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- package GD::Barcode::UPCA;
- use strict;
- 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 $leftOddBar ={
- "0" => "0001101",
- "1" => "0011001",
- "2" => "0010011",
- "3" => "0111101",
- "4" => "0100011",
- "5" => "0110001",
- "6" => "0101111",
- "7" => "0111011",
- "8" => "0110111",
- "9" => "0001011"
- };
- my $rightBar = {
- "0" => "1110010",
- "1" => "1100110",
- "2" => "1101100",
- "3" => "1000010",
- "4" => "1011100",
- "5" => "1001110",
- "6" => "1010000",
- "7" => "1000100",
- "8" => "1001000",
- "9" => "1110100"
- };
- my $guardBar = "G0G";
- my $centerBar = "0G0G0";
- #------------------------------------------------------------------------------
- # new (for GD::Barcode::UPCA)
- #------------------------------------------------------------------------------
- sub new($$) {
- my($sClass, $sTxt) = @_;
- $errStr ='';
- my $oThis = {};
- bless $oThis;
- return undef if($errStr = $oThis->init($sTxt));
- return $oThis;
- }
- #------------------------------------------------------------------------------
- # init (for GD::Barcode::UPCA)
- #------------------------------------------------------------------------------
- sub init($$){
- my($oThis, $sTxt) =@_;
- return 'Invalid characters' if($sTxt =~ /[^0-9]/);
-
- #Check
- my $iLen = length($sTxt);
- if($iLen == 11) {
- $sTxt .= calcUPCACD( $sTxt );
- }
- elsif($iLen == 12) {
- ;
- }
- else {
- return 'Invalid Length';
- }
- $oThis->{text} = $sTxt;
- return '';
- }
- #------------------------------------------------------------------------------
- # calcUPCACD (for GD::Barcode::UPCA)
- #------------------------------------------------------------------------------
- sub calcUPCACD {
- my( $sTxt ) = @_;
- my( $i, $iSum, @aWeight);
-
- @aWeight = (3,1,3,1,3,1,3,1,3,1,3);
- $iSum = 0;
- for( $i = 0; $i < 11; $i++ ) {
- $iSum += substr($sTxt, $i, 1) * $aWeight[$i];
- }
- $iSum %= 10;
- $iSum = ($iSum == 0)? 0: (10 - $iSum);
- return "$iSum";
- }
- #------------------------------------------------------------------------------
- # new (for GD::Barcode::UPCA)
- #------------------------------------------------------------------------------
- sub barcode($) {
- my ($oThis) = @_;
- my ($topDigit, $oddEven, $c, $i);
- my ($sRes);
-
- #(1)Init
- my $sTxt = $oThis->{text};
- $sRes = $guardBar; #GUARD
- #(2)Left 6 letters
- my $s1st = GD::Barcode::barPtn( substr($sTxt, 0, 1), $leftOddBar );
- $s1st =~ tr/1/G/;
- $sRes .= $s1st;
- for( $i = 1; $i < 6; $i++ ) {
- $sRes .= GD::Barcode::barPtn( substr($sTxt, $i, 1), $leftOddBar );
- }
-
- #(4)Center
- $sRes .= $centerBar;
-
- #(5)Right
- for( $i = 6; $i < 11; $i++ ) {
- $sRes .= GD::Barcode::barPtn( substr($sTxt, $i, 1), $rightBar );
- }
- my $sLast = GD::Barcode::barPtn( substr($sTxt, 11, 1), $rightBar );
- $sLast =~ tr/1/G/;
- $sRes .= $sLast;
-
- #(6)GUARD
- $sRes .= $guardBar;
- return $sRes;
- }
- #------------------------------------------------------------------------------
- # plot (for GD::Barcode::UPCA)
- #------------------------------------------------------------------------------
- sub plot($%) {
- my($oThis, %hParam) =@_;
-
- my $sTxt = $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)+ 2*($fW+1);
- #Bar Image
- ($oGd, $cBlack) = GD::Barcode::plot($sPtn, $iWidth, $iHeight, $fH, $fW+1);
- #String
- $oGd->string(GD::Font->Small, 0, $iHeight - $fH, substr($sTxt, 0, 1), $cBlack);
- $oGd->string(GD::Font->Small, $fW + 14, $iHeight - $fH, substr($sTxt, 1, 5), $cBlack);
- $oGd->string(GD::Font->Small, $fW + 53, $iHeight - $fH, substr($sTxt, 6, 5), $cBlack);
- $oGd->string(GD::Font->Small, $fW + 98, $iHeight - $fH, substr($sTxt,11, 1), $cBlack);
- }
- return $oGd;
- }
- 1;
- __END__
-
-
- =head1 NAME
-
- GD::Barcode::UPCA - Create UPC-A barcode image with GD
-
- =head1 SYNOPSIS
-
- I<ex. CGI>
-
- use GD::Barcode::UPCA;
- binmode(STDOUT);
- print "Content-Type: image/png\n\n";
- print GD::Barcode::UPCA->new('12345678901')->plot->png;
-
- I<with Error Check>
-
- my $oGdBar = GD::Barcode::UPCA->new('123456789');
- die $GD::Barcode::UPCA::errStr unless($oGdBar); #Invalid Length
-
-
- =head1 DESCRIPTION
-
- GD::Barcode::UPCA is a subclass of GD::Barcode and allows you to
- create UPC-A barcode image with GD.
- This module based on "Generate Barcode Ver 1.02 By Shisei Hanai 97/08/22".
-
- =head2 new
-
- I<$oGdBar> = GD::Barcode::UPCA->new(I<$sTxt>);
-
- Constructor.
- Creates a GD::Barcode::UPCA object for I<$sTxt>.
- I<$sTxt> has 11 or 12 numeric characters([0-9]).
- If I<$sTxt> has 11 characters, this module calacurates CD for you.
-
- =head2 plot()
-
- I<$oGd> = $oGdBar->plot([Height => I<$iHeight>, NoText => I<0 | 1>]);
-
- creates GD object with barcode image for the I<$sTxt> specified at L<new> method.
- I<$iHeight> is height of the image. If I<NoText> is 1, the image has no text image of I<$sTxt>.
-
- ex.
- my $oGdB = GD::Barcode::UPCA->new('12345678901');
- my $oGD = $oGdB->plot(NoText=>1, Height => 20);
- # $sGD is a GD image with Height=>20 pixels, with no text.
-
- =head2 barcode()
-
- I<$sPtn> = $oGdBar->barcode();
-
- returns a barcode pattern in string with '1', 'G' and '0'.
- '1' means black, 'G' also means black but little bit long,
- '0' means white.
-
- ex.
- my $oGdB = GD::Barcode::UPCA->new('12345678901');
- my $sPtn = $oGdB->barcode();
- # $sPtn = '';
-
- =head2 $errStr
-
- $GD::Barcode::UPCA::errStr
-
- has error message.
-
- =head2 $text
-
- $oGdBar->{$text}
-
- has barcode text based on I<$sTxt> specified in L<new> method.
-
-
- =head1 AUTHOR
-
- Kawai Takanori GCD00051@nifty.ne.jp
-
- =head1 COPYRIGHT
-
- The GD::Barocde::UPCA 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.
-
- =head1 SEE ALSO
-
- GD::Barcode
-
- =cut
-