python绘制樱花树源码和解析

源码和解析"/>

python绘制樱花树源码和解析

樱花树原理：利用递归策略和random函数

import random
import turtle
def draw_tree(branch,t):if branch>2:if branch>=8 and branch<=10:t.color('red')t.pensize(branch/2)elif branch<8:t.color("pink")t.pensize(branch)elif branch>10 and branch<=20:t.color("#8a7081")t.pensize(branch/5)else:t.color('sienna')t.pensize(branch/10)t.forward(branch)#先画主干a = 1.6*random.random()b = 1.6 * random.random()t.left(20*a)#再画左支draw_tree(branch-10*b,t)#画左支t.right(40*a)draw_tree(branch-10*b,t)#右枝t.left(20*a)t.up()t.backward(branch)t.down()else:return
w = turtle.Screen()
t = turtle.Turtle()
t.up()
t.left(90)
t.backward(200)
t.down()
t.speed(0)
t.hideturtle()
draw_tree(60,t)
print("draw_finish")
w.exitonclick()