interactive/link_annotations
On images and text lines, create links to open PDF files or Web pages, or to execute JavaScript.
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/*
* 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 10
* 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;
int exitcode = 0;
/* 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 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);
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 =
"fontname=NotoSerif-Regular 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 =
"fontname=NotoSerif-Regular 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 = "fontname=NotoSerif-Regular 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.println("PDFlib exception occurred:");
System.err.println("[" + e.get_errnum() + "] " + e.get_apiname()
+ ": " + e.get_errmsg());
exitcode = 1;
} catch (Exception e) {
System.err.println(e);
exitcode = 1;
} finally {
if (p != null) {
p.delete();
}
System.exit(exitcode);
}
}
}