PDFlib Cookbook

cookbook

graphics/starter_layer

Define several layers, output images and text into them and define particular layers to be visible when opening the document.

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/*
 * Starter layer:
 * Define several layers, output images and text to them and define
 * particular layers to be visible when opening the document
 *
 * Define two layers for RGB or Grayscale images and two layers for English or
 * German image captions. 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 starter_layer
{
    public static void main (String argv[])
    {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "starter_layer.pdf";
        String title = "Starter Layer";

        pdflib p = null;
        String rgb = "nesrin.jpg";
        String gray = "nesrin_gray.jpg";
        int font, imageRGB, imageGray, layerRGB, layerGray, 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");

            /* 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);

            /* 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 "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 should be visible */
            p.set_layer_dependency("Radiobtn", "group={" + layerGray + " " +
                layerRGB + "}");
            
            /* 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 should be visible */
            p.set_layer_dependency("Radiobtn", "group={" + 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.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);
        }
    }
}