77 lines
2.2 KiB
Python
77 lines
2.2 KiB
Python
"""Module: barcode.itf
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:Provided barcodes: Interleaved 2 of 5
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"""
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__docformat__ = "restructuredtext en"
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from barcode.base import Barcode
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from barcode.charsets import itf
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from barcode.errors import IllegalCharacterError
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MIN_SIZE = 0.2
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MIN_QUIET_ZONE = 6.4
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class ITF(Barcode):
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"""Initializes a new ITF instance.
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:parameters:
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code : String
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ITF (Interleaved 2 of 5) numeric string
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writer : barcode.writer Instance
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The writer to render the barcode (default: SVGWriter).
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narrow: Integer
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Width of the narrow elements (default: 2)
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wide: Integer
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Width of the wide elements (default: 5)
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wide/narrow must be in the range 2..3
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"""
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name = "ITF"
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def __init__(self, code, writer=None, narrow=2, wide=5):
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if not code.isdigit():
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raise IllegalCharacterError("ITF code can only contain numbers.")
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# Length must be even, prepend 0 if necessary
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if len(code) % 2 != 0:
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code = "0" + code
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self.code = code
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self.writer = writer or Barcode.default_writer()
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self.narrow = narrow
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self.wide = wide
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def __str__(self):
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return self.code
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def get_fullcode(self):
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return self.code
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def build(self):
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data = itf.START
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for i in range(0, len(self.code), 2):
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bars_digit = int(self.code[i])
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spaces_digit = int(self.code[i + 1])
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for j in range(5):
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data += itf.CODES[bars_digit][j].upper()
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data += itf.CODES[spaces_digit][j].lower()
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data += itf.STOP
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raw = ""
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for e in data:
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if e == "W":
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raw += "1" * self.wide
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if e == "w":
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raw += "0" * self.wide
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if e == "N":
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raw += "1" * self.narrow
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if e == "n":
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raw += "0" * self.narrow
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return [raw]
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def render(self, writer_options, text=None):
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options = {
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"module_width": MIN_SIZE / self.narrow,
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"quiet_zone": MIN_QUIET_ZONE,
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}
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options.update(writer_options or {})
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return Barcode.render(self, options, text)
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