GD::Barcode - Create barcode image with GD

       Kawai Takanori GCD00051@nifty.ne.jp

       The GD::Barocde 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.

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

       From 1.14, you can use this module even if no GD (except plot method).

   new$oGdBar = GD::Barcode::UPCE->new($sType, $sTxt);

       Constructor.  Creates a GD::Barcode::$sType object for $sTxt.

   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->new('EAN13', '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' and '0'.  '1' means black, '0' means white.

        ex.
         my $oGdB = GD::Barcode->new('UPCE', '123456789012');
         my $sPtn = $oGdB->barcode();
         # $sPtn = '';

   $errStr
       $GD::Barcode::errStr

       has error message.

   $text
       $oGdBar->{$text}

       has barcode text based on $sTxt specified in "new" method.

       GD::Barcode - Create barcode image with GD

       GD GD::Barcode subclasses

perl v5.36.0                                       2023-11-03                                   GD::Barcode(3pm)

ex.CGI

         use GD::Barcode::UPCE;
         binmode(STDOUT);
         print "Content-Type: image/png\n\n";
         print GD::Barcode->new('EAN13', '123456789012')->plot->png;

       withErrorCheck

         my $oGdBar = GD::Barcode->new('EAN13', '12345678901');
         die $GD::Barcode::errStr unless($oGdBar);     #Invalid Length
         $oGdBar->plot->png;