Printing JavaFX charts

[plusik]

When ChartVIewer is printed using standard JavaFX printing tool PrinterJob.printPage(node), the resulting image is very poor (low resolution).
In contrast, printing from the Swing JFreeChart is very sharp.

The issue is probably related to printing the contents of a Canvas (see e.g., http://stackoverflow.com/questions/3198 ... -in-javafx).

I have been trying to find a workaround, but so far I was unable to solve this. Has anyone dealt with this issue?

[david.gilbert]

I hadn't tried the JavaFX printing before, but it does seem to be limited versus the Swing printing API. I couldn't find a way to improve the quality of the JavaFX output. I wonder if the approach of taking a scaled snapshot of the node, then somehow printing the image might work...see this Stack Overflow entry for some info:

http://stackoverflow.com/questions/2918 ... 3#29196173

[plusik]

I tried that approach. The Scale transformation increases the size of the image, but not the resolution. The final image is very pixelated.

[david.gilbert]

Do you need the print setup dialog or are you doing silent printing? In the latter case you could just use the AWT printer job.

[plusik]

Using AWT might be the best approach, until the printing support in JavaFX gets some improvements.

I am not sure, though, how to obtain the AWT Printable from the JavaFX ChartViewer.

[plusik]

OK, I found how to do it. The trick is that one JFreeChart can be added to both ChartViewer (JavaFX) and ChartPanel (Swing) at the same time.
Printing via AWT using the following code creates a nice, sharp output:

Code: Select all

        SwingUtilities.invokeLater(() -> {
            PrinterJob job = PrinterJob.getPrinterJob();
            PageFormat pf = job.defaultPage();
            PageFormat pf2 = job.pageDialog(pf);
            if (pf2 == pf)
                return;
            ChartPanel p = new ChartPanel(chartViewer.getChart());
            job.setPrintable(p, pf2);
            if (!job.printDialog())
                return;
            try {
                job.print();
            } catch (PrinterException e) {
                e.printStackTrace();
            }
        });

[nirmal]

I have heard, JavaFX increases the size of the image, but not the resolution in print version. I never use it. Anyone suggest me a link to JavaFX API.

[John Matthews]

See JFreeChart-FX.