PDFlib Cookbook

cookbook

pdf_import/import_pages_into_layers

Import two pages and place them on two layers on the same output page.

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/*
 * Import pages into layers:
 * Import two pages and output them on two layers on the same page
 *
 * Import an English and a German PDF page and place them on an English and a
 * German layer on the same page.
 *
 * Required software: PDFlib+PDI/PPS 9
 * Required data: PDF document
 */
package com.pdflib.cookbook.pdflib.pdf_import;

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

public class import_pages_into_layers
{
    public static void main (String argv[])
    {
	/* This is where the data files are. Adjust as necessary. */
	String searchpath = "../input";
	String outfile = "import_pages_into_layers.pdf";
	String title = "Import Pages into Layers";

	pdflib p = null;
	String fileEN = "PDFlib-real-world.pdf";
	String fileDE = "PDFlib-real-world-D.pdf";
	int indocEN, indocDE, pageEN, pageDE;
	int layerEN, layerDE;
	int exitcode = 0;

	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");

	    if (p.begin_document(outfile, "openmode=layers") == -1)
		throw new Exception("Error: " + p.get_errmsg());

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

	    /* Open the first page of the English input PDF */
	    indocEN = p.open_pdi_document(fileEN, "");
	    if (indocEN == -1)
		throw new Exception("Error: " + p.get_errmsg());

	    pageEN = p.open_pdi_page(indocEN, 1, "");
	    if (pageEN == -1)
		throw new Exception("Error: " + p.get_errmsg());
	    
	    /* Open the first page of the German input PDF */
	    indocDE = p.open_pdi_document(fileDE, "");
	    if (indocDE == -1)
		throw new Exception("Error: " + p.get_errmsg());

	    pageDE = p.open_pdi_page(indocDE, 1, "");
	    if (pageDE == -1)
		throw new Exception("Error: " + p.get_errmsg());

	    /* Start the page */
	    p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
	    
	    /* Define the layer "English" and place some English text on it */
	    layerEN = p.define_layer("English", "");
	    p.begin_layer(layerEN);

	    /* Place the imported page on the English layer of the output page */
	    p.fit_pdi_page(pageEN, 0, 0, "");

	    p.close_pdi_page(pageEN);
	    
	    /* Define the layer "German" which is hidden when opening the document
	     * or printing it
	     */
	    layerDE = p.define_layer("German", "initialviewstate=false " +
		"initialprintstate=false");
	    p.begin_layer(layerDE);
	    
	    /* Place the imported page on the German layer of the output page */
	    p.fit_pdi_page(pageDE, 0, 0, "");

	    p.close_pdi_page(pageDE);
	    
	    /* At most one of the "English" and "German" layers should be visible */
	    p.set_layer_dependency("Radiobtn", "group={" + layerEN + " " +
		layerDE + "}");
	    
	    /* Complete all layers */
	    p.end_layer();

	    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);
        }
    }
}