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Open Source (LGPL) JavaFX PDF Viewer
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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
 @LICENSE@
 *
 * ---------------
 * DrawAdditionalObjects.java
 * ---------------
 */

package org.jpedal.examples.samples.javafx;

import java.io.File;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Text;
import javafx.scene.transform.Transform;
import javafx.stage.Stage;
import org.jpedal.PdfDecoderFX;
import org.jpedal.examples.viewer.Commands;
import org.jpedal.examples.viewer.ViewerFX;
import org.jpedal.exception.PdfException;

public class DrawAdditionalObjects extends Application {

    ViewerFX myViewer;

    public static void main(final String[] args) {

        launch(args);
    }

    @Override
    public void start(final Stage stage) throws Exception {

        // Create and initialise JPedal viewer component
        myViewer = new ViewerFX(stage, null);

        myViewer.setupViewer();

        myViewer.executeCommand(Commands.OPENFILE, new Object[]{new File("/PDFdata/test_data/Hand_Test/awjune2003.pdf")});

        drawOverFXDisplay();
        
        /*
         * Start never exits so I need to remove on thread to demo feature
         */
        final Thread thread = new Thread() {
            @Override
            public void run() {
                try {
                    Thread.sleep(5000);
                } catch (final InterruptedException ex) {
                    ex.printStackTrace();
                }

                Platform.runLater(new Runnable() {
                    @Override
                    public void run() {
                        System.out.println("Clear page 5 seconds later");
                        clearFXDisplay();
                    }
                });
            }
        };
        thread.start();

    }

    public void clearFXDisplay() {

        final PdfDecoderFX decode_pdf = (PdfDecoderFX) myViewer.getPdfDecoder();

        // Pass into JPEDAL after page decoded - will be removed automatically on new page/open file
        try {
            decode_pdf.flushAdditionalObjectsOnPage(1);
        } catch (final PdfException e) {
            e.printStackTrace();
        }
    }

    public void drawOverFXDisplay() {

        final PdfDecoderFX decode_pdf = (PdfDecoderFX) myViewer.getPdfDecoder();
        
        /*
         * In this example, we create a rectangle, a filled rectangle and draw some text.
        
         * Initialise objects arrays - we will put 3 shapes on the page
         * (using PDF co-ordinates with origin bottom left corner)
         */
        final int count = 3;
        
        /*
         * Due to the way some pdf's are created it is necessery to take the offset of a page
         * into account when addding custom objects to the page. Variables mX and mY represent
         * that offset and need to be taken in to account when placing any additional object
         * on a page.
         */

        final int mX = decode_pdf.getPdfPageData().getMediaBoxX(1);
        final int mY = decode_pdf.getPdfPageData().getMediaBoxY(1);
        final int[] type = new int[count];
        final Object[] obj = new Object[count];

        //
        /*
         * JavaFX implementation
         *
         * JavaFX is much more flexible than Swing so we just implement the custom method and allow user to create Shape in FX
         *
         * Critical part of the code is to invert the Text with
         * t.getTransforms().setAll(Transform.affine(1,0,0,-1,0,0));
         * This is because PDF page is upside down compared to JavaFX.
         */
        final Rectangle strokedRect = new Rectangle(0, 0, 510, 50); //ALSO sets location. Any shape can be used
        strokedRect.setTranslateX(35 + mX);
        strokedRect.setTranslateY(35 + mY);

        strokedRect.setStroke(javafx.scene.paint.Color.RED);
        strokedRect.setFill(null);

        type[0] = org.jpedal.render.DynamicVectorRenderer.CUSTOM;
        obj[0] = strokedRect;


        final Rectangle filledRect = new Rectangle(0, 0, 500, 40); //ALSO sets location. Any shape can be used
        filledRect.setTranslateX(40 + mX);
        filledRect.setTranslateY(40 + mY);

        filledRect.setStroke(null);
        filledRect.setFill(javafx.scene.paint.Color.GREEN);

        type[1] = org.jpedal.render.DynamicVectorRenderer.CUSTOM;
        obj[1] = filledRect;


        final Text t = new Text("Example text on page ");
        t.getTransforms().setAll(Transform.affine(1, 0, 0, -1, 0, 0)); //critical as first step fo text

        t.setFill(javafx.scene.paint.Color.BLUE);

        t.setFont(new javafx.scene.text.Font("Tahoma", 48));
        t.setTranslateX(40 + mX);
        t.setTranslateY(40 + mY);

        type[2] = org.jpedal.render.DynamicVectorRenderer.CUSTOM;
        obj[2] = t;

        //pass into JPEDAL after page decoded - will be removed automatically on new page/open file
        try {
            decode_pdf.drawAdditionalObjectsOverPage(1, type, null, obj);
        } catch (final PdfException e) {
            e.printStackTrace();
        }

        //recode the page to flush your objects
    }
}