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- 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__
-
-
- =head1 NAME
-
- GD::Barcode::EAN13 - Create EAN13(JAN13) barcode image with GD
-
- =head1 SYNOPSIS
-
- I<ex. CGI>
-
- use GD::Barcode::EAN13;
- binmode(STDOUT);
- print "Content-Type: image/png\n\n";
- print GD::Barcode::EAN13->new('123456789012')->plot->png;
-
- I<with Error Check>
-
- my $oGdBar = GD::Barcode::EAN13->new('123456789');
- die $GD::Barcode::EAN13::errStr unless($oGdBar); #Invalid Length
-
-
- =head1 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".
-
- =head2 new
-
- I<$oGdBar> = GD::Barcode::EAN13->new(I<$sTxt>);
-
- Constructor.
- Creates a GD::Barcode::EAN13 object for I<$sTxt>.
- I<$sTxt> has 12 or 13 numeric characters([0-9]).
- If I<$sTxt> has 12 characters, this module calacurates CD for you.
-
- =head2 plot()
-
- I<$oGd> = $oGdBar->plot([Height => I<$iHeight>, NoText => I<0 | 1>]);
-
- creates GD object with barcode image for the I<$sTxt> specified at L<new> method.
- I<$iHeight> is height of the image. If I<NoText> is 1, the image has no text image of I<$sTxt>.
-
- ex.
- my $oGdB = GD::Barcode::EAN13->new('123456789012');
- my $oGD = $oGdB->plot(NoText=>1, Height => 20);
- # $sGD is a GD image with Height=>20 pixels, with no text.
-
- =head2 barcode()
-
- I<$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 = '';
-
- =head2 $errStr
-
- $GD::Barcode::EAN13::errStr
-
- has error message.
-
- =head2 $text
-
- $oGdBar->{$text}
-
- has barcode text based on I<$sTxt> specified in L<new> method.
-
- =head1 AUTHOR
-
- Kawai Takanori GCD00051@nifty.ne.jp
-
- =head1 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.
-
- =head1 SEE ALSO
-
- GD::Barcode
-
- =cut
-