python 雪花

#KochDrawV2.py
import turtle
def koch(size, n):
	if n == 0:
		turtle.speed(0)
		turtle.fd(size)
		turtle.fillcolor("yellow")
	else:
		for angle in [0, 60, -120, 60]:
			turtle.left(angle)
			koch(size/3, n-1)
def main():
	turtle.setup(600,600)
	turtle.speed(0)
	# turtle.Turtle().screen.delay(0)
	turtle.penup()
	# turtle.penup()
	turtle.goto(-200, 100)
	turtle.pendown()
	turtle.pensize(2)
level = 3 # 3阶科赫雪花，阶数
koch(100, level)
turtle.right(120)
koch(100, level)
turtle.right(120)
koch(100, level)
turtle.fillcolor("yellow")
turtle.hideturtle()
turtle.done()
main()