pdf_import/clone_page_boxes

 * Clone page boxes:

 * Import a PDF page, and clone all of its ArtBox, TrimBox, BleedBox, CropBox,

 * and MediaBox entries.

 *

 * Import a PDF page and read the respective *Box entries with pCOS. Start the

 * output page and replicate the *Box entries by using the corresponding *box

 * options of begin_page_ext(). Then, place the imported page in the lower left

 * corner of the CropBox if present, and the MediaBox otherwise.

 *

 * Note: You can visualize the page boxes in Acrobat 8 as follows:

 * Choose "Edit, Preferences, General, Page Display, Page Content and

 * Information" and select "Show art, trim & bleed boxes".

 * This setting will create colorized rectangles which indicate the size of the

 * art, trim, and bleed boxes.

 *

 * Required software: PDFlib+PDI/PPS 7

 * Required data: PDF document

 */

package com.pdflib.cookbook.pdflib.pdf_import;

import com.pdflib.pdflib;

import com.pdflib.PDFlibException;

public class clone_page_boxes

{

    public static void main (String argv[])

    {

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

    String searchpath = "../input";

    String outfile = "clone_page_boxes.pdf";

    String title = "Clone Page Boxes";

    pdflib p = null;

    String pdffile = "pageboxes.pdf";

    String optlist;

    int indoc, pageno, endpage, page;

    boolean have_cropbox = false;

    double[] artbox, bleedbox, cropbox, mediabox, trimbox;

    artbox = new double[4];

    bleedbox = new double[4];

    cropbox = new double[4];

    mediabox = new double[4];

    trimbox = new double[4];

    try {

        p = new pdflib();

        p.set_parameter("SearchPath", searchpath);

        /* This means we must check return values of load_font() etc. */

        p.set_parameter("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: 1.3 $");

        /* Open the input PDF */

        indoc = p.open_pdi_document(pdffile, "");

        if (indoc == -1)

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

        endpage = (int) p.pcos_get_number(indoc, "length:pages");

        /* Loop over all pages of the input document */

        for (pageno = 1; pageno <= endpage; pageno++)

        {

            /* The "pdiusebox" option can be used to specify the box dimensions

             * to be used for determining the imported page’s size. By default,

             * the dimensions of the CropBox will be used if present and the

             * MediaBox otherwise.

             */

            page = p.open_pdi_page(indoc, pageno, "");

            if (page == -1)

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

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

             * Retrieve the *Box coordinates from the input page and use them

             * to assemble the option list for starting the output page

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

             */

            optlist = "";

            have_cropbox = false;

            /* If the ArtBox is present on the page retrieve its four

             * coordinates and add them to the option list

             */

            if (!p.pcos_get_string(indoc,

                "type:pages[" + (pageno-1) + "]/ArtBox").equals("null"))

            {

                optlist = optlist + "artbox={";

                for (int i = 0; i < 4; i++)

                {

                    artbox[i] = p.pcos_get_number(indoc,

                        "pages[" + (pageno-1) + "]/ArtBox[" + i + "]");

                    optlist = optlist + artbox[i] + " ";

                }

                optlist = optlist + "} ";

            }

            /* If the BleedBox is present on the page retrieve its four

             * coordinates and add them to the option list

             */

            if (!p.pcos_get_string(indoc,

                "type:pages[" + (pageno-1) + "]/BleedBox").equals("null"))

            {

                optlist = optlist + "bleedbox={";

                for (int i = 0; i < 4; i++)

                {

                    bleedbox[i] = p.pcos_get_number(indoc,

                        "pages[" + (pageno-1) + "]/BleedBox[" + i + "]");

                    optlist = optlist + bleedbox[i] + " ";

                }

                optlist = optlist + "} ";

            }

            /* If the CropBox is present on the page retrieve its four

             * coordinates and add them to the option list

             */

            if (!p.pcos_get_string(indoc,

                "type:pages[" + (pageno-1) + "]/CropBox").equals("null"))

            {

                optlist = optlist + "cropbox={";

                for (int i = 0; i < 4; i++)

                {

                    cropbox[i] = p.pcos_get_number(indoc,

                        "pages[" + (pageno-1) + "]/CropBox[" + i + "]");

                    optlist = optlist + cropbox[i] + " ";

                }

                optlist = optlist + "} ";

                have_cropbox = true;

            }

            /* Retrieve the coordinates of the MediaBox and add them to the

             * option list. Since the MediaBox is always present on the page no

             * check is needed.

             */

            optlist = optlist + "mediabox={";

            for (int i = 0; i < 4; i++)

            {

                mediabox[i] = p.pcos_get_number(indoc,

                    "pages[" + (pageno-1) + "]/MediaBox[" + i + "]");

                optlist = optlist + mediabox[i] + " ";

            }

            optlist = optlist + "} ";

            /* If the TrimBox is present on the page retrieve its four

             * coordinates and add them to the option list

             */

            if (!p.pcos_get_string(indoc,

                "type:pages[" + (pageno-1) + "]/TrimBox").equals("null"))

            {

                optlist = optlist + "trimbox={";

                for (int i = 0; i < 4; i++)

                {

                    trimbox[i] = p.pcos_get_number(indoc,

                        "pages[" + (pageno-1) + "]/TrimBox[" + i + "]");

                    optlist = optlist + trimbox[i] + " ";

                }

                optlist = optlist + "} ";

            }

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

             * Start and place the page. Zero width and height will be

             * overridden by the "mediabox" option.

             * PDFlib places the imported page at (0, 0) of the "visible" page,

             * which is determined by the CropBox if present, and the MediaBox

             * otherwise. The imported page must therefore be placed in the

             * lower left corner of the relevant box.

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

             */

            p.begin_page_ext(0, 0, optlist);

            if (have_cropbox)

                p.fit_pdi_page(page, cropbox[0], cropbox[1], "");

            else

                p.fit_pdi_page(page, mediabox[0], mediabox[1], "");

            p.end_page_ext("");

            p.close_pdi_page(page);

        }

        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();

            }

        }

    }

}