PDFlib Cookbook

cookbook

text_output/transparent_text

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/* $Id: transparent_text.java,v 1.5 2013/01/15 10:12:08 stm Exp $
 * Transparent text:
 * Create some transparent text
 *
 * Display a background image and show transparent text 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.text_output;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class transparent_text
{
    public static void main (String argv[])
    {
    /* This is where the data files are. Adjust as necessary. */
    String searchpath = "../input";
    String outfile = "transparent_text.pdf";
    String title = "Transparent Text";

    pdflib p = null;
    
    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-Bold", "unicode", "");
        if (font == -1)
            throw new Exception("Error: " + p.get_errmsg());

        /* Start page */
        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, 842, 595);
        p.fill(); 
        
        /* Output a background image */
        p.fit_image(image, 50, 50, "");
        
        /* 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 some red text which will be transparent according to the
         * graphics state set
         */
        p.setcolor("fill", "rgb", 1, 0.9, 0.58, 0);
        p.fit_textline("My favorite holiday photo", 100, 100, "font=" + font +
            " fontsize=50");
        
        /* 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();
            }
        }
    }
}