Text to Image to File

[Saidul Islam]

Sorry guys if I am posting it in the wrong forum.
I am trying to convert a text value (String) to an image (.jpg). My program seems to be working somewhat. It's creating a blank (whiite background) .jpg file, without my string value "Saidul Islam". I can open the file in any image editor. it just doesn't have the string I am trying to print.
And the strange part is that the program is not even terminating.
Here is the output I get when I run it
<pre>
C:\test>java Text2Image
gets here
flushed
closed
final
dispose
remove notify
done!
</pre>
it's of course printing the last line but the program is not terminating. I have been working on this since yesterday. and my brain is not functioning anymore on this. So I ask for your help.
what am I doing wrong and how do I get this working.
Here is my program-
<pre>
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import com.sun.image.codec.jpeg.*;

public class Text2Image {
public static void main(String args[]) {
Frame myFrame = null;
Graphics2D myGraphics = null;
try {
myFrame = new Frame();
myFrame.addNotify();
BufferedImage buffImage = new BufferedImage(400, 200, BufferedImage.TYPE_INT_RGB);
BufferedImage buff2Image = new BufferedImage(400, 200, BufferedImage.TYPE_INT_RGB);
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("text.jpg"));
Image offImage = myFrame.createImage(400, 200);
//myGraphics = buffImage.getGraphics();
myGraphics = buffImage.createGraphics();
myGraphics.setFont(new Font("Serif", Font.ITALIC, 48));
myGraphics.setColor(Color.red);
myGraphics.drawString("Saidul Islam", 10, 50);
myGraphics.drawImage(offImage, 0, 0, myFrame);
buffImage.createGraphics().drawImage(buffImage, 0, 0, myFrame);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);
encoder.encode(buffImage);

//JpegEncoder jpg = new JpegEncoder(offImage, 80, bos);
//jpg.Compress();

System.out.println("gets here");
bos.flush();
System.out.println("flushed");
bos.close();
System.out.println("closed");

buffImage.flush();
buff2Image.flush();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
System.out.println("final");
if (myGraphics != null) {
myGraphics.dispose();
System.out.println("dispose");
}
if (myFrame != null) {
myFrame.removeNotify();
System.out.println("remove notify");
}
}
System.out.println("done!");
} //end of main method
} //end of Text2Image class
</pre>

Thanks for your help!

[Nathan Pruett]

Saidul,

First, let me say... Really awesome program!

I think I have fixed the problems you were having...

myGraphics.drawImage(offImage, 0, 0, myFrame);

this line was causing the image you had created so far to be overwritten with a blank image of the same size...

I assume that you were trying to assign the image to the frame after you had created it... I couldn't find a direct way to paint a Graphics object or a BufferedImage object, so I simply saved the image first and then displayed it... The code I added isn't the best... there is no double buffering being done to keep the image from being erased in screen redraws, but this could be easily fixed by making a special class to display the image... I just used a regular canvas...

As far as the reason behind why your program would not exit... I think it is because you must specifically call System.exit if you are using any GUI elements... I think Java launches some kind of GUI manager that creates another thread that keeps all the GUI elements alive... so you have to specifically call System.exit...

On to the code...

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import com.sun.image.codec.jpeg.*;
 
public class Text2Image
{
    public static void main(String args[])
    {
        Frame myFrame = null;
        Canvas can = null;
        Graphics2D myGraphics = null;
        try
        {
            myFrame = new Frame();
            can = new Canvas();
            can.setSize( 400, 200 );
            myFrame.add( can );
            myFrame.setSize( 400, 200 );
            myFrame.setVisible( true );
            myFrame.addWindowListener( new WindowAdapter() {
                public void windowClosing( WindowEvent e )
                {
                    System.exit( 0 );
                }
            } );
            BufferedImage buffImage =
                    new BufferedImage(400, 200,
                    BufferedImage.TYPE_INT_RGB);
            BufferedOutputStream bos =
                    new BufferedOutputStream(
                    new FileOutputStream( "text.jpg" ) );
            myGraphics = buffImage.createGraphics();
            myGraphics.setFont(new Font("Serif", Font.ITALIC, 48));
            myGraphics.setColor(Color.red);
            myGraphics.drawString("Saidul Islam", 10, 50);
            //myGraphics.drawImage(offImage, 0, 0, myFrame);
            buffImage.createGraphics().drawImage(buffImage, 0, 0, myFrame);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);
            encoder.encode(buffImage);
  
            Toolkit tk = Toolkit.getDefaultToolkit();
            Image i = tk.getImage( "text.jpg" );
            MediaTracker mt = new MediaTracker( myFrame );
            mt.addImage( i, 0 );
            try
            {
                mt.waitForAll();
            }
            catch( InterruptedException x )
            {
                x.printStackTrace();
            }
  
            Graphics canGraphics = can.getGraphics();
            canGraphics.drawImage( i, 0, 0, myFrame );
            myFrame.repaint();
  
            System.out.println("gets here");
            bos.flush();
            System.out.println("flushed");
            bos.close();
            System.out.println("closed");
            buffImage.flush();
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
            finally
            {
                System.out.println("final");
                if (myGraphics != null)
                {
                    myGraphics.dispose();
                    System.out.println("dispose");
                }
            }
            System.out.println("done!");
    } //end of main method
} //end of Text2Image class

HTH,
-Nate
[This message has been edited by Nathan Pruett (edited May 31, 2001).]

[Saidul Islam]

Thanks Nate. It worked fine. And yes it looks like I have to use System.exit(0) to break out of the program.