# 繪制分形樹
import turtle

def draw_brach(brach_length):

if brach_length > 5:
turtle.pencolor("brown")
turtle.pensize(3)
turtle.forward(brach_length)
turtle.right(30)
draw_brach(brach_length - 15)

turtle.left(60)
draw_brach(brach_length - 15)

turtle.right(30)
turtle.up()
turtle.backward(brach_length)
turtle.down()
if brach_length<=10:
turtle.pencolor("green")
turtle.pensize(5)
turtle.forward(brach_length)
turtle.right(30)
draw_brach(brach_length - 15)

turtle.left(60)
draw_brach(brach_length - 15)

turtle.right(30)
turtle.up()
turtle.backward(brach_length)
turtle.down()

def main():
turtle.left(90)
turtle.up()
turtle.backward(200)
turtle.down()
turtle.pensize(10)
draw_brach(100)
turtle.exitonclick()
if __name__ == ‘__main__‘:
main()

turtle練習 分形樹最終優化