turtle练习 分形树最终优化
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# 绘制分形树
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()
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