codebarre.py

Created on August 29, 2019

1.11 KB

codebarre(“5011386029399”) affiche le code à barres EAN13 correspondant.

Attention, un code à barres erroné est refusé.

from kandinsky import set_pixel,draw_string

def codebarre(ch="5011386029399"):
  s=0
  for i,e in enumerate(ch):
    s+=int(e)*(1+2*(i%2))
    s%=10
  if s!=0:
    raise ValueError("Code errone")

  codes={"L":["0001101","0011001","0010011","0111101","0100011",
              "0110001","0101111","0111011","0110111","0001011"]}
  codes["R"]=["".join({"0":"1","1":"0"}[c] for c in l) for l in codes["L"]]
  codes["G"]=["".join(l[-i-1] for i in range(7)) for l in codes["R"]]
  choix=["LLLLLL","LLGLGG","LLGGLG","LLGGGL","LGLLGG",
         "LGGLLG","LGGGLL","LGLGLG","LGLGGL","LGGLGL"]

  barres="101"
  gauche=choix[int(ch[0])]
  for i in range(1,7):
    barres+=codes[gauche[i-1]][int(ch[i])]
  barres+="01010"
  for i in range(7,13):
    barres+=codes["R"][int(ch[i])]
  barres+="101"

  i=53
  for j,e in enumerate(ch):
    draw_string(e,i,162)
    if j in {0,6}:
      i+=21
    else:
      i+=14
  for i,e in enumerate(barres):
    if e=="1":
      if i in {0,2,46,48,92,94}:
        l=111
      else:
        l=100
      for j in range(l):
        set_pixel(65+2*i,j+60,(0,0,0))
        set_pixel(66+2*i,j+60,(0,0,0))