NAME
    GD::Barcode - Create barcode images with GD

SYNOPSIS
    *ex. CGI*

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

    *with Error Check*

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

DESCRIPTION
    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', '123456');
      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.

AUTHOR
    Kawai Takanori GCD00051@nifty.ne.jp

COPYRIGHT
    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.

SEE ALSO
    GD GD::Barcode subclasses