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text_output/wrap_text_around_polygons

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/* $Id: wrap_text_around_polygons.java,v 1.4 2013/01/15 10:12:08 stm Exp $ 
 * Wrap text around polygons:
 * Use arbitrary polygons as wrapping shapes for text to wrap around
 * 
 * Use fit_textflow() with the "wrap" option and the "polygons" suboption to
 * wrap text around a triangle positioned relative to the fitbox of the
 * Textflow. Then wrap text around two hexagons positioned with absolute
 * coordinates on the page.
 * 
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.text_output;

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

public class wrap_text_around_polygons
{
    public static void main (String argv[])
    {
    pdflib p = null;
    String searchpath = "../input";
    String outfile = "wrap_text_around_polygons.pdf";
    String title = "Wrap Text around Polygons";
    
    int i, tf = -1;
    String result, heading;
    final double llx = 70, lly = 50, urx = 450, ury = 820;


    /* Repeat the dummy text to produce more contents */
    final int count = 6;

    final String optlist1 =
        "fontname=Helvetica fontsize=10.5 encoding=unicode " +
        "fillcolor={gray 0} alignment=justify";

    final String optlist2 =
        "fontname=Helvetica-Bold fontsize=11 encoding=unicode " +
        "fillcolor={rgb 0 0 1} charref";

    /* Text which is repeatedly placed on the page. Soft hyphens are marked
     * with the character reference "­" (character references are enabled
     * by the charref option).
     */
    final String text =
        "Our paper planes are the ideal way of passing the time. We offer " +
        "revolutionary new develop­ments of the traditional common paper " +
        "planes. If your lesson, conference, or lecture turn out to be " +
        "deadly boring, you can have a wonderful time with our planes. " +
        "All our models are fol­ded from one paper sheet. They are " +
        "exclu­sively folded with­out using any adhesive. Several " +
        "models are equipped with a folded landing gear enabling a safe " +
        "landing on the intended loca­tion provided that you have aimed " +
        "well. Other models are able to fly loops or cover long distances. " +
        "Let them start from a vista point in the mountains and see where " +
        "they touch the ground. ";
    
    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");
        p.set_option("charref=true");

        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: 1.4 $");
        
        
        /* ---------------------------
         * Wrap text around a triangle
         * ---------------------------
         */
        
        /* Create a heading */
        heading = "Page 1: fit_textflow() with option\n" +
            "wrap={polygons={{50% 80%   20% 30%   80% 30%   50% 80%}}}\n\n";
        
        tf = p.add_textflow(tf, heading, optlist2);
        if (tf == -1)
            throw new Exception("Error: " + p.get_errmsg());

        /* Create some amount of dummy text and feed it to a Textflow object
         * with alternating options
         */
        for (i=1; i<=count; i++) {
            String num = i + " ";

            tf = p.add_textflow(tf, num, optlist2);
            if (tf == -1)
                throw new Exception("Error: " + p.get_errmsg());

            tf = p.add_textflow(tf, text, optlist1);
            if (tf == -1)
                throw new Exception("Error: " + p.get_errmsg());
        }

        /* Loop until all of the text is placed; create new pages
         * as long as more text needs to be placed.
         */
        do {
            p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
      
            /* Place the text. Use the "wrap" option with the "polygons"
             * suboption to define a triangle. In this case, each corner of the
             * triangle is specified by a pair of coordinates defined as
             * percentage of the fitbox width or height, respectively.
             */
            result = p.fit_textflow(tf, llx, lly, urx, ury,
                "verticalalign=justify linespreadlimit=120% " +
                "wrap={ polygons={ {50% 80%   20% 30%   80% 30%   50% 80%} } }");

            p.end_page_ext("");

            /* "_boxfull" means we must continue because there is more text;
             * "_nextpage" is interpreted as "start new column"
             */
        } while (result.equals("_boxfull") || result.equals("_nextpage"));

        /* Check for errors */
        if (!result.equals("_stop"))
        {
            /* "_boxempty" happens if the box is very small and doesn't
             * hold any text at all.
             */
            if (result.equals( "_boxempty"))
                throw new Exception ("Error: Textflow box too small");
            else
            {
                /* Any other return value is a user exit caused by
                 * the "return" option; this requires dedicated code to
                 * deal with.
                 */
                throw new Exception ("User return '" + result +
                        "' found in Textflow");
            }
        }
        p.delete_textflow(tf);
        
        
        /* -----------------------------
         * Wrap text around two hexagons
         * -----------------------------
         */
        tf = -1;
        
        /* Create a heading */
        heading = "Page 2: fit_textflow() with option " +
            "wrap={ polygons={\n{150 250   200 350   300 350   350 250   " +
            "300 150   200 150   150 250}\n{130 550   200 650   300 650   " +
            "370 550   300 450   200 450   130 550}}}\n\n";
        
        tf = p.add_textflow(tf, heading, optlist2);
        if (tf == -1)
            throw new Exception("Error: " + p.get_errmsg());

        /* Create some amount of dummy text and feed it to a Textflow object
         * with alternating options
         */
        for (i=1; i<=count; i++) {
            String num = i + " ";

            tf = p.add_textflow(tf, num, optlist2);
            if (tf == -1)
                throw new Exception("Error: " + p.get_errmsg());

            tf = p.add_textflow(tf, text, optlist1);
            if (tf == -1)
                throw new Exception("Error: " + p.get_errmsg());
        }

        /* Loop until all of the text is placed; create new pages
         * as long as more text needs to be placed.
         */
        do {
            p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
      
            /* Place the text. Use the "wrap" option with the "polygons"
             * suboption to define two hexagons. In this case, each corner of
             * the hexagons is specified by a pair of absolute coordinates on
             * the page.
             */
            result = p.fit_textflow(tf, llx, lly, urx, ury,
                "verticalalign=justify linespreadlimit=120% wrap={ polygons={" +
    "{150 250   200 350   300 350   350 250   300 150   200 150   150 250}   " +
    "{130 550   200 650   300 650   370 550   300 450   200 450   130 550}} }");

            p.end_page_ext("");

            /* "_boxfull" means we must continue because there is more text;
             * "_nextpage" is interpreted as "start new column"
             */
        } while (result.equals("_boxfull") || result.equals("_nextpage"));

        /* Check for errors */
        if (!result.equals("_stop"))
        {
            /* "_boxempty" happens if the box is very small and doesn't
             * hold any text at all.
             */
            if (result.equals( "_boxempty"))
                throw new Exception ("Error: Textflow box too small");
            else
            {
                /* Any other return value is a user exit caused by
                 * the "return" option; this requires dedicated code to
                 * deal with.
                 */
                throw new Exception ("User return '" + result +
                        "' found in Textflow");
            }
        }
        p.delete_textflow(tf);

        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();
            }
        }
    }
}