pdf_import/crop_imported_pages
Crop the pages of an existing PDF document.
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/*
* Crop imported pages:
* Crop pages of an existing PDF document
*
* Import a PDF page and reduce the page by some fixed amount before placing
* it in the output document. The retrieve the dimensions of the imported page
* and place it on a page size of 1/4 of the original size.
*
* Required software: PDFlib+PDI/PPS 9
* Required data: PDF document
*/
package com.pdflib.cookbook.pdflib.pdf_import;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
public class crop_imported_pages
{
public static void main (String argv[])
{
/* This is where the data files are. Adjust as necessary. */
String searchpath = "../input";
/* By default annotations are also imported. In some cases this
* requires the Noto fonts for creating annotation appearance streams.
* We therefore set the searchpath to also point to the font directory.
*/
String fontpath = "../resource/font";
String outfile = "crop_imported_pages.pdf";
String title = "Crop Imported Pages";
pdflib p = null;
String pdffile = "kraxi_business_cards.pdf";
int indoc, pageno, endpage, page;
int exitcode = 0;
try {
p = new pdflib();
p.set_option("searchpath={" + searchpath + "}");
p.set_option("searchpath={" + fontpath + "}");
/* 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);
/* 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++)
{
page = p.open_pdi_page(indoc, pageno, "");
if (page == -1)
throw new Exception("Error: " + p.get_errmsg());
/* Page size may be adjusted by fit_pdi_page().*/
p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
/* Place the imported page without performing
* any changes on the output page
*/
p.fit_pdi_page(page, 0, 0, "adjustpage");
p.end_page_ext("");
/* Page size may be adjusted by fit_pdi_page().*/
p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
/* Place the imported page, adjust the page size
* to the size of the imported page, and crop the page by 51.
*/
p.fit_pdi_page(page, -51, -51, "adjustpage");
p.end_page_ext("");
/* Retrieve the dimensions of the imported page and adjust the page
* size by cropping it to a certain percentage of the imported page
* size.
*/
/* Retrieve the width and height of the current page (note that
* indices for the pages pseudo object start at 0):
*/
double pagewidth =
p.pcos_get_number(indoc, "pages[" + (pageno - 1) + "]/width");
double pageheight =
p.pcos_get_number(indoc, "pages[" + (pageno - 1) + "]/height");
/* Set the new page size to 1/4 of the imported page size */
p.begin_page_ext(pagewidth/4, pageheight/4, "");
/* Place the imported page and scale it to 1/4 of its page size */
p.fit_pdi_page(page, 0, 0, "boxsize={" + pagewidth/4 + " " +
pageheight/4 + "} fitmethod=meet");
p.end_page_ext("");
p.close_pdi_page(page);
}
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);
}
}
}