code: def draw_cornu_flat(x0, y0, t0, t1, s0, c0, flip, cs, ss, cmd):
      
      
      
      for j in range(0, 100):
          t = j * .01
          s, c = eval_cornu(t0 + t * (t1 - t0))
          s *= flip
          s -= s0
          c -= c0
          #print '%', c, s
          x = c * cs - s * ss
          y = s * cs + c * ss
          print_pt(x0 + x, y0 + y, cmd)
          cmd = 'lineto'
      return cmd
docs: Raph Levien's code draws fast LINETO segments.