printing - JavaFX8 Print API : how to set correctly the Printable area

Question

In my javafx application , I'm using JavaFX 8 printing API to print a node , i am getting problem of the printing area , despite i have set the pageLayout with A4 paper .... here is my code :

public static  void printNode(final Node node) throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {
        Printer printer = Printer.getDefaultPrinter();   
        PageLayout pageLayout = printer.createPageLayout(Paper.A4, PageOrientation.PORTRAIT, 0,0,0,0 );      
        PrinterJob job = PrinterJob.createPrinterJob();
        if (job != null  && job.showPrintDialog(node.getScene().getWindow()) ) { 
            boolean success = job.printPage(pageLayout, node);                   
            if (success) {
                job.endJob();
            }
        }

And here is a snapshot of the node that i want to print it is :

and here is what i am getting when i print the node

Answer 1

In your method you need to get the hardware able margins. Even if you set the margins to 0, your printer has a non printable margin around the sheet.

You can view the margins if you print them out:

System.out.println("PageLayout: " + pageLayout.toString());

And you are not able to set the margins to a value less than zero. So you need to scale your Node that would be printed. The node will be scaled, printed and then unscaled.

  public static void printNode(final Node node) throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {
    Printer printer = Printer.getDefaultPrinter();
    PageLayout pageLayout
        = printer.createPageLayout(Paper.A4, PageOrientation.PORTRAIT, Printer.MarginType.HARDWARE_MINIMUM);
    PrinterAttributes attr = printer.getPrinterAttributes();
    PrinterJob job = PrinterJob.createPrinterJob();
    double scaleX
        = pageLayout.getPrintableWidth() / node.getBoundsInParent().getWidth();
    double scaleY
        = pageLayout.getPrintableHeight() / node.getBoundsInParent().getHeight();
    Scale scale = new Scale(scaleX, scaleY);
    node.getTransforms().add(scale);

    if (job != null && job.showPrintDialog(node.getScene().getWindow())) {
      boolean success = job.printPage(pageLayout, node);
      if (success) {
        job.endJob();

      }
    }
    node.getTransforms().remove(scale);
  }

Inspired by the solution found here: https://carlfx.wordpress.com/2013/07/15/introduction-by-example-javafx-8-printing/