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graphics/transparent_graphics

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/* $Id: transparent_graphics.java,v 1.6 2013/01/15 10:11:59 stm Exp $

 * Transparent graphics:

 * Create some transparent graphics objects

 *

 * Display a yellow rectangle and show some transparent graphics objects

 * overlapping with it. 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: none

 */

package com.pdflib.cookbook.pdflib.graphics;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class transparent_graphics

{

    public static void main (String argv[])

    {

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

    String searchpath = "../input";

    String outfile = "transparent_graphics.pdf";

    String title = "Transparent Graphics";


    pdflib p = null;

   

    int 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: 1.6 $");

       

        /* Load the font. */

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

        if (font == -1)

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


        /* Start page */

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

       

        /* Draw a yellow background rectangle */

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

        p.rect(50, 50, 500, 750);

        p.fill();

       

        /* Display some descriptive red text */

        p.setcolor("fill", "rgb", 0.73, 0.12, 0.30, 0);

        p.fit_textline("Transparent vector graphics", 100, 100, "font=" + font +

            " fontsize=20");

       

        /* 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);

       

        /* Draw a blue rectangle which will be transparent according to the

         * graphics state set

         */

        p.setcolor("fill", "rgb", 0, 0.52, 0.64, 0);

        p.rect(100, 500, 200, 600);

        p.fill();

       

        /* Draw a red circle which will be transparent according to the

         * graphics state set

         */

        p.setcolor("fill", "rgb", 0.73, 0.12, 0.30, 0);

        p.arc(100, 100, 200, 0, 360);

        p.fill();

       

        /* Restore the current graphics state */

        p.restore();

       

        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();

            }

        }

    }

}