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python的科赫雪花-递归代码实例
#KochDrawV1.py
import turtle
def koch(size, n):
if n == 0:
turtle.fd(size)
else:
for angle in [0, 60, -120, 60]:
turtle.left(angle)
koch(size/3, n-1)
def main():
turtle.setup(800,400)
turtle.penup()
turtle.goto(-300, -50)
turtle.pendown()
turtle.pensize(2)
koch(600,3) # 0阶科赫曲线长度,阶数
turtle.hideturtle()
main()
上面是科赫曲线,下面是科赫雪花
#KochDrawV2.py
import turtle
def koch(size, n):
if n == 0:
turtle.fd(size)
else:
for angle in [0, 60, -120, 60]:
turtle.left(angle)
koch(size/3, n-1)
def main():
turtle.setup(600,600)
turtle.penup()
turtle.goto(-200, 100)
turtle.pendown()
turtle.pensize(2)
level = 3 # 3阶科赫雪花,阶数
koch(400,level)
turtle.right(120)
koch(400,level)
turtle.right(120)
koch(400,level)
turtle.hideturtle()
main()
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