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images/tiling_pattern

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/* $Id: tiling_pattern.java,v 1.9 2016/07/27 08:54:07 stm Exp $

 * Tiling pattern:

 * Define a tiling pattern containing an image and use it to cover the page

 * background with tiles.

 *

 * Required software: PDFlib/PDFlib+PDI/PPS 9.0.2

 * Required data: image file

 */

package com.pdflib.cookbook.pdflib.images;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class tiling_pattern {

    public static void main(String argv[]) {

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

        String searchpath = "../input";

        String outfile = "tiling_pattern.pdf";

        String title = "Tiling Pattern";


        pdflib p = null;

        int exitcode = 0;

        String imagefile = "background_image.png";

        int font, image, pattern;

        int pagewidth = 595, pageheight = 842;

        double imagewidth, imageheight, resx, resy;


        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, "") == -1)

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


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

            p.set_info("Title", title + " $Revision: 1.9 $");


            /* Load the background image */

            image = p.load_image("auto", imagefile, "");

            if (image == -1)

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


            /* Retrieve the image dimensions */

            imagewidth = p.info_image(image, "imagewidth", "");

            imageheight = p.info_image(image, "imageheight", "");


            /*

             * The image may have a resolution above 72 dpi. If we used the

             * returned dimensions (in points) for the pattern height and width

             * and placed our image into the pattern, it wouldn't match the

             * pattern size, and a white margin would be left. To make the

             * pattern the same size as the image we calculate the image size

             * based on its resolution.

             *

             * Retrieve the original image resolution:

             */

            resx = p.info_image(image, "resx", "");

            resy = p.info_image(image, "resy", "");


            /* Calculate the image dimensions for 72 dpi */

            if (resx > 0) {

                imagewidth = imagewidth * 72 / resx;

                imageheight = imageheight * 72 / resy;

            }


            /*

             * Create a pattern using the retrieved image dimensions. The

             * painttype parameter must be set to 1 since a colorized image is

             * used (as opposed to an image mask).

             */

            pattern = p.begin_pattern_ext(imagewidth, imageheight, "");

            p.fit_image(image, 0, 0, "");

            p.end_pattern();

            p.close_image(image);


            /* Start page */

            p.begin_page_ext(pagewidth, pageheight, "");


            /*

             * Set a fill color and create and fill a rectangle with the

             * dimensions of the page. Encapsulate the setcolor() call with

             * save() and restore() to be able to proceed with the original

             * colors.

             */

            p.save();

            p.setcolor("fill", "pattern", pattern, 0, 0, 0);

            p.rect(0, 0, pagewidth, pageheight);

            p.fill();

            p.restore();


            /* Output some page contents */

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

            if (font == -1)

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


            int fontsize = 14;

            p.set_text_option("font=" + font + " fontsize=" + fontsize);

            p.fit_textline(

                "The page background consists of a small image pattern",

                20, 700, "");

            p.fit_textline(

                "which will be output on the page repeatedly.",

                20, 700 - fontsize, "");


            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");

            exitcode = 1;

        }

        catch (Exception e) {

            System.err.println(e.getMessage());

            exitcode = 1;

        }

        finally {

            if (p != null) {

                p.delete();

            }

            System.exit(exitcode);

        }

    }

}