PDFlib Cookbook

cookbook

text_output/text_on_color

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/* $Id: text_on_color.java,v 1.14 2013/12/30 10:50:38 stm Exp $
 * Text on colored background:
 * Place a text line and a Textflow on a colored background
 *
 * Place a text line on a colored background using info_textline() to get the
 * dimensions of the text line. Place a text line using the "matchbox" option
 * which provides a more versatile way for text calculations.
 * Fit a Textflow on a colored background. The colored background is
 * created with a Textflow matchbox.
 *
 * 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 text_on_color {
    public static void main(String argv[]) {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "text_on_color.pdf";
        String title = "Text on colored Background";

        pdflib p = null;
        int font, tf = -1, x = 50, y;
        String result, optlist;
        double width, height;

        String textline = "Giant Wing Paper Plane";

        String textflow = 
            "To fold the famous rocket looper proceed as follows:\nTake a A4 "
            + "sheet. Fold it lenghtwise in the middle. Then, fold the upper "
            + "corners down. Fold the long sides inwards that the points A "
            + "and B meet on the central fold. Fold the points C and D that "
            + "the upper corners meet with the central fold as well. Fold 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 + " $Revision: 1.14 $");

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

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

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

            /* --------- Text line: Method I -------- */

            /*
             * Place a text line with a colored background using info_textline()
             * for retrieving the width and height of the default box for the
             * text. The height will be the capheight of the font by default. To
             * use another font property use the "matchbox" option as shown
             * below.
             */
            optlist = "font=" + font + " fontsize=40 " + "fillcolor={gray 1}";
            width = p.info_textline(textline, "width", optlist);
            height = p.info_textline(textline, "height", optlist);

            /* Draw a rectangle with exactly the retrieved width and height */
            p.setcolor("fill", "rgb", 0.0, 0.8, 0.8, 0);
            p.rect(x, 700, width, height);
            p.fill();

            /* Place the text line on the rectangle */
            p.fit_textline(textline, x, 700, optlist);

            /* --------- Text line: Method II -------- */

            /*
             * Place a text line with a colored background in a single
             * fit_textline() call. The "matchbox" option is used to specify the
             * rectangle to be colored. The "boxheight" suboption defines the
             * height of the matchbox while "offsetbottom" and "offsettop" adds
             * some space at the top and bottom. The width of the matchbox is
             * specified by the text width plus the space defined by
             * "offsetleft" and "offsetright".
             */
            optlist = "font=" + font + " fontsize=40 fillcolor={gray 1} "
                + "matchbox={fillcolor={rgb 0 0.8 0.8} "
                + "boxheight={ascender descender}}";

            /* Place the text line */
            p.fit_textline(textline, x, 600, optlist);

            /*
             * To increase the matchbox beyond the text, use "offsetbottom" and
             * "offsettop" to add some space at the top and bottom. Use
             * "offsetleft" and "offsetright" to add some space to the left and
             * right.
             */
            optlist = "font=" + font + " fontsize=40 fillcolor={gray 1} "
                + "matchbox={fillcolor={rgb 0 0.8 0.8} "
                + "boxheight={ascender descender} "
                + "offsetleft=-8 offsetright=8 offsettop=8 offsetbottom=-8}";

            /* Place the text line */
            p.fit_textline(textline, x, 500, optlist);

            /* --------- Textflow on a colored background -------- */

            /*
             * Place a white Textflow on a green background. The
             * background is created with a matchbox.
             */
            optlist = "font=" + font + " fontsize=20 fillcolor={gray 1}";

            tf = p.add_textflow(tf, textflow, optlist);
            if (tf == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Vertical start of the rectangle. */
            y = 430;

            /* Width for textflow */
            width = 500;

            /*
             * Now fit the textflow while creating a colored matchbox as
             * background.
             */
            result = p.fit_textflow(tf, x, 0, x + width, y,
                "matchbox={fillcolor={rgb 0.0 0.8 0.8}}");
            if (!result.equals("_stop")) {
                /* Check for errors or more text to be placed */
            }

            /* Get the height of the Textflow placed. */
            height = p.info_textflow(tf, "textheight");

            /*
             * Place next rectangle by moving the vertical start point down
             * according to the height of the previous textflow plus an
             * additional offset.
             */
            y -= height + 50;

            /*
             * Fit the Textflow a second time and this time add a margin for the
             * matchbox. To rewind to the initial Textflow status use
             * "rewind=1".
             */
            result = p.fit_textflow(tf, x, 0, x + width, y,
                "rewind=1 matchbox={margin=-10 fillcolor={rgb 0.0 0.8 0.8}}");
            if (!result.equals("_stop")) {
                /* Check for errors or more text to be placed */
            }

            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.toString());
        }
        finally {
            if (p != null) {
                p.delete();
            }
        }
    }
}