1 #
2 # Copyright (C) 2007 Martin Owens
3 #
4 # This program is free software; you can redistribute it and/or modify
5 # it under the terms of the GNU General Public License as published by
6 # the Free Software Foundation; either version 2 of the License, or
7 # (at your option) any later version.
8 #
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 # GNU General Public License for more details.
13 #
14 # You should have received a copy of the GNU General Public License
15 # along with this program; if not, write to the Free Software
16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 #
18 """
19 Python barcode renderer for Code39 barcodes. Designed for use with Inkscape.
20 """
22 from Base import Barcode
24 encoding = {
25 '0' : '000110100',
26 '1' : '100100001',
27 '2' : '001100001',
28 '3' : '101100000',
29 '4' : '000110001',
30 '5' : '100110000',
31 '6' : '001110000',
32 '7' : '000100101',
33 '8' : '100100100',
34 '9' : '001100100',
35 'A' : '100001001',
36 'B' : '001001001',
37 'C' : '101001000',
38 'D' : '000011001',
39 'E' : '100011000',
40 'F' : '001011000',
41 'G' : '000001101',
42 'H' : '100001100',
43 'I' : '001001100',
44 'J' : '000011100',
45 'K' : '100000011',
46 'L' : '001000011',
47 'M' : '101000010',
48 'N' : '000010011',
49 'O' : '100010010',
50 'P' : '001010010',
51 'Q' : '000000111',
52 'R' : '100000110',
53 'S' : '001000110',
54 'T' : '000010110',
55 'U' : '110000001',
56 'V' : '011000001',
57 'W' : '111000000',
58 'X' : '010010001',
59 'Y' : '110010000',
60 'Z' : '011010000',
61 '-' : '010000101',
62 '*' : '010010100',
63 '+' : '010001010',
64 '$' : '010101000',
65 '%' : '000101010',
66 '/' : '010100010',
67 '.' : '110000100',
68 ' ' : '011000100',
69 }
71 class Object(Barcode):
72 # Convert a text into string binary of black and white markers
73 def encode(self, text):
74 text = text.upper()
75 self.label = text
76 text = '*' + text + '*'
77 result = ''
78 # It isposible for us to encode code39
79 # into full ascii, but this feature is
80 # not enabled here
81 for char in text:
82 if not encoding.has_key(char):
83 char = '-';
85 result = result + encoding[char] + '0';
87 # Now we need to encode the code39, best read
88 # the code to understand what it's up to:
89 encoded = '';
90 colour = '1'; # 1 = Black, 0 = White
91 for data in result:
92 if data == '1':
93 encoded = encoded + colour + colour
94 else:
95 encoded = encoded + colour
96 if colour == '1':
97 colour = '0'
98 else:
99 colour = '1'
101 self.inclabel = text
102 return encoded;