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images/transparent_images

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/* $Id: transparent_images.java,v 1.5 2014/01/30 14:05:25 rjs Exp $

 * Transparent images:

 * Create transparent images

 *

 * Display a colored background rectangle. Output two transparent background

 * images over that rectangle, then output a non-transparent image in the

 * foreground. Create transparency by applying an extended graphics

 * state with the "opacityfill" option set to a value less than 1.

 *

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

 * Required data: image file

 */

package com.pdflib.cookbook.pdflib.images;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class transparent_images

{

    public static void main (String argv[])

    {

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

        String searchpath = "../input";

        String outfile = "transparent_images.pdf";

        String title = "Transparent Images";


        pdflib p = null;

        int exitcode = 0;

       

        String imagefile = "nesrin.jpg";

        int image, gstate, font;


        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: 1.5 $");

            

            /* Load image */

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

            if (image == -1)

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

            

            /* Load the font. */

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

            if (font == -1)

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


            /* Start page 1 */

            p.begin_page_ext(842, 595, "");

            

            /* Draw a yellow background rectangle */

            p.setcolor("fill", "rgb", 1, 0.9, 0.58, 0);

            p.rect(0, 0, 421, 595);

            p.fill();

            

            /* Display some descriptive text */

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

            p.fit_textline("Two transparent background images with a " +

                "non-transparent image placed in the foreground", 50, 530, "font=" +

                font + " fontsize=18");

            

            /* Save the current graphics state. The save/restore of the current

             * state is not necessarily required, but it will help you get back to

             * a graphics state without any transparency.

             */

            p.save();

            

            /* Create an extended graphics state with transparency set to 50%, using

             * create_gstate() with the "opacityfill" option set to 0.5.

             */

            gstate = p.create_gstate("opacityfill=.5");

            

            /* Apply the extended graphics state */

            p.set_gstate(gstate);

            

            /* Display two images which will be transparent according to the

             * graphics state set.

             */

            p.fit_image(image, 0, 0, "boxsize={842 595} position={center bottom}");

            p.fit_image(image, 0, 0, "boxsize={842 595} position={center bottom} " +

                "scale=0.7");

              

            /* Restore the current graphics state */

            p.restore();

            

            /* Display the image again. It will not be transparent since the old

             * graphics state has been restored with no transparency set.

             */

            p.fit_image(image, 0, 0, "boxsize={842 595} position={center bottom} " +

                "scale=0.35");

            

            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);

        }

    }

}