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index a7029d98224c53c22a944a78a42208a7c424681b..41681173b4eb0d30203f5d951b6c2e5add9246cd 100644 (file)
-#!/usr/bin/env python
-'''
-Copyright (C) 2007 Martin Owens
+#
+# Copyright (C) 2010 Martin Owens
+#
+# Thanks to Lineaire Chez of Inkbar ( www.inkbar.lineaire.net )
+#
+# 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
+#
+"""
+Python barcode renderer for EAN13 barcodes. Designed for use with Inkscape.
+"""
+
+from BaseEan import EanBarcode
+
+class Object(EanBarcode):
+ """Provide an Ean13 barcode generator"""
+ name = 'ean13'
+ lengths = [ 12 ]
+ checks = [ 13 ]
+
+ def _encode(self, n):
+ """Encode an ean13 barcode"""
+ self.label = self.space(n[0:1], 4, n[1:7], 5, n[7:], 7)
+ return self.enclose(
+ self.encode_interleaved(n[0], n[1:7]), self.encode_right(n[7:]) )
-Thanks to Lineaire Chez of Inkbar ( www.inkbar.lineaire.net )
-
-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
-import sys
-
-mapLeftFaimly = [
- [ "0001101","0011001","0010011","0111101","0100011","0110001","0101111","0111011","0110111","0001011" ],
- [ "0100111","0110011","0011011","0100001","0011101","0111001","0000101","0010001","0001001","0010111" ],
-]
-mapRight = [ "1110010","1100110","1101100","1000010","1011100","1001110","1010000","1000100","1001000","1110100" ]
-mapFaimly = [ '000000','001011','001101','001110','010011','011001','011100','010101','010110','011010' ]
-
-guardBar = '202';
-centerBar = '02020';
-
-class Object(Barcode):
- def encode(self, number):
- result = ''
-
- if len(number) < 12 or len(number) > 13 or not number.isdigit():
- sys.stderr.write("Can not encode '" + number + "' into EAN13 Barcode, Size must be 12 numbers only\n")
- return
-
- if len(number) == 12:
- number = number + self.getChecksum(number)
- else:
- if not self.verifyChecksum(number):
- sys.stderr.write("EAN13 Checksum not correct for this barcode, omit last character to generate new checksum.\n")
- return
-
- result = result + guardBar
- family = mapFaimly[int(number[0])]
-
- i = 0
- for i in range(0,6):
- mapLeft = mapLeftFaimly[int(family[i])]
- result += mapLeft[int(number[i+1])]
-
- result += centerBar
-
- for i in range (7,13):
- result += mapRight[int(number[i])]
-
- result = result + guardBar;
-
- self.label = number[0] + ' ' + number[1:7] + ' ' + number[7:] + ' '
- self.inclabel = self.label
- return result;
-
- def getChecksum(self, number):
- # UPCA/EAN13
- weight=[3,1]*6
- magic=10
- sum = 0
- # We need to work from left to right so reverse
- number = number[::-1]
- # checksum based on first 12 digits.
- for i in range(len(number)):
- sum = sum + int(number[i]) * weight[i]
-
- # Mod it down to a single digit
- z = ( magic - (sum % magic) ) % magic
- if z < 0 or z >= magic:
- return 0
-
- return str(z)
-
- def verifyChecksum(self, number):
- new = self.getChecksum(number[:-1])
- existing = number[-1]
- return new == existing
-
- def getStyle(self, index):
- result = { 'width' : '1', 'top' : int(self.y), 'write' : True }
- if index==0: # White Space
- result['write'] = False
- elif index==1: # Black Bar
- result['height'] = int(self.height)
- elif index==2: # Guide Bar
- result['height'] = int(self.height) + 5
- return result