GD::Barcode::ITF - Create ITF(Interleaved2of5) barcode image with GD
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NAME
GD::Barcode::ITF - Create ITF(Interleaved2of5) barcode image with GD
SYNOPSIS
ex. CGI
use GD::Barcode::ITF;
binmode(STDOUT);
print "Content-Type: image/png\n\n";
print GD::Barcode::ITF->new('1234567890')->plot->png;
with Error Check
my $oGdBar = GD::Barcode::ITF->new('A12345678');
die $GD::Barcode::ITF::errStr unless($oGdBar); #Invalid Characters
$oGdBar->plot->png;
DESCRIPTION
GD::Barcode::ITF is a subclass of GD::Barcode and allows you to
create ITF barcode image with GD.
new
$oGdBar = GD::Barcode::ITF->new($sTxt);
Constructor.
Creates a GD::Barcode::ITF object for $sTxt.
$sTxt has numeric characters([0-9]).
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::ITF->new('12345678');
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::ITF->new('12345678');
my $sPtn = $oGdB->barcode();
$errStr
$GD::Barcode::ITF::errStr
has error message.
$text
$oGdBar->{$text}
has barcode text based on $sTxt specified in new method.
AUTHOR
Kawai Takanori GCD00051@nifty.ne.jp
COPYRIGHT
The GD::Barocde::ITF module is Copyright (c) 2000 Kawai Takanori. Japan.
All rights reserved.
You may distribute under the terms of either the GNU General Public
License or the Artistic License, as specified in the Perl README file.
SEE ALSO
package GD::Barcode::ITF;
use strict;
BEGIN { eval{require 'GD.pm';}; };
use GD::Barcode;
require Exporter;
use vars qw($VERSION @ISA $errStr);
@ISA = qw(GD::Barcode Exporter);
$VERSION=0.01;
#------------------------------------------------------------------------------
# new (for GD::Barcode::ITF)
#------------------------------------------------------------------------------
sub new($$) {
my($sClass, $sTxt) = @_;
$errStr ='';
my $oThis = {};
bless $oThis;
return undef if($errStr = $oThis->init($sTxt));
return $oThis;
}
#------------------------------------------------------------------------------
# init (for GD::Barcode::ITF)
#------------------------------------------------------------------------------
sub init($$){
my($oThis, $sTxt) =@_;
#Check
return 'Invalid Characters' if($sTxt =~ /[^0-9]/);
#Not Set Chec
if( length($sTxt) %2 ) {
$sTxt .= calcITFCD($sTxt)
}
$oThis->{text} = $sTxt;
return '';
}
#------------------------------------------------------------------------------
# calcITFCD (for GD::Barcode::ITF)
#------------------------------------------------------------------------------
sub calcITFCD($) {
my( $sTxt ) = @_;
my( $i, $iSum);
$iSum = 0;
for( $i = 0; $i < length($sTxt); $i++ ){
$iSum += substr($sTxt, $i, 1) * (($i%2)? 1: 3);
}
$iSum %= 10;
$iSum = ($iSum == 0)? 0: (10 - $iSum);
return "$iSum";
}
#------------------------------------------------------------------------------
# new (for GD::Barcode::ITF)
#------------------------------------------------------------------------------
sub barcode($) {
my ($oThis) = @_;
my($i, $sRes);
my $sTxt = $oThis->{text};
my $rhPtn ={
'0' => '00110',
'1' => '10001',
'2' => '01001',
'3' => '11000',
'4' => '00101',
'5' => '10100',
'6' => '01100',
'7' => '00011',
'8' => '10010',
'9' => '01010'
};
$sRes = '';
$sRes .= '1010'; #START
for( $i = 0; $i < length($sTxt); $i+=2 ){
my $sBlack = $rhPtn->{substr($sTxt, $i, 1)};
my $sWhite = $rhPtn->{substr($sTxt, $i+1, 1)};
for(my $j = 0; $j < length($sBlack); $j++) {
$sRes .= (substr($sBlack, $j, 1) eq '1')? '1' x 3: '1';
$sRes .= (substr($sWhite, $j, 1) eq '1')? '0' x 3: '0';
}
}
$sRes .= '1' x 3 . '01'; #STOP
return $sRes;
}
#------------------------------------------------------------------------------
# plot (for GD::Barcode::ITF)
#------------------------------------------------------------------------------
sub plot($;%) {
my($oThis, %hParam) =@_;
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__