Perl Requires Chilkat v11.7.0+

Tile a Watermark Across a PDF Page

See more PDF Watermark Examples

Demonstrates a tiled watermark, which repeats the stamp over the whole page instead of placing it once. Tiling overrides position.align; tile.spacingX and spacingY set the gaps, and tile.stagger offsets alternate rows by half a tile so the pattern does not line up in columns. A faint tiled stamp carrying the name or address is the usual way to mark a document so that a leaked copy can be traced back, and zOrder back keeps it behind the text where it does not hinder reading. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# The PDF used in this example is available at long_report.pdf

my $pdf = Chilkat2::Pdf->new;
my $success = $pdf->LoadFile('qa_data/pdf/long_report.pdf');
if (!$success) {
    print $pdf->LastErrorText, "\n";
    exit;
}

my $json = Chilkat2::JsonObject->new;
$json->UpdateString('type', 'text');

# {date:FORMAT} is replaced per page when the watermark is added.  The other placeholders are
# {page}, {pages} and {filename}; {{ gives a literal brace.
$json->UpdateString('text', 'jdoe@example.com  {date:yyyy-MM-dd}');
$json->UpdateString('id', 'trace');
$json->UpdateString('zOrder', 'back');
$json->UpdateNumber('font.size', '14');
$json->UpdateNumber('opacity', '0.15');
$json->UpdateNumber('rotation', '30');

$json->UpdateBool('tile.enabled', 1);
$json->UpdateNumber('tile.spacingX', '60');
$json->UpdateNumber('tile.spacingY', '80');
$json->UpdateBool('tile.stagger', 1);

my $jsonOut = Chilkat2::JsonObject->new;
$success = $pdf->Watermark('add', $json, $jsonOut);
if (!$success) {
    print $pdf->LastErrorText, "\n";
    exit;
}

print 'id: ', $jsonOut->StringOf('id'), ' pages: ', $jsonOut->StringOf('pages'), "\n";

$success = $pdf->WriteFile('qa_output/report_traced.pdf');
if (!$success) {
    print $pdf->LastErrorText, "\n";
    exit;
}

# Sample output:

# id: trace pages: 1-3