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# coding=utf-8
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
"""
Python barcode renderer for RM4CC barcodes. Designed for use with Inkscape.
"""
from .Base import Barcode
map = {
'(': '25',
')': '3',
'0': '05053535',
'1': '05152535',
'2': '05153525',
'3': '15052535',
'4': '15053525',
'5': '15152525',
'6': '05251535',
'7': '05350535',
'8': '05351525',
'9': '15250535',
'A': '15251525',
'B': '15350525',
'C': '05253515',
'D': '05352515',
'E': '05353505',
'F': '15252515',
'G': '15253505',
'H': '15352505',
'I': '25051535',
'J': '25150535',
'K': '25151525',
'L': '35050535',
'M': '35051525',
'N': '35150525',
'O': '25053525',
'P': '25152515',
'Q': '25153505',
'R': '35052515',
'S': '35053505',
'T': '35152505',
'U': '25251515',
'V': '25350515',
'W': '25351505',
'X': '35250515',
'Y': '35251505',
'Z': '35350505',
}
check = ['ZUVWXY', '501234', 'B6789A', 'HCDEFG', 'NIJKLM', 'TOPQRS']
(BAR_TRACK, BAR_DOWN, BAR_UP, BAR_FULL, BAR_NONE, WHITE_SPACE) = range(6)
class Rm4scc(Barcode):
default_height = 18
def encode(self, text):
result = ''
text = text.upper()
text.replace('(', '')
text.replace(')', '')
text = '(' + text + self.checksum(text) + ')'
i = 0
for char in text:
if char in map:
result = result + map[char]
i += 1
return result
# given a string of data, return the check character
def checksum(self, text):
total_lower = 0
total_upper = 0
for char in text:
if char in map:
bars = map[char][0:8:2]
lower = 0
upper = 0
if int(bars[0]) & 1:
lower += 4
if int(bars[1]) & 1:
lower += 2
if int(bars[2]) & 1:
lower += 1
if int(bars[0]) & 2:
upper += 4
if int(bars[1]) & 2:
upper += 2
if int(bars[2]) & 2:
upper += 1
total_lower += lower % 6
total_upper += upper % 6
total_lower = total_upper % 6
total_upper %= 6
checkchar = check[total_upper][total_lower]
return checkchar
def get_style(self, index):
"""Royal Mail Barcodes use a completely different style"""
result = {'width': 2, 'write': True, 'top': 0}
if index == BAR_TRACK: # Track Bar
result['top'] = 6
result['height'] = 5
elif index == BAR_DOWN: # Decender Bar
result['top'] = 6
result['height'] = 11
elif index == BAR_UP: # Accender Bar
result['height'] = 11
elif index == BAR_FULL: # Full Bar
result['height'] = 17
elif index == WHITE_SPACE: # White Space
result['write'] = False
return result
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