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general/metric_topdown_coordinates

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/* $Id: metric_topdown_coordinates.java,v 1.5 2013/01/15 10:11:58 stm Exp $

 * Metric topdown coordinates:

 * Output text using metric coordinates in a topdown coordinate system

 *

 * Use topdown coordinates starting from the top left instead from the bottom

 * left, scale the coordinate system to use metric coordinates, and place some

 * horizontal lines 1 cm from each other.

 * 

 * Required software: PDFlib/PDFlib+PDI/PPS 9

 * Required data: none

 */

package com.pdflib.cookbook.pdflib.general;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class metric_topdown_coordinates

{

    public static void main (String argv[])

    {

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

    String searchpath = "../input";

    String outfile = "metric_topdown_coordinates.pdf";

    String title = "Metric Topdown Coordinates";


    pdflib p = null;

    int 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 $");

       

        font = p.load_font("Helvetica", "unicode", "");

        if (font == -1)

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

       

        /* Use topdown coordinates */

        p.set_option("topdown=true");

       

        /* Start an A4 page */

        p.begin_page_ext(0, 0, "width=a4.width height=a4.height");

       

        /* Scale the coordinate system to use metric coordinates.

         * By default, PDFlib will expect incoming coordinates in DTP points

         * which are defined as: 1 pt = 1/72 inch = 25.4/72 mm = 0.3528 mm.

         * In order to supply the coordinates in centimeters instead of points

         * we have to calculate the scaling factor as follows:

         * (72 points/inch) / (2.54 cm/inch) = 28.3465 points/cm.

         */

        p.scale(28.3465, 28.3465);

       

        /* Now, PDFlib will interpret all coordinates (except for interactive

         * features, see below) in centimeters. The scaling is only in effect

         * for the current page, and must be repeated on each page (if so

         * desired).

         */

       

        /* Interpret all coordinates for hypertext elements in the coordinates

         * defined above as well

         */

        p.set_option("usercoordinates=true");

       

        /* Place some horizontal lines 1 cm from each other.

         * With the third line, draw a rectangle.

         */

        p.setlinewidth(0.01);

     

        for (int i = 1; i < 29; i++) {

            p.moveto(0, i);

            p.lineto(1, i);

            if (i == 3) {

                p.rect(0, i, 1, 1);

            }

                p.fill_stroke();

        }

       

        /* Set the font size in cm */

        p.setfont(font, 0.5);

       

        p.fit_textline("Centimeters from the top left instead of points from " +

            "the bottom left:", 2, 5, "");

        p.fit_textline("The small lines on the left are placed 1 cm from " +

            "each other.", 2, 6, "");

        p.fit_textline("This text line is displayed at 7 cm from top and 2 " +

            "cm from the left.", 2, 7, "");

       

        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();

            }

        }

    }

}