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images/display_image_partially

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/* $Id: display_image_partially.java,v 1.6 2014/01/30 14:05:25 rjs Exp $

 * Display image partially:

 * Display an image partially.

 *

 * Use the "matchbox" option with the "clipping" suboption to define a

 * rectangular part of the image.

 * Output the image part in its original size.

 * Output the image part by fitting it in a box of a given size.

 *

 * 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 display_image_partially

{

    public static void main (String argv[])

    {

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

        String searchpath = "../input";

        String outfile = "display_image_partially.pdf";

        String title = "Display Image Partially";


        pdflib p = null;

        int exitcode = 0;

        String imagefile = "nesrin.jpg";

        int image, gstate, font;

        String optlist, text;

        int llx = 50, lly = 550;

       

        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: 1.6 $");


            /* Load the image */

            image = p.load_image("auto", imagefile, "");

            if (image == -1)

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

            

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

            if (font == -1)

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

            

            /* Start page 1 */

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

            

            p.setfont(font, 12);

            

       

            /* -------------------------------------------------------------

             * Output the complete image in its original size with a certain

             * transparency as a kind of background image

             * -------------------------------------------------------------

             */

            

            /* Output some descriptive text */

            text = "Page 1:";

            p.fit_textline(text, llx, lly, "");

            text = "Place the full image in its original size, with a " +

                   "transparency of 50%";

            p.fit_textline(text, llx, lly-=30, "");

            

            /* Save the current graphics state */

            p.save();

            

            /* Create an extended graphics state with a transparency set to 50% */

            gstate = p.create_gstate("opacityfill=.4");

            

            /* Apply the extended graphics state */

            p.set_gstate(gstate);

            

            /* Fit the image in its original size with the transparency set above */

            p.fit_image(image, llx, lly-=500, "");

            

            /* Restore the original graphics state */

            p.restore();

            

            

            /* ----------------------------------------------

             * Place a part of the image in its original size

             * ----------------------------------------------

             */

            

            /* Define a rectangular part of the image by using the "matchbox" option

             * with the "clipping" suboption to set the lower left and upper right

             * corners of the rectangle.

             */

            int c_llx = 350, c_lly = 180, c_urx = 550, c_ury = 360;

            

            optlist = "matchbox={clipping={" +

                c_llx + " " + c_lly + " " + c_urx + " " + c_ury + "}}";

            

            /* Output some descriptive text */

            text = "Place a part of the image in its original size at the";

            p.fit_textline(text, llx + c_llx, 410, "");

            

            text = "position as it would appear in the full image";

            p.fit_textline(text, llx + c_llx, 395, "");

                      

            /* Display the image partially at the same position as it would appear

             * when displaying the complete image above.

             */

            p.fit_image(image, llx + c_llx, lly + c_lly, optlist);

            

            /* Output some descriptive text */

            text = "Place a part of the image in its original size";

            p.fit_textline(text, llx, 230, "");

            

            text = "at the lower left corner of the full image";

            p.fit_textline(text, llx, 215, "");

            

            /* Now, display the part of the image at the lower left corner of the

             * complete image above.

             */

            p.fit_image(image, llx, lly, optlist);

            

            p.end_page_ext("");

                  

            /* Start Page 2 */

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

            

            p.setfont(font, 12);

            

                  

            /* ----------------------------------------------------

             * Display the image partially in a box of a given size

             * ----------------------------------------------------

             */

            lly = 550;

            /* Output some descriptive text */

            p.fit_textline("Page 2:", llx, lly, "");

            

            text = "Output a part of the image in its original size:";

            p.fit_textline(text, llx, lly-=30, "");

            

            text = "p.fit_image(image, x, y, \"matchbox={clipping={35% 35% 75% " +

                   "75%}}\");";

            p.fit_textline(text, llx, lly-=15, "");

                        

            /* Define a rectangular part of the image by using the "matchbox" option

             * with the "clipping" suboption. The lower left and upper right corners

             * of the rectangle are set as percentages of the original image size.

             */

            optlist = "matchbox={clipping={35% 35% 75% 75%}}";

            

            /* Place the part of the image defined */

            p.fit_image(image, llx, lly-=220, optlist);

            

            /* Output some descriptive text */

            text = "Place a part of the image in a given box:";

            p.fit_textline(text, llx, lly-=50, "");

            

            text = "p.fit_image(image, x, y, \"matchbox={clipping={35% 35% 75% " +

                   "75%}} boxsize={300 200} fitmethod=meet showborder\");";

            p.fit_textline(text, llx, lly-=15, "");

            

            /* Display the image partially in a box of the given size. Scale the

             * part of the image proportionally until it fits completely into the

             * box.

             */

            optlist = "matchbox={clipping={35% 35% 75% 75%}} " +

                "boxsize={200 100} fitmethod=meet showborder";

            

            p.fit_image(image, llx, lly-=120, optlist);

            

            p.end_page_ext("");

            

            p.close_image(image);


            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");

            exitcode = 1;

        } catch (Exception e) {

            System.err.println(e.getMessage());

            exitcode = 1;

        } finally {

            if (p != null) {

                p.delete();

            }

            System.exit(exitcode);

        }

    }

}