PDFlib Cookbook

cookbook

textflow/distance_between_paragraphs

Control the distance between adjacent paragraphs.

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/*
 * 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 9
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.textflow;

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 exitcode = 0;
        int tf = -1;
        String result, optlist;

        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");

            /* 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);

            /* 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.";
            
            /* 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());
            
            /* Demonstrate how to change the leading via add_textflow()
             * instead of using inline option lists:
             * Add a newline via add_textflow(). In a single call to
             * add_texflow() only either "nextline" or "nextparagraph" can be
             * specified, therefore this has to be a separate call to
             * add_textflow().
             */
            optlist = "nextline leading=80%";
            tf = p.add_textflow(tf, "", optlist);
            if (tf == -1)
                throw new Exception("Error: " + p.get_errmsg());
            
            /* Option list to add some more text in a new paragraph in violet
             * color for distinction. The leading is set to 120%.
             */
            optlist = "fontname=Helvetica fontsize=14 encoding=unicode " +
                "fillcolor={rgb 0.95 0.5 0.95} alignment=justify " +
                "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.println("PDFlib exception occurred:");
            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname()
                + ": " + e.get_errmsg());
            exitcode = 1;
        } catch (Exception e) {
            System.err.println(e);
            exitcode = 1;
        } finally {
            if (p != null) {
                p.delete();
            }
            System.exit(exitcode);
        }
    }
}