images/tiling_pattern

 * Tiling pattern:

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

 * background with tiles

 *

 * Required software: PDFlib Lite/PDFlib/PDFlib+PDI/PPS 7

 * 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;

    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_parameter("SearchPath", searchpath);

        /* This means we must check return values of load_font() etc. */

        p.set_parameter("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: 1.2 $");

        /* 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.get_value("imagewidth", image);

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

        /* 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.get_value("resx", image);

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

        /* 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(imagewidth, imageheight, imagewidth,

            imageheight, 1);

        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());

        p.setfont(font, 14);

        p.set_text_pos(20, 700);

        p.show("The page background consists of a small image pattern");

        p.continue_text("which will be output on the page repeatedly.");

        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.getMessage());

        } finally {

            if (p != null) {

                p.delete();

            }

        }

    }

}