/* $Id: distance_between_paragraphs.java,v 1.1 2008/04/18 21:54:31 katja Exp $
 * Distance between paragraphs:
 * Control the distance between adjacent paragraphs
 * 
 * In many cases more distance between adjacent paragraphs is desired than
 * between the lines within a paragraph. To achieve this use the "nextline",
 * "leading", and "nextparagraph" options of add/create_textflow() to insert an
 * extra empty line with a suitable leading value and then start a new paragraph
 * with the initial leading. 
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 7
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.text_output;

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

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

    pdflib p = null;
    int tf = -1;
    String result, optlist;

    try {
        p = new pdflib();

        p.set_parameter("SearchPath", searchpath);

        /* This means we must check return values of load_font() etc. */
        p.set_parameter("errorpolicy", "return");

        /* Set an output path according to the name of the topic */
        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: 1.1 $");

        /* Create an A4 page */
        p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
        
        /* Text to be created. Gain some additional space between the first
         * and the second paragraph using the inline options
         * <nextline leading=150%>. This will create an empty line with its 
         * baseline having a distance of 150% from the last line of the previous
         * paragraph (where 100% equals the most recently set value of the font
         * size). 
         * With <nextparagraph leading=120%> a new line is started and the 
         * leading is reset to the initial value (defined in the option list
         * below).
         */
        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." +
            "<nextline leading=150%><nextparagraph leading=120%>" +
            "Have a look at our new paper plane models!" +
            "<nextline leading=80%><nextparagraph leading=120%>" +
            "Long Distance Glider: "+
            "With this paper rocket you can send all your messages even when " +
            "sitting in a hall or in the cinema pretty near the back. " +
            "<nextline leading=80%><nextparagraph leading=120%>" +
            "Giant Wing: " +
            "An unbelievable sailplane! It is amazingly robust and can even " +
            "do aerobatics. But it best suited to gliding." +
            "<nextline leading=80%><nextparagraph leading=120%>" +
            "Cone Head Rocket: " +
            "This paper arrow can be thrown with big swing. We launched it " +
            "from the roof of a hotel. It stayed in the air a long time and " +
            "covered a considerable distance. " +
            "<nextline leading=80%><nextparagraph leading=120%>" +
            "Super Dart: " +
            "The super dart can fly giant loops with a radius of 4 or 5 " +
            "metres and cover very long distances. Its heavy cone point is " +
            "slightly bowed upwards to get the lift required for loops." +
            "<nextline leading=80%><nextparagraph leading=120%>";
        
        /* Some more text to be added */
        String moretext =
            "German Bi-Plane: " +
            "Brand-new and ready for take-off. If you have lessons in the " +
            "history of aviation you can show your interest by letting it " +
            "land on your teacher's desk.";
        
        /* Option list to create the Textflow. 
         * The leading is initially set to 120%.
         */
        optlist = "fontname=Helvetica fontsize=14 encoding=unicode " +
            "fillcolor={gray 0} leading=120% alignment=justify";
             
        /* Create the Textflow with the option list defined above */
        tf = p.create_textflow(text, optlist);
        if (tf == -1)
            throw new Exception("Error: " + p.get_errmsg());
        
        /* Option list to add some more text in violet color for distinction. 
         * The leading is initially set to 120%.
         * With "nextline leading=150%" an empty line is created with a leading
         * of 150%.
         * With "nextparagraph leading=120%" a new line is started and the
         * leading is reset to the initial value of 120%.
         */
        optlist = "fontname=Helvetica fontsize=14 encoding=unicode " +
            "fillcolor={rgb 0.95 0.5 0.95} leading=120% alignment=justify " +
            "nextline leading=150% nextparagraph leading=120%";
        
        /* Add some more text using the option list defined above */
        tf = p.add_textflow(tf, moretext, optlist);
        if (tf == -1)
            throw new Exception("Error: " + p.get_errmsg());
        
        /* Fit the Textflow */
        result = p.fit_textflow(tf, 100, 100, 500, 700,
            "verticalalign=justify linespreadlimit=120% ");
        
        if (!result.equals("_stop"))
        {
            /* Check for errors */
        }
        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.getMessage());
        } finally {
            if (p != null) {
                p.delete();
            }
        }
    }
}