CODEWITHSUNDEEP
javajavafxpdfbox
Peter
Peter

Reputation: 35

Javafx-Image To PDF Conversion Displaying Half of the Image Using PDFBox

I have successfully converted an Image to Pdf. My issue is that the pdf is displaying half of the width My Code:

@FXML
private void print() {
    try {
        WritableImage nodeshot = stackPane.snapshot(new SnapshotParameters(), null);
        File file = new File("C:/Users/Andre Kelvin/Desktop/TheNode.png");
        ImageIO.write(SwingFXUtils.fromFXImage(nodeshot, null), "png", file);

        PDDocument doc = new PDDocument();
        PDPage page = new PDPage();
        PDImageXObject pdimage;
        PDPageContentStream content;

        pdimage = PDImageXObject.createFromFile("C:/Users/Andre Kelvin/Desktop/TheNode.png", doc);
        content = new PDPageContentStream(doc, page);
        content.drawImage(pdimage, 0, 0);
        content.close();
        doc.addPage(page);
        doc.save("C:/Users/Andre Kelvin/Desktop/PDFNode.pdf");
        doc.close();
        file.delete();

        //This Line Automatically Opens the user defualt pdf file viewer
        Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + "C:/Users/Andre Kelvin/Desktop/PDFNode.pdf");
    } catch (Exception e) {
    }
}

I have tried getting the root node width and height by using this line:

content.drawImage(pdimage, 0, 0,(float)stackPane.getPrefWidth(),(float)stackPane.getPrefHeight());

and this:

content.drawImage(pdimage, 0, 0,(float)stackPane.getMaxWidth(),(float)stackPane.getMaxHeight());

it will just display a blank white page.

This is the actual image that is Converted to pdf: enter image description here

And this is the pdf of the image: enter image description here

Upvotes: 1

Views: 620

Answers (1)

fabian
fabian

Reputation: 82491

Neither the preferred size properties nor their min/max counterparts allow you to reliably determine the size of a Region. Those are just indicators and the calculated values may not match. Furthermore the Region may be resized to sizes other than the preferred size. Last but not least those properties may contain special values Region.USE_PREF_SIZE(=Double.NEGATIVE_INFINITY) and Region.USE_COMPUTED_SIZE(=-1) and even do so by default.

If you need to get the size of a node, use the boundsInLocal property:

Bounds bounds = stackPane.getBoundsInLocal();

In this case it's simpler to get the size of the snapshot instead though.

Furthermore the page size of the PDPage may not be large enough to contain the whole image. You need to scale the image instead or change the page size of the PDPage.

Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + "C:/Users/Andre Kelvin/Desktop/PDFNode.pdf");

This can be done platform-independent using the HostServices available via the Application instance.

Example

@Override
public void start(Stage primaryStage) {
    Button button = new Button("print");
    StackPane root = new StackPane(button);
    button.setOnAction(evt -> {
        try {
            WritableImage nodeshot = root.snapshot(new SnapshotParameters(), null);
            
            // store image in-memory
            ByteArrayOutputStream output = new ByteArrayOutputStream();
            ImageIO.write(SwingFXUtils.fromFXImage(nodeshot, null), "png", output);
            output.close();

            PDDocument doc = new PDDocument();
            PDPage page = new PDPage();
            PDImageXObject pdimage;
            PDPageContentStream content;

            pdimage = PDImageXObject.createFromByteArray(doc, output.toByteArray(), "png");
            content = new PDPageContentStream(doc, page);

            // fit image to media box of page
            PDRectangle box = page.getMediaBox();
            double factor = Math.min(box.getWidth() / nodeshot.getWidth(), box.getHeight() / nodeshot.getHeight());

            float height = (float) (nodeshot.getHeight() * factor);
            
            // beware of inverted y axis here
            content.drawImage(pdimage, 0, box.getHeight() - height, (float) (nodeshot.getWidth() * factor), height);

            content.close();
            doc.addPage(page);

            File outputFile = new File("C:/Users/Andre Kelvin/Desktop/PDFNode.pdf");

            doc.save(outputFile);
            doc.close();

            getHostServices().showDocument(outputFile.toURI().toString());
        } catch (Exception e) {
        }
    });

    Scene scene = new Scene(root, 300, 300);

    primaryStage.setScene(scene);
    primaryStage.show();
}

Upvotes: 2

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