# hilbert_koch_curves.pyw

from turtle import *

def hilbert(size, level, parity=90):
    if level > 0:
        left(parity)
        hilbert(size, level-1, -parity)
        forward(size)
        right(parity)
        hilbert(size, level-1, parity)
        forward(size)
        hilbert(size, level-1, parity)
        right(parity)
        forward(size)
        hilbert(size, level-1, -parity)
        left(parity)

def koch(size, level):
    # F ==> F-F++F-F
    if level == 0:
        forward(size)
    else:
        koch(size, level-1)
        left(60)
        koch(size, level-1)
        right(120)
        koch(size, level-1)
        left(60)
        koch(size, level-1)

speed("fastest")
hilbert(15, 4)
#koch(3, 5)
done()