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graphics/hierarchical_layers

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/* $Id: hierarchical_layers.java,v 1.4 2013/01/15 10:11:59 stm Exp $

 * Hierarchical layers:

 * Define a layer hierarchy using the parent and child options.

 *

 * Define the layer "Languages" with the layers "English" and "German" and use

 * set_layer_dependency() with the "parent" option to specify a hierarchy

 * between them. Define the layer "Images" with the layers "RGB" and "Grayscale"

 * and use set_layer_dependency() with the "parent" option to specify a

 * hierarchy between them. Output images and text on the various layers and

 * open the document with the RGB images and English captions visible.

 *

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

 * Required data: grayscale and RGB images

 */

package com.pdflib.cookbook.pdflib.graphics;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class hierarchical_layers

{

    public static void main (String argv[])

    {

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

    String searchpath = "../input";

    String outfile = "hierarchical_layers.pdf";

    String title = "Hierarchical Layers";


    pdflib p = null;

    String rgb = "nesrin.jpg";

    String gray = "nesrin_gray.jpg";

    int font, imageRGB, imageGray;

    int layerImage, layerRGB, layerGray, layerLang, layerEN, layerDE;


    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 with the "Layers" navigation tab visible */

        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 + " $Revision: 1.4 $");


        /* Load the font */

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

        if (font == -1)

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


        /* Load the Grayscale image */

        imageGray = p.load_image("auto", gray, "");

        if (imageGray == -1)

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


        /* Load the RGB image */

        imageRGB = p.load_image("auto", rgb, "");

        if (imageRGB == -1)

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

       

        /* Define all layers which will be used, and their relationships. This

         * should be done before the first page if the layers are used on more

         * than one page.

         */

       

        /* Define the layer "Images" */

        layerImage = p.define_layer("Images", "");

       

        /* Define the layer "RGB" */

        layerRGB = p.define_layer("RGB", "");

       

        /* Define the layer "Grayscale" which is hidden when opening the

         * document or printing it.

         */

        layerGray = p.define_layer("Grayscale",

            "initialviewstate=false initialprintstate=false");

       

        /* At most one of the "Grayscale" and "RGB" layers will be visible */

        p.set_layer_dependency("Radiobtn",

            "group={" + layerGray + " " + layerRGB + "}");

       

        /* Make the "Images" layer to be the parent of the "RGB" and "Grayscale"

         * layers

         */

        p.set_layer_dependency("Parent", "parent=" + layerImage +

            " children={" + layerGray + " " + layerRGB + "}");

           

        /* Define the  layer "Languages" */

        layerLang = p.define_layer("Languages", "");

       

        /* Define the layer "English" */

        layerEN = p.define_layer("English", "");

       

        /* Define the layer "German" which is hidden when opening the document

         * or printing it.

         */

        layerDE = p.define_layer("German",

            "initialviewstate=false initialprintstate=false");

       

        /* At most one of the "English" and "German" layers will be visible */

        p.set_layer_dependency("Radiobtn", "group={" + layerEN + " " +

            layerDE + "}");

       

        /* Make the "Languages" layer to be the parent of the "German" and

         * "English" layers

         */

        p.set_layer_dependency("Parent", "parent=" + layerLang +

            " children={" + layerEN + " " + layerDE + "}");


        /* Start the page */

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


        /* Place the RGB image on the "RGB" layer */

        p.begin_layer(layerRGB);

        p.fit_image(imageRGB, 100, 400, "boxsize={400 300} fitmethod=meet");

       

        /* Place the Grayscale image on the "Grayscale" layer */

        p.begin_layer(layerGray);

        p.fit_image(imageGray, 100, 400, "boxsize={400 300} fitmethod=meet");


        /* Place an English image caption on the "English" layer */

        p.begin_layer(layerEN);

        p.fit_textline("This is the Nesrin image.", 100, 370, "font=" + font +

            " fontsize=20");


        /* Place a German image caption on the "German" layer */

        p.begin_layer(layerDE);

        p.fit_textline("Das ist das Nesrin-Bild.", 100, 370, "font=" + font +

            " fontsize=20");


        p.end_layer();


        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.toString());

        } finally {

            if (p != null) {

                p.delete();

            }

        }

    }

}