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PDF imposition in Java

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Sample Java code for using PDFTron SDK to impose (combine) multiple PDF pages. Page imposition can be used to arrange/order pages prior to printing or for document assembly (assemble a 'master' page from several 'source' pages). It is also possible to write applications that can re-order the pages such that they will display in the correct order when the hard copy pages are compiled and folded correctly. Learn more about our Java PDF Library and PDF Editing & Manipulation Library.

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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

package com.pdftron.android.pdfnetsdksamples.samples;

import com.pdftron.android.pdfnetsdksamples.OutputListener;
import com.pdftron.android.pdfnetsdksamples.PDFNetSample;
import com.pdftron.android.pdfnetsdksamples.R;
import com.pdftron.android.pdfnetsdksamples.util.Utils;
import com.pdftron.pdf.Element;
import com.pdftron.pdf.ElementBuilder;
import com.pdftron.pdf.ElementWriter;
import com.pdftron.pdf.PDFDoc;
import com.pdftron.pdf.Page;
import com.pdftron.pdf.PageIterator;
import com.pdftron.pdf.Rect;
import com.pdftron.sdf.SDFDoc;

import java.util.ArrayList;

//-----------------------------------------------------------------------------------
//The sample illustrates how multiple pages can be combined/imposed
//using PDFNet. Page imposition can be used to arrange/order pages
//prior to printing or to assemble a 'master' page from several 'source'
//pages. Using PDFNet API it is possible to write applications that can
//re-order the pages such that they will display in the correct order
//when the hard copy pages are compiled and folded correctly.
//-----------------------------------------------------------------------------------

public class ImpositionTest extends PDFNetSample {

	private static OutputListener mOutputListener;

	private static ArrayList<String> mFileList = new ArrayList<>();

    public ImpositionTest() {
        setTitle(R.string.sample_imposition_title);
        setDescription(R.string.sample_imposition_description);
    }

	@Override
	public void run(OutputListener outputListener) {
		super.run(outputListener);
		mOutputListener = outputListener;
		mFileList.clear();
		printHeader(outputListener);

        try {
            mOutputListener.println("-------------------------------------------------");
            mOutputListener.println("Opening the input pdf...");

            String filein = Utils.getAssetTempFile(INPUT_PATH + "newsletter.pdf").getAbsolutePath();
            String fileout = Utils.createExternalFile("newsletter_booklet.pdf", mFileList).getAbsolutePath();

            PDFDoc in_doc = new PDFDoc(filein);
            in_doc.initSecurityHandler();

            // Create a list of pages to import from one PDF document to another.
            Page[] copy_pages = new Page[in_doc.getPageCount()];
            int j = 0;
            for (PageIterator itr = in_doc.getPageIterator(); itr.hasNext(); j++) {
                copy_pages[j] = itr.next();
            }

            PDFDoc new_doc = new PDFDoc();
            Page[] imported_pages = new_doc.importPages(copy_pages);

            // Paper dimension for A3 format in points. Because one inch has
            // 72 points, 11.69 inch 72 = 841.69 points
            Rect media_box = new Rect(0, 0, 1190.88, 841.69);
            double mid_point = media_box.getWidth() / 2;

            ElementBuilder builder = new ElementBuilder();
            ElementWriter writer = new ElementWriter();

            for (int i = 0; i < imported_pages.length; ++i) {
                // Create a blank new A3 page and place on it two pages from the input document.
                Page new_page = new_doc.pageCreate(media_box);
                writer.begin(new_page);

                // Place the first page
                Page src_page = imported_pages[i];
                Element element = builder.createForm(src_page);

                double sc_x = mid_point / src_page.getPageWidth();
                double sc_y = media_box.getHeight() / src_page.getPageHeight();
                double scale = sc_x < sc_y ? sc_x : sc_y; // min(sc_x, sc_y)
                element.getGState().setTransform(scale, 0, 0, scale, 0, 0);
                writer.writePlacedElement(element);

                // Place the second page
                ++i;
                if (i < imported_pages.length) {
                    src_page = imported_pages[i];
                    element = builder.createForm(src_page);
                    sc_x = mid_point / src_page.getPageWidth();
                    sc_y = media_box.getHeight() / src_page.getPageHeight();
                    scale = sc_x < sc_y ? sc_x : sc_y; // min(sc_x, sc_y)
                    element.getGState().setTransform(scale, 0, 0, scale, mid_point, 0);
                    writer.writePlacedElement(element);
                }

                writer.end();
                new_doc.pagePushBack(new_page);
            }

            new_doc.save(fileout, SDFDoc.SaveMode.LINEARIZED, null);
            new_doc.close();
            in_doc.close();
            mOutputListener.println("Done. Result saved in newsletter_booklet.pdf...");
        } catch (Exception e) {
            mOutputListener.printError(e.getStackTrace());
        }

		for (String file : mFileList) {
			addToFileList(file);
		}
		printFooter(outputListener);
	}

}
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