PDFlib Cookbook

cookbook

pagination/crop_page

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/* $Id: crop_page.java,v 1.4 2013/01/15 10:12:01 stm Exp $
 * Crop page:
 * Crop an A4 page to an A5 page
 *
 * Create a page with A4 format and Portrait orientation and crop it to an A5 page.
 * Open the A5 page with the same zoom as chosen for the A4 page to fit completely
 * into the window.
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: image file
 */
package com.pdflib.cookbook.pdflib.pagination;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

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

    pdflib p = null;
    String optlist;
    int font, action;
 
    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: 1.4 $");

        font = p.load_font("Helvetica-Bold", "unicode", "");
        if (font == -1)
            throw new Exception("Error: " + p.get_errmsg());
        

        /* ----------------------------------
         * Create the first page in A4 format
         * ----------------------------------
         */
        p.begin_page_ext(595, 842, "");
        
        /* Draw a violet rectangle in A5 format */
        p.setcolor("fill", "rgb", 0.7, 0, 0.6, 0);
        p.rect(87, 123, 421, 595);
        p.fill();
        
        /* Output some explanatory text */
        p.fit_textline("A4 page uncropped", 50, 50, 
            "font=" + font + " fontsize=20  fillcolor={gray 0}");
        
        /* Create a "GoTo" action for opening the current page (page=0) with
         * a zoom to completely fit it into the window (type=fitwindow) 
         */
        optlist = "destination={page=0 type=fitwindow}";
        action = p.create_action("GoTo", optlist);
        
        /* Finish the page with the "GoTo" action being applied. When the page
         * is opened in the viewer it will completely fit into the window.
         */
        p.end_page_ext("action={open=" + action + "}");
        
        
        /* -------------------------------------------------------------
        /* Create the second page in A4 format and crop it to an A5 page
         * -------------------------------------------------------------
         */
        p.begin_page_ext(595, 842, "");
        
        /* Draw a violet rectangle in A5 format */
        p.setcolor("fill", "rgb", 0.7, 0, 0.6, 0);
        p.rect(87, 123, 421, 595);
        p.fill();
        
        /* Output some explanatory text */
        p.fit_textline("A4 page cropped to A5", 95, 140, 
            "font=" + font + " fontsize=20 fillcolor={gray 0}");
        
        /* Create a "GoTo" action for opening the current page with the same
         * zoom as chosen for the A4 page. This is accomplished by supplying
         * the size of the A4 page as the rectangle to completely fit into
         * the window.
         */
        optlist = "destination={page=0 type=fitrect left=0 bottom=0 " +
            "right=595 top=842}";
        action = p.create_action("GoTo", optlist);
        
        /* Finish the page and crop it to the A5 format. In addition, the
         * "GoTo" action is applied. When the page is opened in the viewer it
         * will be displayed with the same zoom as the A4 page.
         */
        p.end_page_ext("cropbox={87 123 508 718} action={open=" + action + "}");
        
        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();
            }
        }
    }
}