GD::Barcode::EAN13 - Create EAN13(JAN13) barcode image with GD
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NAME
GD::Barcode::EAN13 - Create EAN13(JAN13) barcode image with GD
SYNOPSIS
ex. CGI
use GD::Barcode::EAN13;
binmode(STDOUT);
print "Content-Type: image/png\n\n";
print GD::Barcode::EAN13->new('123456789012')->plot->png;
with Error Check
my $oGdBar = GD::Barcode::EAN13->new('123456789');
die $GD::Barcode::EAN13::errStr unless($oGdBar); #Invalid Length
DESCRIPTION
GD::Barcode::EAN13 is a subclass of GD::Barcode and allows you to
create EAN13(JAN13) barcode image with GD.
This module based on "Generate Barcode Ver 1.02 By Shisei Hanai 97/08/22".
new
$oGdBar = GD::Barcode::EAN13->new($sTxt);
Constructor.
Creates a GD::Barcode::EAN13 object for $sTxt.
$sTxt has 12 or 13 numeric characters([0-9]).
If $sTxt has 12 characters, this module calacurates CD for you.
plot()
$oGd = $oGdBar->plot([Height => $iHeight, NoText => 0 | 1]);
creates GD object with barcode image for the $sTxt specified at new method.
$iHeight is height of the image. If NoText is 1, the image has no text image of $sTxt.
ex.
my $oGdB = GD::Barcode::EAN13->new('123456789012');
my $oGD = $oGdB->plot(NoText=>1, Height => 20);
# $sGD is a GD image with Height=>20 pixels, with no text.
barcode()
$sPtn = $oGdBar->barcode();
returns a barcode pattern in string with '1', 'G' and '0'.
'1' means black, 'G' also means black but little bit long,
'0' means white.
ex.
my $oGdB = GD::Barcode::EAN13->new('123456789012');
my $sPtn = $oGdB->barcode();
# $sPtn = '';
$errStr
$GD::Barcode::EAN13::errStr
has error message.
$text
$oGdBar->{$text}
has barcode text based on $sTxt specified in new method.
AUTHOR
Kawai Takanori GCD00051@nifty.ne.jp
COPYRIGHT
The GD::Barocde::EAN13 module is Copyright (c) 2000 Kawai Takanori. Japan.
All rights reserved.
You may distribute under the terms of either the GNU General Public
License or the Artistic License, as specified in the Perl README file.
SEE ALSO
package GD::Barcode::EAN13;
use strict;
BEGIN { eval{require 'GD.pm';}; };
use GD::Barcode;
require Exporter;
use vars qw($VERSION @ISA $errStr);
@ISA = qw(GD::Barcode Exporter);
$VERSION=1.10;
my $leftOddBar ={
'0' => '0001101',
'1' => '0011001',
'2' => '0010011',
'3' => '0111101',
'4' => '0100011',
'5' => '0110001',
'6' => '0101111',
'7' => '0111011',
'8' => '0110111',
'9' => '0001011'
};
my $leftEvenBar = {
'0' => '0100111',
'1' => '0110011',
'2' => '0011011',
'3' => '0100001',
'4' => '0011101',
'5' => '0111001',
'6' => '0000101',
'7' => '0010001',
'8' => '0001001',
'9' => '0010111'
};
my $rightBar = {
'0' => '1110010',
'1' => '1100110',
'2' => '1101100',
'3' => '1000010',
'4' => '1011100',
'5' => '1001110',
'6' => '1010000',
'7' => '1000100',
'8' => '1001000',
'9' => '1110100'
};
my $guardBar = 'G0G';
my $centerBar = '0G0G0';
my $oddEven4EAN = {
0 => 'OOOOOO',
1 => 'OOEOEE',
2 => 'OOEEOE',
3 => 'OOEEEO',
4 => 'OEOOEE',
5 => 'OEEOOE',
6 => 'OEEEOO',
7 => 'OEOEOE',
8 => 'OEOEEO',
9 => 'OEEOEO'
};
#------------------------------------------------------------------------------
# new (for GD::Barcode::EAN13)
#------------------------------------------------------------------------------
sub new($$) {
my($sClass, $sTxt) = @_;
$errStr ='';
my $oThis = {};
bless $oThis;
return undef if($errStr = $oThis->init($sTxt));
return $oThis;
}
#------------------------------------------------------------------------------
# init (for GD::Barcode::EAN13)
#------------------------------------------------------------------------------
sub init($$){
my($oThis, $sTxt) =@_;
#Check
return 'Invalid Characters' if($sTxt =~ /[^0-9]/);
#CalcCd
if( length($sTxt) == 12 ) {
$sTxt .= calcEAN13CD( $sTxt ) ;
}
elsif(length($sTxt) == 13) {
;
}
else {
return 'Invalid Length';
}
$oThis->{text} = $sTxt;
return '';
}
#==================================================================
# Check digit for EAN13
#==================================================================
sub calcEAN13CD($) {
my( $sTxt ) =@_;
my( $i, $iSum);
my @aWeight = (1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3);
$iSum = 0;
for( $i = 0; $i < 12; $i++ ){
$iSum += substr($sTxt, $i, 1) * $aWeight[$i];
}
$iSum %= 10;
$iSum = ($iSum == 0)? 0: (10 - $iSum);
return "$iSum";
}
#------------------------------------------------------------------------------
# barcode (for GD::Barcode::EAN13)
#------------------------------------------------------------------------------
sub barcode($) {
my ($oThis) = @_;
my ($sTxt);
my ($oddEven, $i, $sBar);
my ($sRes);
#(1)Init
$sTxt = $oThis->{text};
$sRes = $guardBar; #GUARD
#(2)Left 7 letters
$oddEven = $oddEven4EAN->{substr($sTxt, 0, 1)};
for( $i = 1; $i < 7; $i++ ) {
$sBar = ( substr($oddEven, $i-1, 1) eq 'O')?
$leftOddBar : $leftEvenBar;
$sRes .= GD::Barcode::barPtn(
substr($sTxt, $i, 1), $sBar);
}
#(4)Center
$sRes .= $centerBar;
#(5)Right
for( $i = 7; $i < 13; $i++ ) {
$sRes .= GD::Barcode::barPtn( substr($sTxt, $i, 1), $rightBar );
}
#(6)GUARD
$sRes .= $guardBar;
return $sRes;
}
#------------------------------------------------------------------------------
# plot (for GD::Barcode::EAN13)
#------------------------------------------------------------------------------
sub plot($;%) {
my($oThis, %hParam) = @_;
#Barcode Pattern
my $sPtn = $oThis->barcode();
#Create Image
my $iHeight = ($hParam{Height})? $hParam{Height} : 50;
my($oGd, $cBlack);
if($hParam{NoText}) {
($oGd, $cBlack) = GD::Barcode::plot($sPtn, length($sPtn), $iHeight, 0, 0);
}
else {
my($fW,$fH) = (GD::Font->Small->width,GD::Font->Small->height);
my $iWidth = length($sPtn)+$fW+1;
($oGd, $cBlack) = GD::Barcode::plot($sPtn, $iWidth, $iHeight, $fH, $fW+1);
$oGd->string(GD::Font->Small, 0, $iHeight - $fH, substr($oThis->{text}, 0, 1), $cBlack);
$oGd->string(GD::Font->Small, $fW +8 , $iHeight - $fH, substr($oThis->{text}, 1, 6), $cBlack);
$oGd->string(GD::Font->Small, $fW +55, $iHeight - $fH, substr($oThis->{text}, 7, 6), $cBlack);
}
return $oGd;
}
1;
__END__