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Edit File: EAN8.pm

package GD::Barcode::EAN8;
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 $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';
#------------------------------------------------------------------------------
# new (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub new($$) {
  my($sClass, $sTxt) = @_;
  $errStr ='';
  my $oThis = {};
  bless $oThis;
  return undef if($errStr = $oThis->init($sTxt));
  return $oThis;
}
#------------------------------------------------------------------------------
# init (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub init($$){
        my($oThis, $sTxt) =@_;
#Check
    return 'Invalid Characters' if($sTxt =~ /[^0-9]/);

#CalcCd
        if( length($sTxt) == 7 ) {
                $sTxt .= calcEAN8CD( $sTxt ) ;
        }
        elsif(length($sTxt) == 8) {
                ;
        }
        else {
                return 'Invalid Length';
        }
        $oThis->{text} = $sTxt;
        return '';
}
#------------------------------------------------------------------------------
# calcEAN8CD (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub calcEAN8CD($) {
  my( $sTxt ) = @_;
  my( $i, $iSum);

my @aWeight = (3, 1, 3, 1, 3, 1, 3);
  $iSum = 0;
  for( $i = 0; $i < 7; $i++ ){
      $iSum += substr($sTxt, $i, 1)  * $aWeight[$i];
  }
  $iSum %= 10;
  $iSum = ($iSum == 0)? 0: (10 - $iSum);
  return "$iSum";
}
#------------------------------------------------------------------------------
# new (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub barcode($) {
    my ($oThis) = @_;
    my($i, $sRes);
#(1) Init
  my $sTxt = $oThis->{text};
  $sRes = $guardBar;            #GUARD

#(2) Left 4
  for( $i = 0; $i < 4; $i++ ) {
      $sRes .= GD::Barcode::barPtn( substr($sTxt, $i, 1), $leftOddBar );
  }

#(3) Center
  $sRes .= $centerBar;

#(4) Right 4 bytes
  for( $i = 4; $i < 8; $i++ ) {
    $sRes .= GD::Barcode::barPtn( substr($sTxt, $i, 1), $rightBar );
  }
#(5)GUARD
  $sRes .= $guardBar;
  return $sRes;
}
#------------------------------------------------------------------------------
# plot (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub plot($;%) {
  my($oThis, %hParam) =@_;

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);
#$      ($oGd, $cBlack) = GD::Barcode::plot($sPtn, $iWidth, $iHeight, $fH, $fW+1);
        ($oGd, $cBlack) = GD::Barcode::plot($sPtn, $iWidth, $iHeight, $fH, 0);
        $oGd->string(GD::Font->Small, $fW +  1, $iHeight - $fH, substr($oThis->{text}, 0, 4), $cBlack);
        $oGd->string(GD::Font->Small, $fW + 33, $iHeight - $fH, substr($oThis->{text}, 4, 4), $cBlack);
  }
  return $oGd;
}
1;
__END__

=head1 NAME

GD::Barcode::EAN8 - Create EAN8(JAN8) barcode image with GD

=head1 SYNOPSIS

I<ex. CGI>

use GD::Barcode::EAN8;
  binmode(STDOUT);
  print "Content-Type: image/png\n\n";
  print GD::Barcode::EAN8->new('1234567')->plot->png;

I<with Error Check>

my $oGdBar = GD::Barcode::EAN8->new('123456789');
  die $GD::Barcode::EAN8::errStr unless($oGdBar);       #Invalid Length

=head1 DESCRIPTION

GD::Barcode::EAN8 is a subclass of GD::Barcode and allows you to
create EAN8(JAN8) barcode image with GD.
This module based on "Generate Barcode Ver 1.02 By Shisei Hanai 97/08/22".

=head2 new

I<$oGdBar> = GD::Barcode::EAN8->new(I<$sTxt>);

Constructor. 
Creates a GD::Barcode::EAN8 object for I<$sTxt>.
I<$sTxt> has 7 or 8 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::EAN8->new('1234567');
  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::EAN8->new('1234567');
  my $sPtn = $oGdB->barcode();
  # $sPtn = '';

=head2 $errStr

$GD::Barcode::EAN8::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

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