pdf_import/clip_imported_page
Clip imported PDF page.
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/*
* Clip imported PDF page:
*
* Use the "matchbox" option with the "clipping" suboption to place some
* part of an imported PDF page. The following variants are demonstrated:
* - clip a rectangular area of the page and place it in its original scaling.
* - clip a rectangular area of the page and force-fit into a box with
* specified size.
*
* Required software: PDFlib+PDI/PPS 9
* Required data: input PDF
*/
package com.pdflib.cookbook.pdflib.pdf_import;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
public class clip_imported_page {
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 = "clip_imported_page.pdf";
String title = "Clip imported page";
pdflib p = null;
int exitcode = 0;
String pdffile = "lionel.pdf";
try {
int doc, page, gstate, font;
String clipping_optlist, text;
int llx = 50, lly = 550;
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);
/* Load page of the input PDF document */
doc = p.open_pdi_document(pdffile, "");
if (doc == -1)
throw new Exception("Error: " + p.get_errmsg());
page = p.open_pdi_page(doc, 1, "");
if (page == -1)
throw new Exception("Error: " + p.get_errmsg());
font = p.load_font("NotoSerif-Regular", "unicode", "");
if (font == -1)
throw new Exception("Error: " + p.get_errmsg());
/* --------------------------------------------------------
* Output the original page with transparency as background
* --------------------------------------------------------
*/
p.begin_page_ext(0, 0, "width=a4.height height=a4.width");
p.setfont(font, 10);
/* Output some descriptive text */
text = "Place the full PDF page in its original size with transparency (for comparison)";
p.fit_textline(text, llx, 520, "");
/* Create an extended graphics state with transparency */
gstate = p.create_gstate("opacityfill=.4");
/* Fit the PDF page in its original size with the transparency gstate */
p.fit_pdi_page(page, llx, lly-=500, "gstate=" + gstate);
/* ----------------------------------------------
* Place the clipped page in its original size
* ----------------------------------------------
*/
/* Define a rectangular part of the PDF page with the "matchbox" option
* and the "clipping" suboption to set the lower left and upper right
* corners of the clipping rectangle.
*/
int c_llx = 100, c_lly = 100, c_urx = 350, c_ury = 375;
clipping_optlist = "matchbox={clipping={" +
c_llx + " " + c_lly + " " + c_urx + " " + c_ury + "}}";
/* Output some descriptive text */
text = "Place the clipped PDF page in its original size:";
p.fit_textline(text, llx, 505, "");
text = "p.fit_pdi_page(page, " + (llx + c_llx) + " , " + (lly + c_lly) +
", \"" + clipping_optlist + "\");";
p.fit_textline(text, llx, 490, "");
/* Display the clipped area at the same position where it would
* appear when displaying the complete PDF page.
*/
p.fit_pdi_page(page, llx + c_llx, lly + c_lly, clipping_optlist);
p.end_page_ext("");
/* -----------------------------------------------------
* Display the clipped area in a box with specified size
* -----------------------------------------------------
*/
p.begin_page_ext(0, 0, "width=a4.height height=a4.width");
p.setfont(font, 10);
lly = 550;
/* Define a rectangular part of the PDF page with the "matchbox" option
* and the "clipping" suboption. The lower left and upper right corners
* of the rectangle are specified as percentages of the original PDF page size.
*/
clipping_optlist = "matchbox={clipping={35% 35% 75% 75%}}";
text = "Place the clipped area in its original size:";
p.fit_textline(text, llx, lly-=30, "");
text = "p.fit_pdi_page(page, x, y, \"" + clipping_optlist + "\");";
p.fit_textline(text, llx, lly-=15, "");
/* Place the clipped PDF page */
p.fit_pdi_page(page, llx, lly-=220, clipping_optlist);
/* Display the clipped PDF page in a box of the specified size. Scale the
* clipped PDF page proportionally so that it fits into the specified box
* with "fitmethod=meet".
*/
clipping_optlist = "matchbox={clipping={35% 35% 75% 75%}} " +
"boxsize={200 100} fitmethod=meet showborder";
/* Output some descriptive text */
text = "Place the clipped area in a specified box:";
p.fit_textline(text, llx, lly-=50, "");
text = "p.fit_pdi_page(page, x, y, \"" + clipping_optlist + "\");";
p.fit_textline(text, llx, lly-=15, "");
p.fit_pdi_page(page, llx, lly-=120, clipping_optlist);
p.end_page_ext("");
p.close_pdi_page(page);
p.close_pdi_document(doc);
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);
}
}
}