Barcode for EAN 5

[John Culleton-3]

Typically on a book one has a barcode for the ISBN (EAN-13) and
optionally a barcode for the price (EAN-5). Inkscape 47 rel 3 provides
the first but not the second.  Could this be added?
--
John Culleton
"Create Book Covers with Scribus"
http://www.booklocker.com/books/4055.html

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[Alvin Penner]

I would suggest filing this as a bug report.

[Aaron Spike-2]

John Culleton wrote:
> Typically on a book one has a barcode for the ISBN (EAN-13) and
> optionally a barcode for the price (EAN-5). Inkscape 47 rel 3 provides
> the first but not the second.  Could this be added?

(Grain of salt: I don't know anything about barcodes. I simply edited
the EAN13 code after a very quick reading of the WP page on EAN5)

The attached python script might render EAN5 barcodes in Inkscape after
slight and obvious edits to Barcode/__init__.py and render_barcodes.inx

I'm unable to create a patch myself right now, but if someone can prove
that it works please turn it into a proper patch.

Aaron Spike

'''
Copyright (C) 2007 Martin Owens
Copyright (C) 2009 Aaron C Spike

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

mapLeftFamily = [
    [ "0001101","0011001","0010011","0111101","0100011","0110001","0101111","0111011","0110111","0001011" ], #L
    [ "0100111","0110011","0011011","0100001","0011101","0111001","0000101","0010001","0001001","0010111" ], #G
]
mapFamily  = [ '11000','10100','10010','10001','01100','00110','00011','01010','01001','00101' ]

startBar = '01011';
sepBar = '01';

class Object(Barcode):
    def encode(self, number):
        result = []

        if len(number) != 5 or not number.isdigit():
            sys.stderr.write("Can not encode '" + number + "' into EAN5 Barcode, Size must be 5 numbers only\n")
            return

        check = self.getChecksum(number)
        family = mapFamily[check]

        for i in range(5):
            mapLeft = mapLeftFamily[int(family[i])]
            result.append(mapLeft[int(number[i])])

        self.label    = number
        self.inclabel = self.label
        return startBar + '01'.join(result)

    def getChecksum(self, number):
        return sum([int(n)*int(m) for n,m in zip(number, '39393')]) % 10

    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


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