[JAVA3D] Printing problems

[Desiree Hilbring]

Hi,

I try to print my Canvas3D. It used to work a month ago, in the meantime
I included changes into the code but, I did not change anything with the
printing. All that I get is a blank page.

Thanks for your help in advance

Desiree

Basically I am using the following methods:

    /**
     * Printing in Java3D needs an additional Canvas with the view, this
     * Canvas is created in this method.
     */
    public void createPrintCanvas() {
        System.out.println("createPrintCanvas");

        // Background
        createBackgroundNode(Color.white);

        if (!hasOffScreen) {
            configTest = SimpleUniverse.getPreferredConfiguration();
            offScreenCanvas3dTest = new
OffScreenCanvas3D(configTest,true);
            // Set the off-screen size based on a scale factor times the
            // on-screen size
            sOn = c.getScreen3D();
            sOff = offScreenCanvas3dTest.getScreen3D();
            dim = sOn.getSize();

            dim.width *= OFF_SCREEN_SCALE;
            dim.height *= OFF_SCREEN_SCALE;
            sOff.setSize(dim);
            sOff.setPhysicalScreenWidth(sOn.getPhysicalScreenWidth() *
                                        OFF_SCREEN_SCALE);
            sOff.setPhysicalScreenHeight(sOn.getPhysicalScreenHeight() *
                                         OFF_SCREEN_SCALE);
            // attach the offscreen canvas to the view

            u.getViewer().getView().addCanvas3D(offScreenCanvas3dTest);
            hasOffScreen = true;
        }

        Point loc = c.getLocationOnScreen();
        offScreenCanvas3dTest.setOffScreenLocation(loc);
        dim = c.getSize();
        dim.width *= OFF_SCREEN_SCALE;
        dim.height *= OFF_SCREEN_SCALE;

        addBackgroundNode();

        u.setJ3DThreadPriority( Thread.currentThread().getPriority() );
        bImage = offScreenCanvas3dTest.doRender(dim.width, dim.height);
        bImage.flush();

        removeBackgroundNode();

        System.runFinalization();
        System.gc();
    }

and doRender in OffScreenCanvas is:

  BufferedImage doRender(int width, int height) {

        BufferedImage bImage =
            new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

        ImageComponent2D buffer =
            new ImageComponent2D(ImageComponent.FORMAT_RGBA, bImage);

        setOffScreenBuffer(buffer);
        renderOffScreenBuffer();
        waitForOffScreenRendering();
        bImage = getOffScreenBuffer().getImage();
        bImage.flush();

        buffer = null;
        System.gc();

        return bImage;
    }

and print:

    /**
     * Method for interface Printable.
     */
    public int print(Graphics g, PageFormat pf, int pi) throws
PrinterException {

        System.out.println("print in GIS3DView");

        if (pi >= 1) {
            return Printable.NO_SUCH_PAGE;
        }

        Graphics2D g2d = (Graphics2D)g;
        g.dispose();
        g = null;
        AffineTransform t2d = new AffineTransform();
        t2d.translate(pf.getImageableX(), pf.getImageableY());
        double xscale  = pf.getImageableWidth() /
(double)bImage.getWidth();
        double yscale  = pf.getImageableHeight() /
(double)bImage.getHeight();
        double scale = Math.min(xscale, yscale);
        t2d.scale(scale, scale);
        try {
            g2d.drawImage(bImage,t2d, this);
            g2d.dispose();
            g2d = null;
        }
        catch (Exception ex) {
            ex.printStackTrace();
            return Printable.NO_SUCH_PAGE;
        }
        System.runFinalization();
        System.gc();
        return Printable.PAGE_EXISTS;
    }

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Desiree Hilbring

Institut fuer Photogrammetrie und Fernerkundung
Universitaet Karlsruhe, Germany
email: [EMAIL PROTECTED]
# 0721 6083676
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