JPanel is bigger when printed than on screen

Hi, I am trying to do print a JPanel (send it to printer). I am having 2 issues,
1. JPanel become bigger than the size on screen. I have noticed it when I put
backgroud color on the said JPanel. Do I have to convert integer (width and height of JPanel) into Pixel?
2. Second issue is in printout the first page seems to have a margin, then second page follows the margin that I set in program.

Have read these tutorials:
Lesson: Printing (The Java™ Tutorials > 2D Graphics)
Chapter 6 Continued: Printing API

Here is a example app of what I am trying to do.

the JPanel I am trying to print

Code:

---

public class PnlPreview extends JPanel
{
    JButton btnPrint;
    public PnlPreview()
    {
        createUI();
    }

    private void createUI()
    {
        btnPrint = new JButton("PRINT");
        btnPrint.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                doPrint();
            }
        });
        setLayout(new GridLayout(10, 10));
        add(btnPrint);
    }

    private void doPrint()
    {
        PrinterJob printJob = PrinterJob.getPrinterJob();
        printJob.setJobName("Printing Cheque..");
        printJob.setCopies(1);

        PrintPanel printFormat = new PrintPanel(this);

        printJob.setPrintable(printFormat);
        if(printJob.printDialog())
        {
            try
            {
                printJob.print();
            }
            catch (Exception ex)
            {
                ex.printStackTrace();
            }
        }
    }

    @Override
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D)g;

        Font aFont = new Font("Serif", Font.BOLD, 12);
        g2d.setFont(aFont);
        g2d.drawString("October 5, 2011", 100, 100);
        g2d.drawString("mine0926", 100, 200);
        g2d.drawString("TRIAL", 100, 300);
    }
}

---

Class that implements Printable

Code:

---

public class PrintPanel implements Printable
{
    private JPanel panelToPrint;
    public PrintPanel(JPanel panelToPrint)
    {
        this.panelToPrint = panelToPrint;
    }


    public int print(Graphics g, PageFormat pf, int PageIndex)
    {
        if(PageIndex > 1)
        {
            return NO_SUCH_PAGE;
        }

        Paper paper = new Paper();
        double margin = 0;

        paper.setImageableArea(margin, margin,
                paper.getImageableWidth(),
                paper.getImageableHeight());
        pf.setPaper(paper);


        //pf.setOrientation(PageFormat.PORTRAIT);
        Graphics2D g2d = (Graphics2D)g;
        g2d.translate(paper.getImageableX(), paper.getImageableY());
        panelToPrint.print(g);

        return PAGE_EXISTS;
    }
}

---

Thanks in advance.

Anyone who can point me in right direction?

Thanks..

Quote:

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Originally Posted by mine0926

Anyone who can point me in right direction?

Thanks..

---

Your screen has a certain dpi (pixels per inch) and your printer probably has another dpi number; you have to scale( ... ) your g2d according to that ratio.

kind regards,

Jos

How can I scale screen to printer's? do you have link? I actually experienced this in VB, so I try to search it on how to convert screen size to printer in java but I did not get any result that solve my problem, maybe I am using wrong keyword on search bar.

Thanks

Quote:

---

Originally Posted by mine0926

How can I scale screen to printer's? do you have link? I actually experienced this in VB, so I try to search it on how to convert screen size to printer in java but I did not get any result that solve my problem, maybe I am using wrong keyword on search bar.

Thanks

---

before you translate your image on the g2d printer Graphics2D, scale it: g2d.scale(r, r), where r is the ratio of the printer's dpi and the screen's dpi (I think the printer's dpi is 150, check your manuals).

kind regarrds,

Jos

Thanks, That solved my problem. But I just manually set printers DPI, is there a way I can get and set the printer's DPI ?
I have seen examples but it uses eclipse library, is there any API in java that I can use in handling Printers?

Thanks again.

Quote:

---

Originally Posted by mine0926

Thanks, That solved my problem. But I just manually set printers DPI, is there a way I can get and set the printer's DPI ?
I have seen examples but it uses eclipse library, is there any API in java that I can use in handling Printers?

Thanks again.

---

Don't trust me on this, but I think I've read in the API documentation somewhere that the dpi for a printer is always 150. Correct me if I'm wrong.

kind regards,

Jos