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Code39.py

00001 '''
Copyright (C) 2007 Martin Owens

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
'''

from Base import Barcode

encoding = {
      '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',
}

class Object(Barcode):
      # Convert a text into string binary of black and white markers
      def encode(self, text):
            text       = text.upper()
            self.label = text
            text       = '*' + text + '*'
            result     = ''
            # It isposible for us to encode code39
            # into full ascii, but this feature is
            # not enabled here
            for char in text:
                  if not encoding.has_key(char):
                        char = '-';

                  result = result + encoding[char] + '0';

            # Now we need to encode the code39, best read
            # the code to understand what it's up to:
            encoded = '';
            colour   = '1'; # 1 = Black, 0 = White
            for data in result:
                  if data == '1':
                        encoded = encoded + colour + colour
                  else:
                        encoded = encoded + colour
                  if colour == '1':
                        colour = '0'
                  else:
                        colour = '1'

            self.inclabel = text
            return encoded;


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