GD::Barcode::Code39 - Create Code39 barcode image with GD
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NAME
GD::Barcode::Code39 - Create Code39 barcode image with GD
SYNOPSIS
ex. CGI
use GD::Barcode::Code39;
binmode(STDOUT);
print "Content-Type: image/png\n\n";
print GD::Barcode::Code39->new('*CODE39IMG*')->plot->png;
with Error Check
my $oGdBar = GD::Barcode::Code39->new('*123456789;*');
die $GD::Barcode::Code39::errStr unless($oGdBar); #Invalid Characters
DESCRIPTION
GD::Barcode::Code39 is a subclass of GD::Barcode and allows you to
create CODE-39 barcode image with GD.
This module based on "Generate Barcode Ver 1.02 By Shisei Hanai 97/08/22".
new
$oGdBar = GD::Barcode::Code39->new($sTxt);
Constructor.
Creates a GD::Barcode::Code39 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::Code39->new('*12345*');
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::Code39->new('*12345*');
my $sPtn = $oGdB->barcode();
# $sPtn = '';
$errStr
$GD::Barcode::Code39::errStr
has error message.
$text
$oGdBar->{text}
has barcode text based on $sTxt specified in new method.
AUTHOR
Kawai Takanori GCD00051@nifty.ne.jp
COPYRIGHT
The GD::Barocde::Code39 module is Copyright (c) 2000 Kawai Takanori. Japan.
All rights reserved.
You may distribute under the terms of either the GNU General Public
License or the Artistic License, as specified in the Perl README file.
SEE ALSO
package GD::Barcode::Code39;
use strict;
#use GD;
BEGIN { eval{require 'GD.pm';}; };
use GD::Barcode;
require Exporter;
use vars qw($VERSION @ISA $errStr);
@ISA = qw(GD::Barcode Exporter);
$VERSION=1.10;
my $code39Bar = {
'0' => '000110100',
'1' => '100100001',
'2' => '001100001',
'3' => '101100000',
'4' => '000110001',
'5' => '100110000',
'6' => '001110000',
'7' => '000100101',
'8' => '100100100',
'9' => '001100100',
'A' => '100001001',
'B' => '001001001',
'C' => '101001000',
'D' => '000011001',
'E' => '100011000',
'F' => '001011000',
'G' => '000001101',
'H' => '100001100',
'I' => '001001100',
'J' => '000011100',
'K' => '100000011',
'L' => '001000011',
'M' => '101000010',
'N' => '000010011',
'O' => '100010010',
'P' => '001010010',
'Q' => '000000111',
'R' => '100000110',
'S' => '001000110',
'T' => '000010110',
'U' => '110000001',
'V' => '011000001',
'W' => '111000000',
'X' => '010010001',
'Y' => '110010000',
'Z' => '011010000',
'-' => '010000101',
'*' => '010010100',
'+' => '010001010',
'$' => '010101000',
'%' => '000101010',
'/' => '010100010',
'.' => '110000100',
' ' => '011000100'
};
#------------------------------------------------------------------------------
# new (for GD::Barcode::Code39)
#------------------------------------------------------------------------------
sub new($$) {
my($sClass, $sTxt) = @_;
$errStr ='';
my $oThis = {};
bless $oThis;
return undef if($errStr = $oThis->init($sTxt));
return $oThis;
}
#------------------------------------------------------------------------------
# init (for GD::Barcode::Code39)
#------------------------------------------------------------------------------
sub init($$){
my($oThis, $sTxt) =@_;
#Check
return 'Invalid Characters' if($sTxt =~ /[^0-9A-Z\-*+\$%\/. ]/);
$oThis->{text} = $sTxt;
return '';
}
#------------------------------------------------------------------------------
# barcode (for GD::Barcode::Code39)
#------------------------------------------------------------------------------
sub barcode($) {
my($oThis) = @_;
my($sTxt);
my($sWk, $sRes);
# $sTxt = '*'. $oThis->{text} . '*';
$sTxt = $oThis->{text};
$sRes = '';
foreach $sWk (split(//, $sTxt)) {
$sRes .= GD::Barcode::dumpCode( $code39Bar->{$sWk} .'0' );
}
return $sRes;
}
#------------------------------------------------------------------------------
# plot (for GD::Barcode::Code39)
#------------------------------------------------------------------------------
sub plot($;%) {
my($oThis, %hParam) = @_;
#Barcode Pattern
# my $sTxtWk = '*' . $oThis->{text} . '*';
my $sTxtWk = $oThis->{text};
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);
#Bar Image
($oGd, $cBlack) = GD::Barcode::plot($sPtn, $iWidth, $iHeight, $fH, 0);
#String
$oGd->string(GD::Font->Small, (length($sPtn)-$fW*(length($sTxtWk)))/2, $iHeight - $fH,
$sTxtWk, $cBlack);
}
return $oGd;
}
1;
__END__