Sorry if this is late, attached is the class I use, it was a collaborative
effort on this list several months ago. This class allows printing and jpeg
capturing of the Canvas3d object.
By the way, I'm not very good at documenting things yet. Perhaps one of the more
experienced programmers on the list would like to clean this one up and add
proper documentation then re-post it to the list?
This seems to be a very common request. Maybe the SUN people would like to
include the attached class in the next release? Possibly adding a few other
image formats?
thanks
Don Casteel
Julian wrote:
> Vincent,
>
> I think you can configure your Canvas3D to render to an offscreen-buffer.
> You can then render the contents of the offscreen buffer onto a normal
> (non-3D) Canvas, which in effect replaces your Canvas3D on screen. You
> should then also be able to print this offscreen buffer using the print
> classes.
>
> I haven't done this yet, but the Canvas3D Documentation sounds like it
> should work.
>
> BTW: I only have the Java3D 1.2 Beta API Documentation, if you are still
> using Java3D 1.1 things might be different.
>
> >> Say it ain't so. I'm attempting to use the Java 2 print classes to output
> my
> >> application's Window to a printer. Everything prints fine except the
> >> Canvas3D. It always appears blank, regardless of the contents loaded into
> >> the scene. Is there a trick needed here, or am I doing something too
> weird
> >> for Java? Any code examples would be wonderful. Thanks.
> >>
> >> I thought I could grab the bits from the Canvas3D and draw them to the
> >> printer manually as an ImageIcon, but I haven't found any documentation
> or
> >> examples of how to access the bitmap being used by Canvas3D to render
> with.
>
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import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.image.*;
import java.awt.print.*;
import java.awt.print.PrinterJob;
import java.awt.print.PrinterGraphics;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.Image;
import java.awt.image.ImageObserver;
import java.io.*;
import java.net.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import com.sun.image.codec.jpeg.*;
/** Class PrintCaptureCanvas3D, using the instructions from the Java3D
FAQ pages on how to capture a still image in jpeg format.
A capture button would call a method that looks like
public static void captureImage(PrintCaptureCanvas3D c)
{
c.writeJPEG_ = true;
c.saveJPEG_ = true;
c.repaint();
};
A print button would call a method that looks like
public static void printJPGImage(PrintCaptureCanvas3D c)
{
c.writeJPEG_ = true;
c.saveJPEG_ = false;
c.repaint();
};
Peter Z. Kunszt
Johns Hopkins University
Dept of Physics and Astronomy
Baltimore MD
Working from Mr. Kunszt's posted class, the following enhancements were added:
BufferedImage img; was made global to the class.
The image width was made dynamic using this.getWidth() & this.getHeight() methods.
Printing capability was added (this is still buggy however)
Don Casteel 10/24/1999
[EMAIL PROTECTED]
*/
public class PrintCaptureCanvas3D extends Canvas3D implements Printable, ImageObserver
{
public boolean swapCompleted = false;
public boolean writeJPEG_;
private int postSwapCount_;
public boolean saveJPEG_;
BufferedImage img;
FileDialog fileDialog;
File file;
File directory;
public PrintCaptureCanvas3D(GraphicsConfiguration gc)
{
super(gc);
postSwapCount_ = 0;
}
public void addNotify()
{
super.addNotify();
};
public void postSwap()
{
if(writeJPEG_)
{
System.out.println("Writing JPEG");
GraphicsContext3D ctx = getGraphicsContext3D();
// The raster components need all be set!
Raster ras = new Raster
(
new Point3f(-1.0f,-1.0f,-1.0f),
javax.media.j3d.Raster.RASTER_COLOR,
0,0,
this.getWidth(),this.getHeight(),
new ImageComponent2D
(
ImageComponent.FORMAT_RGB,
new BufferedImage
(
this.getWidth(),
this.getHeight(),
BufferedImage.TYPE_INT_RGB
)
),
null
);
ctx.readRaster(ras);
// Now strip out the image info
img = ras.getImage().getImage();
// write that to disk....
if(saveJPEG_)
{
try
{
FileOutputStream out = new
FileOutputStream("Capture"+postSwapCount_+".jpg");
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param =
encoder.getDefaultJPEGEncodeParam(img);
param.setQuality(0.9f,false); // 90% qualith JPEG
encoder.setJPEGEncodeParam(param);
encoder.encode(img);
writeJPEG_ = false;
out.close();
}
catch ( IOException e )
{
System.out.println("I/O exception!");
};
}
else
{
printMethod();
writeJPEG_ = false;
};
postSwapCount_++;
}
swapCompleted = true;
};
public int print(Graphics g, PageFormat pf, int pi)
throws PrinterException
{
if (pi >= 1)
{
return Printable.NO_SUCH_PAGE;
}
Graphics2D g2d = (Graphics2D)g;
g2d.translate(pf.getImageableX(), pf.getImageableY());
drawObject(g2d);
return Printable.PAGE_EXISTS;
};
public void drawObject(Graphics2D g2d)
{
try
{
g2d.drawImage(img,new AffineTransform(), this);
}
catch (Exception ex)
{
ex.printStackTrace();
};
};
public void printMethod()
{
System.out.println("Print Method Called");
PrinterJob printJob = PrinterJob.getPrinterJob();
PageFormat pageFormat = printJob.defaultPage();
pageFormat = printJob.validatePage(pageFormat);
printJob.setPrintable(this);
if (printJob.printDialog())
{
try
{
printJob.print();
}
catch (Exception ex)
{
System.out.println("Exception Caught");
ex.printStackTrace();
};
};
};
}
