71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
# coding=utf-8
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#
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# Copyright (C) 2010 Geoffrey Mosini
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA.
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#
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"""
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Generate barcodes for Code25-interleaved 2 of 5, for Inkscape.
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"""
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from .Base import Barcode
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from inkex.localization import inkex_gettext as _
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# 1 means thick, 0 means thin
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ENCODE = {
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"0": "00110",
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"1": "10001",
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"2": "01001",
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"3": "11000",
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"4": "00101",
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"5": "10100",
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"6": "01100",
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"7": "00011",
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"8": "10010",
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"9": "01010",
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}
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class Code25i(Barcode):
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"""Convert a text into string binary of black and white markers"""
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# Start and stop code are already encoded into white (0) and black(1) bars
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def encode(self, text):
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if not text.isdigit():
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return self.error(text, _("CODE25 can only encode numbers."))
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number = text
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# Number of figures to encode must be even,
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# a 0 is added to the left in case it's odd.
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if len(number) % 2 > 0:
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number = "0" + number
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# Number is encoded by pairs of 2 figures
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size = len(number) // 2
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encoded = "1010"
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for i in range(size):
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# First in the pair is encoded in black (1), second in white (0)
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black = ENCODE[number[i * 2]]
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white = ENCODE[number[i * 2 + 1]]
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for j in range(5):
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if black[j] == "1":
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encoded += "11"
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else:
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encoded += "1"
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if white[j] == "1":
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encoded += "00"
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else:
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encoded += "0"
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return encoded + "1101"
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