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text_output/transparent_part_of_text

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/* $Id: transparent_part_of_text.java,v 1.8 2013/01/15 10:12:08 stm Exp $

 * Transparent part of text:

 * Create transparent text and highlight it with transparent rectangles

 *

 * Use the "opacityfill" and "opacitystroke" options of create_gstate() to

 * create an explicit graphics state with transparency settings.

 * Place a transparent text line in two different ways.

 * First use set_gstate() to set the explicit graphics state before placing the

 * text line.

 * Second use the "gstate" option of fit_textline().

 * Output a Textflow with one word highlighted with a transparent rectangle

 * using the "gstate" suboption of the "matchbox" option of add_textflow().

 * Output a transparent Textflow with one word surrounded by the transparent

 * borders of a rectangle using the "gstate" suboption of the "matchbox" option

 * and the "gstate" option of add_textflow().

 *

 * 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_part_of_text

{

    public static void main (String argv[])

    {

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

    String searchpath = "../input";

    String outfile = "transparent_part_of_text.pdf";

    String title = "Transparent Part of Text";


    pdflib p = null;

   

    String imagefile = "nesrin.jpg";

   

    String text, optlist, mopts, gopts, result;

    int image, gstate, font, tf = -1;

   

    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: 1.8 $");

       

        /* 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 text which will be transparent according to the

         * graphics state set

         */

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

        p.fit_textline("Page 1: My favorite holiday photo", 100, 100,

            "font=" + font + " fontsize=40");

       

        /* Restore the current graphics state */

        p.restore();

       

        p.end_page_ext("");

       

        /* 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, "");

       

       

        /* ------------------------------

         * Output a transparent text line

         * ------------------------------

         */

       

        /* Create an explicit graphics state with the transparency for fill

         * operations set to 40%

         */

        gstate = p.create_gstate("opacityfill=0.4");

       

        /* Display a text line with the explicit graphics state applied. The

         * text will appear transparent.

         */

        optlist =

            "font=" + font + " fontsize=40 " +

            "fillcolor={rgb 1 0.9 0.58} " +

            "gstate=" + gstate;

       

        p.fit_textline("Page 2: My favorite holiday photo", 100, 470,

            optlist);

       

       

        /* --------------------------------------------------------

         * Output a Textflow with the word "favorite" filled with a

         * transparent rectangle

         * --------------------------------------------------------

         */

       

        /* Create an explicit graphics state with the transparency for fill

         * operations set to 40%

         */

        gstate = p.create_gstate("opacityfill=0.4");

       

        /* Define the general Textflow options */

        optlist =

            "fontname=Helvetica-Bold fontsize=30 encoding=unicode " +

            "leading=120% charref fillcolor={rgb 1 0.9 0.58} ";

       

        /* Add parts of the Textflow */

        text = "Here you can see my "

        tf = p.add_textflow(tf, text, optlist);

        if (tf == -1)

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

       

        /* Use the "matchbox" option to define a matchbox rectangle to be

         * filled on parts of the Textflow. To fill the rectangle

         * transparently the matchbox is provided with the graphics state

         * created above.

         */

        mopts = "matchbox={name=mymatchbox boxheight={ascender descender}" +

            " fillcolor={rgb 1 0.9 0.58} gstate=" + gstate +

            " offsetleft=-4 offsetright=4 offsettop=4} ";

       

        /* Use the "gstate" option to apply the explicit graphics state

         * defined above

         */

        gopts = "gstate=" + gstate;

       

        /* Add a part of the Textflow with the "matchbox" and "gstate"

         * options. That part of the text will be filled with a transparent

         * rectangle and will appear transparent.

         */

        text = "favorite";   

        tf = p.add_textflow(tf, text, optlist + mopts + gopts);

        if (tf == -1)

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

       

        /* Define the "matchbox=end" option to end the matchbox */

        mopts = "matchbox=end ";

       

        /* Create another explicit graphics state with no transparency */

        gstate = p.create_gstate("opacityfill=1");

       

        /* Use the "gstate" option to apply the explicit graphics state

         * defined above

         */

        gopts = "gstate=" + gstate;

       

        /* Add parts of the text with the "matchbox=end" option applied.

         * The matchbox rectangle will end before the text to be added.

         * The text will not appear transparent any more.

         */

        text = " holiday photo.";

        tf = p.add_textflow(tf, text, optlist + mopts + gopts);

        if (tf == -1)

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

       

        result = p.fit_textflow(tf, 100, 200, 300, 400, "");

        if (!result.equals("_stop"))

        {

            /* Check for errors or more text to be placed */

        }

        p.delete_textflow(tf);

       

       

        /* -----------------------------------------------------------------

         * Output a transparent Textflow with the word "favorite" surrounded

         * by the transparent borders of a rectangle.

         * -----------------------------------------------------------------

         */

        tf = -1;

       

        /* Create an explicit graphics state with transparency for stroking

         * and filling set to 40%

         */

        gstate = p.create_gstate("opacitystroke=0.4 opacityfill=0.4");

       

        /* Define the general Textflow options including the graphics state

         * defined above

         */

        optlist =

            "fontname=Helvetica-Bold fontsize=30 encoding=unicode " +

            "leading=120% charref fillcolor={rgb 1 0.9 0.58} " +

            "gstate=" + gstate;

       

        /* Add parts of the Textflow */

        text = "This is my "

        tf = p.add_textflow(tf, text, optlist);

        if (tf == -1)

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

       

        /* Use the "matchbox" option for defining a matchbox rectangle to be

         * stroked around parts of the Textflow. To stroke the rectangle

         * transparently the matchbox is provided with the graphics state

         * created above.

         */

        mopts = " matchbox={name=mymatchbox gstate=" + gstate +

            " boxheight={ascender descender} linecap=projecting" +

                " borderwidth=3 strokecolor={rgb 1 0.9 0.58}" +

            " offsetleft=-4 offsetright=4 offsettop=4}";

       

        /* Add a part of the Textflow with the matchbox option */

        text = "favorite";   

        tf = p.add_textflow(tf, text, optlist + mopts);

        if (tf == -1)

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

       

        /* Define the "matchbox=end" option to end the matchbox */

        mopts = " matchbox=end";

       

        /* Add parts of the text with the "matchbox=end" option.

         * The matchbox rectangle will end before the text to be added.

         */

        text = " holiday photo.";

        tf = p.add_textflow(tf, text, optlist + mopts);

        if (tf == -1)

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

       

        result = p.fit_textflow(tf, 650, 100, 780, 280, "");

        if (!result.equals("_stop"))

        {

            /* Check for errors or more text to be placed */

        }

        p.delete_textflow(tf);

 

        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.toString());

        } finally {

            if (p != null) {

                p.delete();

            }

        }

    }

}