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Printing in Threads

Posted on 1999-01-25
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I need the user to be able to manuever within a GUI while the user is printing (from Java).
Im trying to get Java2D printing to run in a separate thread.
Java 2D printing sometimes takes 2-3 minutes to run, thats alot of time for a user to be staring at the screen.
I have a print method (in the GUI class) that has this code
fragment:

try  {
     PrinterJob printerjob= PrinterJob.getPrinterJob();
     PageFormat pf= printerjob.defaultPage();
     printerjob.setPrintable(new PrintGraphPainter(linegraph.getImages()),pf);
     if (printerjob.printDialog())  {  
          printerjob.print();                    
     }
}
catch (PrinterException pe)  {
     System.out.println("Print Error");
     pe.printStackTrace();
}

Heres the PrintGraphPainter class:
//PrintGraphPainter.java
import java.awt.*;
import java.awt.print.*;

class PrintGraphPainter implements Printable   {

     Image[] images;

     public PrintGraphPainter(Image[] images)  {
          this.images=images;
     }
     public synchronized int print(Graphics g, PageFormat pf, int pageIndex) throws PrinterException  {

          if (pageIndex < 1)   {
               Dimension f= new Dimension((int)pf.getImageableWidth(),(int)pf.getImageableHeight());
               int XIMG=(int) (f.width-10);   int YIMG=(int)(XIMG * .5042);
               int XIMG2=(int)(f.width-10);   int YIMG2=(int)(XIMG2 * .1433);
               int XIMG3=(int)(f.width-10);   int YIMG3=(int)(XIMG3 * .07163);
               g.drawImage(images[0],(int)pf.getImageableX(),(int)pf.getImageableY(),XIMG3,YIMG3,null);
               g.drawImage(images[1],(int)pf.getImageableX(),(int)pf.getImageableY()+YIMG3,XIMG,YIMG,null);  
               g.drawImage(images[2],(int)pf.getImageableX(),(int)pf.getImageableY()+YIMG3+YIMG,XIMG2,YIMG2,null);
               g.drawRect((int)pf.getImageableX(),(int)pf.getImageableY(),XIMG,YIMG+YIMG2+YIMG3);  
               return Printable.PAGE_EXISTS;
          }
          else
               return Printable.NO_SUCH_PAGE;
     }
}

Do I make the PrintGraphPainter class implement the Runnable interface?

Im using JDK1.2 on Win95.
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Question by:mbunkows
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3 Comments
 
LVL 1

Expert Comment

by:malexiev
ID: 1234639
I'm not familiar with Java 2D but I think you should put your "slow" part of code in a thread
like this :

Thread t = new Thread () {
  public void run() {
     try  {
       PrinterJob printerjob= PrinterJob.getPrinterJob();
       PageFormat pf= printerjob.defaultPage();
       printerjob.setPrintable(new PrintGraphPainter(linegraph.getImages()),pf);
       if (printerjob.printDialog())  {  
           printerjob.print();                      
       }
    }
    catch (PrinterException pe)  {
      System.out.println("Print Error");
      pe.printStackTrace();
    }
  }
};

t.start();
0
 

Author Comment

by:mbunkows
ID: 1234640
Good thing I asked I thought this was actually going to take some work!
Post an answer and I'll give you an A
Thanks!
0
 
LVL 1

Accepted Solution

by:
malexiev earned 400 total points
ID: 1234641
Here it is :

I'm not familiar with Java 2D but I think you should put your "slow" part of code in a thread
like this :

      Thread t = new Thread () {
        public void run() {
           try  {
             PrinterJob printerjob= PrinterJob.getPrinterJob();
             PageFormat pf= printerjob.defaultPage();
             printerjob.setPrintable(new PrintGraphPainter(linegraph.getImages()),pf);
             if (printerjob.printDialog())  {    
                 printerjob.print();                      
             }
          }
          catch (PrinterException pe)  {
            System.out.println("Print Error");
            pe.printStackTrace();
          }
        }
      };
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