas.getOffScreenImage(dim);
try
{
//Image finale qui va 阾re imprim閑
g2D.drawImage(image, 0, 0,null);
//g2D.drawImage(bImage,t2d, this);
}
catch (Exception ex){
ex.printStackTrace();
return Printable.NO_SUCH_PAGE;
}
return Printable.PAGE_EXISTS;
}
void print()
{
PrinterJob printJob = PrinterJob.getPrinterJob();
PageFormat pageFormat = printJob.defaultPage();
pageFormat.setOrientation(PageFormat.LANDSCAPE);
pageFormat = printJob.validatePage(pageFormat);
printJob.setPrintable(this, pageFormat);
if (printJob.printDialog())
{
try
{
printJob.print();
}
catch (PrinterException ex)
{
ex.printStackTrace();
}
}
}
publicboolean imageUpdate(Image img,int infoflags,int x,int y,int width,int height)
{
returnfalse;
}
}
[4685 byte] By [
David38a] at [2007-10-3 7:50:51]
Oh un Fran鏰is ;-)
Thank you for your reply. In fact, I find a solution. So, in order to help some developpers, I give you class code.
It's the following:
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.print.*;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;
import java.awt.geom.AffineTransform;
import java.awt.KeyboardFocusManager;
public class Impression_Image3D implements Printable, ImageObserver
{
BufferedImage bImage;
static final long serialVersionUID = 1;
private OffScreenCanvas3D offScreenCanvas = null;
public Impression_Image3D()
{
//Etape 1
System.out.println(KeyboardFocusManager.getCurrentKeyboardFocusManager().getActiveWindow()); //-->Permet d'afficher la JFrame active
print();
}
public int print(Graphics g, PageFormat pf, int pageIndex) throws PrinterException
{
//Etape 4
Graphics g2D = (Graphics2D)g;
if (pageIndex>=1)
return Printable.NO_SUCH_PAGE;
//Dimension en pixels de l'image ?imprimer
//Dimension dim = new Dimension(Dessin3D.Dessin3D_ext.canvas3D.getHeight(),Dessin3D.Dessin3D_ext.canvas3D.getWidth());
Dimension dim = new Dimension(500,500);
offScreenCanvas = Dessin3D.Dessin3D_ext.offScreenCanvas;
//On r閏up鑢e l'image (pixmap) rendue par le canvas3D offscreen
bImage = offScreenCanvas.getOffScreenImage(dim);
g2D.drawImage(bImage, 0, 0, null); //image --> bImage
g2D.translate((int)pf.getImageableX(), (int)pf.getImageableY());
AffineTransform t2d = new AffineTransform();
t2d.translate(pf.getImageableX(), pf.getImageableY());
double xscale = pf.getImageableWidth() / (double)bImage.getWidth();
double yscale = pf.getImageableHeight() / (double)bImage.getHeight();
double scale = Math.min(xscale, yscale);
t2d.scale(scale, scale);
return Printable.PAGE_EXISTS;
}
void print()
{
//Etape 2
PrinterJob printJob = PrinterJob.getPrinterJob();
PageFormat pageFormat = printJob.defaultPage();
pageFormat.setOrientation(PageFormat.LANDSCAPE);
pageFormat = printJob.validatePage(pageFormat);
printJob.setPrintable(this, pageFormat);
if (printJob.printDialog())
{
try
{
System.out.println("Impression 閠ape 3");
printJob.print();
}
catch (PrinterException ex)
{
ex.printStackTrace();
}
}
}
public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height)
{
return false;
}
}
