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interactive/link_annotations

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/* $Id: link_annotations.java,v 1.13 2013/01/15 10:12:00 stm Exp $

 * Link annotations:

 * On images and text lines, create links to open PDF files or Web pages or

 * execute a JavaScript.

 *

 * On an image, create a Link annotation to open a URL.

 * On a text line, create a Link annotation to open a URL.

 * On a text line, create a Link annotation to jump to another PDF file.

 * On a text line, create a Link annotation to execute a JavaScript which

 * brings up a message box.

 *

 * Required software: PDFlib/PDFlib+PDI/PPS 9

 * Required data: none

 */

package com.pdflib.cookbook.pdflib.interactive;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class link_annotations

{

    public static void main (String argv[])

    {

    /* This is where the data files are. Adjust as necessary */

    String searchpath = "../input";

    String outfile = "link_annotations.pdf";

    String title = "Link Annotations";

   

    pdflib p = null;


    /* PDF file to be referenced by the link */

    String pdffile = "../input/PLOP-datasheet.pdf";


    /* URL to be referenced by the link */

    String url = "http://www.pdflib.com";


    /* Image to load that will also get a link */

    String imagefile = "websurfer.jpg";


    String optlist;

    int font, action, image, x = 20, y = 400;


    try {

        p = new pdflib();


        /* This means we must check return values of load_font() etc. */

        p.set_option("errorpolicy=return");


        p.set_option("searchpath={" + searchpath + "}");


        if (p.begin_document(outfile, "") == -1)

            throw new Exception("Error: " + p.get_errmsg());


        p.set_info("Creator", "PDFlib Cookbook");

        p.set_info("Title", title + " $Revision: 1.13 $");


        font = p.load_font("Helvetica", "unicode", "");

        if (font == -1)

            throw new Exception("Error: " + p.get_errmsg());


        p.begin_page_ext(0, 0, "width=a4.height height=a4.width");



        /* --- On an image, create a link to open a URL --- */


        /* Place an image and determine the image dimensions via the

         * "image_matchbox" matchbox

         */

        optlist =

            "boxsize={50 50} fitmethod=meet matchbox={name=image_matchbox}";


        image = p.load_image("auto", imagefile, "");

        if (image == -1)

            throw new Exception("Error: " + p.get_errmsg());


        p.fit_image(image, x, y, optlist);

        p.close_image(image);


        /* Create a "URI" action for opening the URL */

        optlist = "url={" + url + "}";

        action = p.create_action("URI", optlist);


        /* Using the matchbox "image_matchbox", create a Link annotation with

         * the "URI" action. 0 rectangle coordinates will be replaced with

         * matchbox coordinates.

         */

        optlist = "action={activate " + action + "} linewidth=0 " +

                  "usematchbox={image_matchbox}";

        p.create_annotation(0, 0, 0, 0, "Link", optlist);



        /* --- On a text line, create a link to open a URL --- */


        /* Place a text line and determine the text dimensions via the

         * "text_matchbox" matchbox */

        optlist =

            "font=" + font + " fontsize=20 " +

            "matchbox={name=text_matchbox} " +

            "fillcolor={rgb 0 0.6 0.6} strokecolor={rgb 0 0.6 0.6} underline";

        p.fit_textline("Go to " + url, x, y-=60, optlist);


        /* Create a "URI" action for opening the URL */

        optlist = "url={" + url + "}";

        action = p.create_action("URI", optlist);


        /* Using the matchbox "text_matchbox", create a Link annotation with

         * the "URI" action. 0 rectangle coordinates will be replaced with

         * matchbox coordinates.

         */

        optlist = "action={activate " + action + "} linewidth=0 " +

                  "usematchbox={text_matchbox}";

        p.create_annotation(0, 0, 0, 0, "Link", optlist);



        /* --- On a text line, create a link to jump to another PDF file --- */


        /* Place a text line and determine the text dimensions via the

         * "goto_matchbox" matchbox

         */

        optlist =

            "font=" + font + " fontsize=20 " +

            "matchbox={name=goto_matchbox} " +

            "fillcolor={rgb 0.6 0.6 0} strokecolor={rgb 0.6 0.6 0} underline";

        p.fit_textline("Jump to file \"" + pdffile + "\"", x, y-=100, optlist);


        /* Create a "GoToR" action for jumping to another PDF file */

        optlist = "filename={" + pdffile + "}" +

            " destination {page 1 type fitwindow} newwindow";

        action = p.create_action("GoToR", optlist);


        /* Using the matchbox "text_matchbox", create a Link annotation with

         * the "GoToR" action. 0 rectangle coordinates will be replaced with

         * matchbox coordinates.

         */

        optlist = "action={activate " + action + "} linewidth=0 " +

            "usematchbox={goto_matchbox}";

        p.create_annotation(0, 0, 0, 0, "Link", optlist);



        /* --- On a text line, create a link to execute a --- *

         * --- JavaScript which brings up a message box   --- */


        /* Place a text line and determine the text dimensions via the

         * "js_matchbox" matchbox

         */

        optlist = "font=" + font + " fontsize=16 " +

            "matchbox={name=js_matchbox} " +

            "fillcolor={rgb 0.6 0 0.6} strokecolor={rgb 0.6 0 0.6} underline";

        p.fit_textline("Launch JavaScript", x, y-=100, optlist);


        /* Create a "JavaScript" action with a script which brings up

         * a message box.

         */

        optlist = "script={app.alert(\"JavaScript works!\")}";

        int js_action = p.create_action("JavaScript", optlist);


        /* Using the matchbox "text_matchbox", create a Link annotation with the

         * "JavaScript" action. 0 rectangle coordinates will be replaced with

         * matchbox coordinates.

         */

        optlist = "action={activate " + js_action + "} linewidth=0 " +

            "usematchbox={js_matchbox}";

        p.create_annotation(0, 0, 0, 0, "Link", optlist);


        p.end_page_ext("");


        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");

        } catch (Exception e) {

            System.err.println(e.getMessage());

        } finally {

            if (p != null) {

                p.delete();

            }

        }

    }

}