interchange/tagged_pdf_with_textflow
Create a Tagged PDF containing a Textflow with appropriate structure elements over several pages. Using begin_item(), activate_item() and end_item(), define a nested Tagged PDF structure with a single structure element containing a Textflow spread over several pages.
Download Java Code Show Output PDF
* Tagged PDF with Textflow:
* Create a Tagged PDF containing a Textflow with appropriate structure elements
* over several pages
*
* Using begin_item(), activate_item() and end_item(), define a nested Tagged
* PDF structure with a single structure element containing a Textflow spread
* over several pages.
*
* Required software: PDFlib/PDFlib+PDI/PPS 7.0.3
* The basic code also works with PDFlib/PDFlib+PDI/PPS 7.0.0-7.0.2, but these
* versions require the "lang" option in begin_document() or end_document().
* Required data: none
*/
package com.pdflib.cookbook.pdflib.interchange;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
public class tagged_pdf_with_textflow
{
public static void main (String argv[])
{
String outfile = "tagged_pdf_with_textflow.pdf";
String title = "Tagged PDF with Textflow";
pdflib p = null;
/* Required minimum PDFlib version */
final double requiredversion = 703;
final String requiredvstr = "7.0.3";
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_art, id_sect, id_h1, id_p;
final String optlist =
"fontname=Helvetica fontsize=14 encoding=unicode " +
"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();
/* This means we must check return values of load_font() etc. */
p.set_parameter("errorpolicy", "return");
/* Check whether the required minimum PDFlib version is available */
double major = p.get_value("major", 0);
double minor = p.get_value("minor", 0);
double revision = p.get_value("revision", 0);
if (major*100 + minor*10 + revision < requiredversion)
throw new Exception("Error: PDFlib " + requiredvstr +
" or above is required");
/* Open the document.
* "tagged=true" opens the document in Tagged PDF mode.
* "lang=en" indicated the predominant document language as English.
* "openmode=tagged"
*/
if (p.begin_document(outfile, "tagged=true") == -1)
throw new Exception("Error: " + p.get_errmsg());
p.set_info("Creator", "PDFlib Cookbook");
p.set_info("Title", title + " $Revision: 1.11 $");
/* Load the font */
font = p.load_font("Helvetica-Bold", "unicode", "");
if (font == -1)
throw new Exception("Error: " + p.get_errmsg());
/* Force automatic word breaks */
p.set_parameter("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());
/* Open a structure element of type "Article" */
id_art = p.begin_item("Art", "Title = {Flyer}");
/* 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" */
id_h1 = p.begin_item("H1", "Title = {Intro}");
p.setfont(font, 20);
p.fit_textline("Our Paper Planes", llx, ury + 20, "");
/* Close the structure element of type "H1" */
p.end_item(id_h1);
/* 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.setfont(font, 20);
p.fit_textline("Read more ...", llx, lly - 20, "");
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);
/* Close the structure element of type "Article" */
p.end_item(id_art);
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();
}
}
}
}