PDFlib Cookbook

cookbook

images/align_text_at_image

Align text at an image.

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/*
 * Align text at image:
 * Align text at an image
 *
 * Align text orientated to the west at the lower right corner of an image by
 * retrieving the coordinates of the image matchbox.
 * Align text orientated to the west at the lower right corner of an image
 * orientated to the west.
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: image file
 */
package com.pdflib.cookbook.pdflib.images;

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

public class align_text_at_image
{
    public static void main (String argv[])
    {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "align_text_at_image.pdf";
        String title = "Align Text at Image";

        pdflib p = null;
        int exitcode = 0;
        String imagefile = "kraxi_logo.tif";
        String optlist;
        int font, image;
        double x1 = 0, x2 = 0, y1 = 0, y2 = 0;

        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);

            /* Start page */
            p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
            
            font = p.load_font("Helvetica", "unicode", "");
            if (font == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Load the image */
            image = p.load_image("auto", imagefile, "");
            if (image == -1)
                throw new Exception("Error: " + p.get_errmsg());
            

            /* -----------------------------------------------------------------
             * Align text orientated to the west at the lower right corner of an
             * image
             * -----------------------------------------------------------------
             */
            
            /* Place the image in the center of a box using the "boxsize" and 
             * "position" options. Maintain its proportions using "fitmethod=meet".
             * Use the "matchbox" option with the "borderwidth" suboption to draw a
             * small rectangle around the image with the "strokecolor" suboption
             * determining the border color. 
             */
            
            /* Fit the image */
            optlist = "boxsize={300 200} position={center} " +
                "fitmethod=meet matchbox={name=giantwing borderwidth=3 " +
                "strokecolor={rgb 0.85 0.83 0.85}}";
            
            p.fit_image(image, 100, 500, optlist);
            
            /* Retrieve the coordinates of the second (lower right) matchbox corner.
             * The parameter "1" indicates the first instance of the "giantwing"
             * matchbox.
             */
            if ((int) p.info_matchbox("giantwing", 1, "exists") == 1) {
                x2 = p.info_matchbox("giantwing", 1, "x2");
                y2 = p.info_matchbox("giantwing", 1, "y2");
            }
            
            /* Start the text line orientated to the west at the corner coordinates
             * retrieved (x2, y2) with a small offset of 3 or 2, respectively.
             */
            optlist = "font=" + font + " fontsize=12 orientate=west";
            
            p.fit_textline("Foto: Kraxi", x2+3, y2+2, optlist);
            
            
            /* -----------------------------------------------------------------
             * Align text orientated to the west at the lower right corner of an
             * image orientated to the west as well.
             * -----------------------------------------------------------------
             */
            
            /* Place the image in the center of a box using the "boxsize" and 
             * "position" options. Maintain its proportions using "fitmethod=meet".
             * Using the "orientate" option orientate the image to the west. Use the
             * "matchbox" option with the "borderwidth" suboption to draw a small
             * rectangle around the image with the "strokecolor" suboption
             * determining the border color. 
             */
            optlist = "boxsize={200 300} position={center} fitmethod=meet " +
                "orientate=west matchbox={name=giantwing borderwidth=3 " +
                "strokecolor={rgb 0.85 0.83 0.85}}";
            
            p.fit_image(image, 100, 100, optlist);
            
            /* Retrieve the coordinates of the first matchbox corner; usually this
             * will be the lower left corner but with being orientated to the west
             * it will be moved to the bottom right. The parameter "2" indicates the
             * second instance of the "giantwing" matchbox.
             */
            if ((int) p.info_matchbox("giantwing", 2, "exists") == 1) {
                x1 = p.info_matchbox("giantwing", 2, "x1");
                y1 = p.info_matchbox("giantwing", 2, "y1");
            }
            
            /* Start the text line orientated to the west at the corner coordinates
             * retrieved (x1, y1) with a small offset of 3 or 2, respectively.
             */
            optlist = "font=" + font + " fontsize=12 orientate=west";
            
            p.fit_textline("Foto: Kraxi", x1+3, y1+2, optlist);
            
            p.close_image(image);

            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);
        }
    }
}