graphics/overprinting_text

<?php

/* $Id: overprinting_text.php,v 1.2 2012/05/03 14:00:37 stm Exp $

 * Overprinting text:

 * Create text which will overprint other page contents instead of knocking

 * it out

 *

 * Create an extended graphics state with the options

 * "overprintfill=true overprintmode=1".

 *

 * Required software: PDFlib Lite/PDFlib/PDFlib+PDI/PPS 7

 * Required data: none

 */

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

$searchpath = dirname(dirname(dirname(__FILE__)))."/input";

$outfile = "";

$title = "Overprinting Text";

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");

    $p->set_parameter("textformat", "utf8");

    if ($p->begin_document($outfile, "") == 0)

        throw new Exception("Error: " . $p->get_errmsg());

    $p->set_info("Creator", "PDFlib Cookbook");

    $p->set_info("Title", $title );

   

    /* Load the font; for PDFlib Lite: change "unicode" to "winansi" */

    $font = $p->load_font("Helvetica-Bold", "unicode", "");

    if ($font == 0)

        throw new Exception("Error: " . $p->get_errmsg());

    /* Start page */

    $p->begin_page_ext(400, 300, "");

   

    /* Draw a red background rectangle */

    $p->setcolor("fill", "cmyk", 0, 1, 1, 0);

    $p->rect(0, 0, 400, 300);

    $p->fill();

   

    /* Save the current graphics state */

    $p->save();

   

    /* Create an extended graphics state */

    $gstate = $p->create_gstate("overprintfill overprintmode=1");

   

    /* Apply the extended graphics state */

    $p->set_gstate($gstate);

   

    /* Show some text which will overprint other page contents according to

     * the graphics state set

     */

    $p->setfont($font, 36);

    $p->setcolor("fill", "cmyk", 0, 0, 0, 1);

    $p->set_text_pos(20, 200);

    $p->show("overprinting text");

   

    /* Restore the current graphics state */

    $p->restore();

          

    /* Show some text. It will not be overprinting since the old graphics

     * state has been restored with no overprinting set.

     */

    $p->setfont($font, 36);

    $p->setcolor("fill", "cmyk", 0, 0, 0, 1);

    $p->set_text_pos(20, 100);

    $p->show("text not overprinting");

   

    $p->end_page_ext("");

    $p->end_document("");

    $buf = $p->get_buffer();

    $len = strlen($buf);

    header("Content-type: application/pdf");

    header("Content-Length: $len");

    header("Content-Disposition: inline; filename=overprinting_text.pdf");

    print $buf;

} catch (PDFlibException $e){

    die("PDFlib exception occurred:\n" .

        "[" . $e->get_errnum() . "] " . $e->get_apiname() .

        ": " . $e->get_errmsg() . "\n");

} catch (Exception $e) {

    die($e->getMessage());

}

$p=0;

?>