PDFlib Cookbook

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pdfua/tagged_pdf_with_textflow

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/* $Id: tagged_pdf_with_textflow.java,v 1.4 2014/01/30 14:05:28 rjs Exp $
 * Tagged PDF with Textflow:
 * Create a Tagged PDF containing a Textflow with appropriate structure elements
 * on several pages
 *
 * Using begin/end_item() and abbreviated Tagging, define a nested Tagged
 * PDF structure with a single structure element containing a Textflow spread
 * over several pages.
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: font file
 */
package com.pdflib.cookbook.pdflib.pdfua;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class tagged_pdf_with_textflow {
    public static void main(String argv[]) {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "tagged_pdf_with_textflow.pdf";
        String title = "Tagged PDF with Textflow";

        pdflib p = null;

        int tf1 = -1, tf2 = -1, font;
        String result;
        final double llx = 50, lly = 50, urx = 400, ury = 400;
        final int width = 450, height = 450;
        int id_sect, id_p;
	int exitcode = 0;

        final String optlist = "fontname=DejaVuSerif fontsize=14 encoding=unicode embedding "
            + "fillcolor={gray 0} charref alignment=justify";

        /*
         * Text placed on one or more pages. Soft hyphens are marked with the
         * character reference "­" (character references are enabled by the
         * charref option).
         */
        final String text1 =
            "Our paper planes are the ideal way of passing the time. We offer "
            + "revolutionary new develop­ments of the traditional common paper "
            + "planes. If your lesson, conference, or lecture turn out to be "
            + "deadly boring, you can have a wonderful time with our planes.\n\n"
            + "All our models are fol­ded from one paper sheet. They are "
            + "exclu­sively folded with­out using any adhesive. Several "
            + "models are equipped with a folded landing gear enabling a safe "
            + "landing on the intended loca­tion provided that you have aimed "
            + "well. Other models are able to fly loops or cover long distances. "
            + "Let them start from a vista point in the mountains and see where "
            + "they touch the ground.\n\n"
            + "Have a look at our new paper plane models!\n\n"
            + "Long Distance Glider\nWith this paper rocket you can send all your "
            + "messages even when sitting in a hall or in the cinema pretty near "
            + "the back.\n\nGiant Wing\nAn unbelievable sailplane! It is amazingly "
            + "robust and can even do aerobatics. But it best suited to gliding."
            + "\n\nCone Head Rocket\nThis paper arrow can be thrown with big "
            + "swing. We launched it from the roof of a hotel. It stayed in the "
            + "air a long time and covered a considerable distance.\n\n"
            + "Super Dart\nThe super dart can fly giant loops with a radius of 4 or"
            + " 5 meters and cover very long distances. Its heavy cone point is "
            + "slightly bowed upwards to get the lift required for loops.\n\n";

        final String text2 =
            "To fold the famous rocket looper proceed as follows:\n\n"
            + "Take an A4 sheet. Fold it lengthwise in the middle. Then, fold the "
            + "upper corners down. Fold the long sides inwards that the points A "
            + "and B meet on the central fold. Fold the points C and D that the "
            + "upper corners meet with the central fold as well. Fold the plane in "
            + "the middle. Fold the wings down that they close with the lower "
            + "border of the plane.";

        try {
            p = new pdflib();

            p.set_option("SearchPath=" + searchpath);

            /* This means we must check return values of load_font() etc. */
            p.set_option("errorpolicy=return");

            /*
             * Open the document. "tagged=true" opens the document in Tagged PDF
             * mode. "lang=en" indicated the predominant document language as
             * English.
             */
            if (p.begin_document(outfile, "pdfua=PDF/UA-1 lang=en "
                        + "tag={tagname=Document Title={Flyer}}") == -1)
                throw new Exception("Error: " + p.get_errmsg());

            p.set_info("Creator", "PDFlib Cookbook");
            p.set_info("Title", title + " $Revision: 1.4 $");

            /* Load the font */
            font = p.load_font("DejaVuSerif", "unicode", "embedding");
            if (font == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Force automatic word breaks */
            p.set_option("autospace=true");

            /* Feed the first text to the first Textflow object */
            tf1 = p.add_textflow(tf1, text1, optlist);
            if (tf1 == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Feed the second text to the second Textflow object */
            tf2 = p.add_textflow(tf2, text2, optlist);
            if (tf2 == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Start the first page */
            p.begin_page_ext(width, height, "");

            /*
             * Open a structure element of type "Section" for all text contents
             * to be included.
             */
            id_sect = p.begin_item("Sect", "Title = {Topic}");

            /* Open a structure element of type "H1" */
            p.setfont(font, 20);
            p.fit_textline("Our Paper Planes", llx, ury + 20,
                "tag={tagname=H1 Title = {Intro}}");
            
            /* Create a bookmark for the header */
            p.create_bookmark("Our Paper Planes", "");

            /*
             * Open a structure element of type "P" for the first Textflow to be
             * included. All parts of the Textflow, i.e. all calls to
             * PDF_fit_textflow() with the specific Textflow handle, should be
             * contained in a single structure element.
             */
            id_p = p.begin_item("P", "Title = {Description}");

            /*
             * Loop until all of the text is placed; create new pages as long as
             * more text needs to be placed.
             */
            do {
                result = p.fit_textflow(tf1, llx, lly, urx, ury,
                    "linespreadlimit=140%");

                p.end_page_ext("");

                /* Start a new page */
                p.begin_page_ext(width, height, "");
            }
            while (result.equals("_boxfull") || result.equals("_nextpage"));

            /* Fit the second Textflow */
            result = p.fit_textflow(tf2, llx, lly, urx, ury,
                "linespreadlimit=140%");

            /* Close the structure element of type "P" */
            p.end_item(id_p);

            p.fit_textline("Read more ...", llx, lly - 20,
                "tag={tagname=P} fontsize=20 font=" + font);

            p.end_page_ext("");

            /* Close the structure element of type "Section" */
            p.end_item(id_sect);

            /* Check for errors */
            if (!result.equals("_stop")) {
                /*
                 * "_boxempty" happens if the box is very small and doesn't hold
                 * any text at all.
                 */
                if (result.equals("_boxempty"))
                    throw new Exception("Error: Textflow box too small");
                else {
                    /*
                     * Any other return value is a user exit caused by the
                     * "return" option; this requires dedicated code to deal
                     * with.
                     */
                    throw new Exception("User return '" + result
                        + "' found in Textflow");
                }
            }

            p.delete_textflow(tf1);
            p.delete_textflow(tf2);

            p.end_document("");
        }
        catch (PDFlibException e) {
            System.err.print("PDFlib exception occurred:\n");
            System.err.print("[" + e.get_errnum() + "] " + e.get_apiname()
                + ": " + e.get_errmsg() + "\n");
	    exitcode = 1;
        }
        catch (Exception e) {
            System.err.println(e.getMessage());
	    exitcode = 1;
        }
        finally {
            if (p != null) {
                p.delete();
            }
	    System.exit(exitcode);
        }
    }
}