PDFlib Cookbook

cookbook

text_output/simple_stamp

Create a stamp across the page which runs diagonally from one corner to the other.

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/*
 * Simple stamp:
 * Create a stamp across the page which runs diagonally from one edge to the
 * other
 *
 * Place a text line as outlines like a stamp in the background of a Textflow.
 * Place a text line like a stamp with a certain opacity on an image.
 * 
 * See Cookbook topic "text_output/watermark" for creating watermark stamps
 * which can be edited in Acrobat.
 *
 * 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 simple_stamp
{
    public static void main (String argv[])
    {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "simple_stamp.pdf";
        String title = "Simple Stamp";

        pdflib p = null;
        int exitcode = 0;
        int font, image, gstate;
        String imagefile = "nesrin.jpg";
        String result;
        int tf = -1;
        final double llx=50, lly=50;

        final String optlist =
            "fontname=Helvetica fontsize=24 encoding=unicode leading=120% charref";

        final String textflow =
            "To fold the famous rocket looper proceed as follows:\n" +
            "Take a DIN A4 sheet.\nFold it lenghtwise in the middle.\nThen, fold " +
            "the upper corners down.\nFold the long sides inwards that the " +
            "points A and B meet on the central fold.\nFold the points C and D " +
            "that the upper corners meet with the central fold as well." +
            "\nFold the plane in the middle. Fold the wings down that they close " +
            "with the lower border of the plane.";

        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);

            /* Page 1 */
            p.begin_page_ext(0, 0, "width=a4.width height=a4.height");

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

            if (font == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Fit the text line as outlines like a stamp in the specified box. The
             * stamp will be placed diagonally from the upper left to the lower
             * right (stamp=ul2lr).
             */
            p.fit_textline("The Famous Rocket Looper", llx, lly, "font=" + font +
                " strokecolor={rgb 1 0 0} textrendering=1 boxsize={500 750} " +
                "strokecolor={rgb 0.5 0 1} stamp=ul2lr");

            /* Place the Textflow on top of the stamp */
            tf = p.add_textflow(tf, textflow, optlist);
            if (tf == -1)
                throw new Exception("Error: " + p.get_errmsg());

            result = p.fit_textflow(tf, 100, 100, 400, 700, "");
            if (!result.equals("_stop"))
            {
                /* Check for errors or more text to be placed */
            }

            p.end_page_ext("");

            /* Page 2 */
            p.begin_page_ext(350, 220, "");

            /* Load and place the image first to have it in the background
            */
            image = p.load_image("auto", imagefile, "");

            if (image == -1)
            throw new Exception("Error: " + p.get_errmsg());

            p.fit_image(image, 0, 0, "scale=0.5");

            /* Save the current graphics state */
            p.save();

            /* Set the opacity in the current graphics state,
             * for the stamp to appear slightly transparent
             */
            gstate = p.create_gstate("opacityfill=0.5");
            p.set_gstate(gstate);

            /* Fit the text line as outlines like a stamp in the specified box.
             * The stamp will be place diagonally from the lower left to the upper
             * right (stamp=ll2ur). It will be drawn in a transparent white 
             * according to the opacity set for the current graphics state.
             */
            p.fit_textline("Our Test Image", 30, 10, "font=" + font +
                " fillcolor={rgb 1 1 1} boxsize={300 200} fontsize=1 stamp=ll2ur");

            p.restore();

            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);
        }
    }
}