def terrain(): #Affiche la grille

  fill_rect(8,21,300,200,c[9])

  for y in range(21,243,20):

    for x in range(8,309):

      set_pixel(x,y,c[10])

  for x in range(8,320,20):

    for y in range(21,222):

      set_pixel(x,y,c[10])