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comp.lang.ruby

Eurionize - something PDF::Writer and PostScript libs might like

Daniel Berger

2/6/2009 7:52:00 PM

I came across this bit of Perl at:

http://wildsparx.com/...

In short it marks a postscript doc so that it can't be copied by most
color copiers.

Thought someone might want to port it for PDF::Writer or whatever.

Regards,

Dan

#!/usr/bin/perl
#
# Eurionize - add the so-called "EURion constellation" anti-copying
mark
# to a postscript document.
#
# Copyright 2004 Asher Blum - licensed under the GNU GPL.
# Based on research by Markus Kuhn - http://www.cl.cam.ac.uk/~mgk25/...
#
# Version 0.1

use strict;

undef $/;
my $doc = <>;
my $ps = ps();
$doc =~ s|([^/])showpage|$1ashershowpage|g;
$doc =~ s/%%BeginProlog/%%BeginProlog\n$ps/;
print $doc;

sub ps {
my $ps = <<EOT;

/zzdonut {
/angle exch def
/radius exch def
gsave
0.45 setlinewidth
1.417 1.417 scale
angle rotate
radius 0 0.72 0 360 arc stroke
grestore
} def

/zzconstellation {
1 1 0 setrgbcolor
0 0 zzdonut
7.8 0 zzdonut
7.2 72 zzdonut
4.8 168 zzdonut
4.9 249 zzdonut
} def

/ashershowpage {
gsave
matrix defaultmatrix setmatrix
1 1 5 {
pop
100 100 translate zzconstellation
} for
grestore
showpage
} def
EOT
$ps;
}