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Spectre visible. Script adapté de https://workshop.numworks.com/python/uncurieux/visible_spectrum Nécessite KhiCAS.

def spectrum():
  r=255
  g=0
  b=255
  for i in range(320):
    if i<54:
        r=r-int(255/53)
    elif i>85 and i<102:
        g=g+int(255/16)
    elif i>101 and i<123:
        b=b-int(255/21)
    elif i>170 and i<194:
        r=r+int(255/30)
    elif i>194 and i<235:
        g=g-int(255/43)
        r=255
    elif i>233:
        g=0
    fill_rect(i,0,1,100,rgb(r,g,b)) 
  m=-1
  draw_string("nm",190,85)
  for n in range(10):
   l=int(input("l (400,700): "))
   if l<=0:
     break
   if m>=0:
     cm=int(((m-400)*320)/300)
     fill_rect(cm,50,1,50,65535)
   cm=int(((l-400)*320)/300)
   fill_rect(cm,50,1,50,0)
   draw_string(str(l),150,85)
   m=l