NAME

       GD::Barcode::UPCA - Create UPC-A barcode image with GD

SYNOPSIS

       ex. CGI

         use GD::Barcode::UPCA;
         binmode(STDOUT);
         print "Content-Type: image/png\n\n";
         print GD::Barcode::UPCA->new('12345678901')->plot->png;

       with Error Check

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

DESCRIPTION

       GD::Barcode::UPCA is a subclass of GD::Barcode and allows you to create UPC-A barcode
       image with GD.  This module based on "Generate Barcode Ver 1.02 By Shisei Hanai 97/08/22".

   new
       $oGdBar = GD::Barcode::UPCA->new($sTxt);

       Constructor.  Creates a GD::Barcode::UPCA object for $sTxt.  $sTxt has 11 or 12 numeric
       characters([0-9]).  If $sTxt has 11 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::UPCA->new('12345678901');
         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::UPCA->new('12345678901');
         my $sPtn = $oGdB->barcode();
         # $sPtn = '';

   $errStr
       $GD::Barcode::UPCA::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::UPCA 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

       GD::Barcode