116 lines
2.2 KiB
Python
116 lines
2.2 KiB
Python
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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This module can generate EAN-8 and EAN-13 barcodes
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(C) 2022 Louis Heredero louis.heredero@edu.vs.ch
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"""
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import pygame
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A = [
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0b0001101,
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0b0011001,
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0b0010011,
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0b0111101,
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0b0100011,
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0b0110001,
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0b0101111,
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0b0111011,
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0b0110111,
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0b0001011
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]
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# XOR 0b1111111
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C = list(map(lambda a: a^127, A))
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# Reverse bit order
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B = list(map(lambda c: int(f"{c:07b}"[::-1], 2), C))
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ean13_patterns = [
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"AAAAAA",
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"AABABB",
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"AABBAB",
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"AABBBA",
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"ABAABB",
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"ABBAAB",
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"ABBBAA",
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"ABABAB",
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"ABABBA",
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"ABBABA"
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]
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def bin_list(n):
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return list(map(int, f"{n:07b}"))
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def luhn(digits):
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checksum = sum([
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digits[-i-1]*(3-i%2*2)
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for i in range(len(digits))
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])
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ctrl_key = 10 - checksum%10
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if ctrl_key == 10:
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ctrl_key = 0
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return ctrl_key
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def ean8(digits):
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digits.append(luhn(digits))
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elmts = []
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elmts += [1,0,1] #delimiter
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for digit in digits[:4]:
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elmts += bin_list(A[digit])
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elmts += [0,1,0,1,0] #middle delimiter
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for digit in digits[4:]:
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elmts += bin_list(C[digit])
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elmts += [1,0,1] #delimiter
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return elmts
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def ean13(digits):
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pattern = ean13_patterns[digits[0]]
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digits.append(luhn(digits))
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elmts = []
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elmts += [1,0,1] #delimiter
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for d in range(1,7):
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_ = A if pattern[d-1] == "A" else B
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digit = digits[d]
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elmts += bin_list(_[digit])
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elmts += [0,1,0,1,0] #middle delimiter
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for digit in digits[7:]:
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elmts += bin_list(C[digit])
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elmts += [1,0,1] #delimiter
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return elmts
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def draw_barcode(barcode, win):
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width = win.get_width()*0.8
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height = win.get_height()*0.5
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bar_w = width/len(barcode)
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rnd_bar_w = round(bar_w)
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win.fill((255,255,255))
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x = win.get_width()*0.1
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y = win.get_height()*0.25
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for c in barcode:
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if c:
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pygame.draw.rect(win, (0,0,0), [x, y, rnd_bar_w, height])
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x += bar_w
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if __name__ == "__main__":
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import base
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b = base.Base(800, 500, "EAN-8 / EAN-13 barcode generator")
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#barcode = ean8([8,4,2,7,3,7,2])
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barcode = ean13([9,7,8,2,9,4,0,6,2,1,0,5])
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draw_barcode(barcode, b.w)
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b.main()
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