NAME

       GD::Barcode::NW7 - Create NW7 barcode image with GD

SYNOPSIS

       ex. CGI

         use GD::Barcode::NW7;
         binmode(STDOUT);
         print "Content-Type: image/png\n\n";
         print GD::Barcode::NW7->new('123456789012')->plot->png;

       with Error Check

         my $oGdBar = GD::Barcode::NW7->new('123456789E');
         die $GD::Barcode::NW7::errStr unless($oGdBar);        #Invalid Characters

DESCRIPTION

       GD::Barcode::NW7 is a subclass of GD::Barcode and allows you to create NW7 barcode image
       with GD.  This module based on "Generate Barcode Ver 1.02 By Shisei Hanai 97/08/22".

   new
       $oGdBar = GD::Barcode::NW7->new($sTxt);

       Constructor.  Creates a GD::Barcode::NW7 object for $sTxt.  $sTxt has variable length
       string with (0-9, - $ / . + ABCD).

   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::NW7->new('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::NW7->new('123456789012');
         my $sPtn = $oGdB->barcode();
         # $sPtn = '';

   $errStr
       $GD::Barcode::NW7::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::NW7 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