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From: Elliot on 21 Feb 2010 22:45
> If you are already drawing it to print, just draw it on a JComponent of
> some variety.  I do that all the time for print preview only in reverse..

Are you saying to extend JComponent in my print() method?


From: Knute Johnson on 21 Feb 2010 23:10
On 2/21/2010 7:45 PM, Elliot wrote:
>> If you are already drawing it to print, just draw it on a JComponent of
>> some variety. I do that all the time for print preview only in reverse.
>
> Are you saying to extend JComponent in my print() method?

No. What I'm saying is to use the code in your current print() method
to draw on a JComponent. In the example below, the method draw() is
used to draw on the JPanel as well as in the print() method to draw on
paper. Needless to say, I have left out printing margins and PageFormat
and all of that.

import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import javax.swing.*;

public class test4 extends JPanel implements Printable {
public test4() {
setPreferredSize(new Dimension(400,300));
}

public void paintComponent(Graphics g) {
draw(g);
}

public void draw(Graphics g) {
g.drawRect(20,20,360,260);
g.drawLine(20,20,380,280);
g.drawLine(20,280,380,20);
}

public int print(Graphics g, PageFormat pf, int index) {
if (index == 0) {
draw(g);
return Printable.PAGE_EXISTS;
} else
return Printable.NO_SUCH_PAGE;
}

public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final test4 t4 = new test4();
f.add(t4,BorderLayout.CENTER);
JButton b = new JButton("Print");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
PrinterJob pj = PrinterJob.getPrinterJob();
pj.setPrintable(t4);
if (pj.printDialog())
try {
pj.print();
} catch (PrinterException pe) {
System.out.println(pe);
}
}
});
f.add(b,BorderLayout.SOUTH);
f.pack();
f.setVisible(true);
}
});
}
}

--

Knute Johnson
email s/nospam/knute2010/

From: Knute Johnson on 21 Feb 2010 23:23
On 2/21/2010 8:10 PM, Knute Johnson wrote:
> On 2/21/2010 7:45 PM, Elliot wrote:
>>> If you are already drawing it to print, just draw it on a JComponent of
>>> some variety. I do that all the time for print preview only in reverse.
>>
>> Are you saying to extend JComponent in my print() method?
>
> No. What I'm saying is to use the code in your current print() method to
> draw on a JComponent. In the example below, the method draw() is used to
> draw on the JPanel as well as in the print() method to draw on paper.
> Needless to say, I have left out printing margins and PageFormat and all
> of that.
>
> import java.awt.*;
> import java.awt.event.*;
> import java.awt.print.*;
> import javax.swing.*;
>
> public class test4 extends JPanel implements Printable {
> public test4() {
> setPreferredSize(new Dimension(400,300));
> }
>
> public void paintComponent(Graphics g) {
> draw(g);
> }
>
> public void draw(Graphics g) {
> g.drawRect(20,20,360,260);
> g.drawLine(20,20,380,280);
> g.drawLine(20,280,380,20);
> }
>
> public int print(Graphics g, PageFormat pf, int index) {
> if (index == 0) {
> draw(g);
> return Printable.PAGE_EXISTS;
> } else
> return Printable.NO_SUCH_PAGE;
> }
>
> public static void main(String[] args) {
> EventQueue.invokeLater(new Runnable() {
> public void run() {
> JFrame f = new JFrame();
> f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
> final test4 t4 = new test4();
> f.add(t4,BorderLayout.CENTER);
> JButton b = new JButton("Print");
> b.addActionListener(new ActionListener() {
> public void actionPerformed(ActionEvent ae) {
> PrinterJob pj = PrinterJob.getPrinterJob();
> pj.setPrintable(t4);
> if (pj.printDialog())
> try {
> pj.print();
> } catch (PrinterException pe) {
> System.out.println(pe);
> }
> }
> });
> f.add(b,BorderLayout.SOUTH);
> f.pack();
> f.setVisible(true);
> }
> });
> }
> }
>

One job I did a while back we printed on 8.5 x 14 paper. I scaled the
print preview so that it would fit easily on the screen but would print
full size. There are lots of tricky things you can do but only write
the code once or most of it anyway.

--

Knute Johnson
email s/nospam/knute2010/

From: Elliot on 22 Feb 2010 18:14
Thanks Knute for the very clear example.

Executing draw()from either print()or paintComponent() is the kind of
idea I was hoping to find in the forum. In my case there are will be
three calls to draw(). The first by a direct print to a default
printer and the next two as you have described, in the preview and the
preview's print action.

Thanks again.

Elliot
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