Bill Day <[EMAIL PROTECTED]> wrote:
>Uwe Trostheide <[EMAIL PROTECTED]> wrote:
>> is it possible to get an Image (e.g .jpg or .gif)
>> out of a java3d program?
>>
>There is an entry in the Java 3D FAQ discussing
>how to capture still images from Java 3D:
>
>http://tintoy.ncsa.uiuc.edu/~srp/java3d/howto.html#capture
>
>Once you have the BufferedImage containing the
>bits as outlined above, you can then save them
>to disk as a JPEG using Java 2D. I describe how to
>do this in my "Media Programming FAQ". You can
>find the applicable FAQ item by searching for
>"snapshot" in the FAQ, which is at:
> http://www.billday.com/Work/mediafaq.txt
>
I was trying to do the same thing (get an image), so
I combined the code from the two FAQs, it looked good and compiled
but unfortunately it did not work (I tried WinNT and Linux).
I get a NullPointerException when I try to read the Raster.
What am I doing wrong? Any ideas?
Thanx
Ingar
This is the exception I get:
Exception occurred during Canvas3D callback:
java.lang.NullPointerException
at javax.media.j3d.GraphicsContext3D.readRaster(Compiled Code)
at MyCanvas3D.postSwap(Compiled Code)
at javax.media.j3d.Renderer.run(Compiled Code)
Some excerpts from my code:
My subclass of Canvas3D:
public class MyCanvas3D extends Canvas3D
{ boolean print = false;
public MyCanvas3D(GraphicsConfiguration g)
{ super(g);
}
public void activatePrint()
{ print = true;
}
public void postSwap()
{ if (print)
{ // From java3d FAQ
// http://tintoy.ncsa.uiuc.edu/~srp/java3d/howto.html#capture
GraphicsContext3D ctx = getGraphicsContext3D();
javax.media.j3d.Raster ras = new javax.media.j3d.Raster();
ctx.readRaster(ras);
// Now strip out the image info
ImageComponent2D img_src = ras.getImage();
DepthComponent depth = ras.getDepthComponent();
BufferedImage img = img_src.getImage();
// From mediafaq.txt
// http://www.billday.com/Work/mediafaq.txt
try
{ OutputStream out = new FileOutputStream("test.jpg");
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(img);
out.close();
}
catch (Exception ex)
{ System.out.println(ex); }
}
}
}
Some lines from the class that calls repaint():
...
canvas = new MyCanvas3D(c);
...
frame.add(BorderLayout.CENTER, canvas);
Button buttonPrint = new Button("Print");
buttonPrint.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
canvas.activatePrint();
canvas.repaint();
System.out.println("Test, in TextDrucken");
}
});
frame.add(BorderLayout.SOUTH, buttonPrint);
frame.show();
...
--
Ingar Uhe [EMAIL PROTECTED]
Universitaet Koblenz-Landau
Institut fuer Softwaretechnik Fon: +49 261 287-2702
Rheinau 1, D-56075 Koblenz, Germany Fax: +49 261 287-2721
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