e51cfa93a9ccc4ed13524b486fcf6ed1c5a5f5b2
1 #!/usr/bin/env python
2 '''
3 Copyright (C) 2007 Martin Owens
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 '''
20 from Base import Barcode
21 import sys
23 leftMap = [ '0001101', '0011001', '0010011', '0111101', '0100011', '0110001', '0101111', '0111011', '0110111', '0001011' ]
24 rightMap = [ '1110010', '1100110', '1101100', '1000010', '1011100', '1001110', '1010000', '1000100', '1001000', '1110100' ]
25 weightMap = [ 3, 1, 3, 1, 3, 1, 3 ]
27 guardBar = '202';
28 centerBar = '02020';
30 class Object(Barcode):
31 def encode(self, number):
32 result = ''
34 # Rejig the label for use
35 self.label = number[:4] + ' ' + number[4:]
37 if len(number) < 7 or len(number) > 8 or not number.isdigit():
38 sys.stderr.write("Can not encode '" + number + "' into EAN8 Barcode, Size must be 7 or 8 Numbers only\n")
40 if len(number) == 7:
41 number = number + self.calculateChecksum(number)
43 result = result + guardBar
45 i = 0
46 for num in number:
47 if i >= 4:
48 result = result + rightMap[int(num)]
49 else:
50 result = result + leftMap[int(num)]
52 i = i + 1
53 if i == 4:
54 result = result + centerBar;
56 result = result + guardBar;
58 self.inclabel = ' ' + number[:4] + ' ' + number[4:]
59 return result;
62 def calculateChecksum(self, number):
63 weight = 0;
64 i = 0;
66 for num in number:
67 weight = weight + (int(num) * weightMap[i])
68 i = i + 1
70 weight = 10 - (weight % 10)
71 if weight == 10:
72 weight = 0
73 return str(weight);
75 def getStyle(self, index):
76 result = { 'width' : '1', 'top' : int(self.y), 'write' : True }
77 if index==0: # White Space
78 result['write'] = False
79 elif index==1: # Black Bar
80 result['height'] = int(self.height)
81 elif index==2: # Guide Bar
82 result['height'] = int(self.height) + 8
83 return result