转至：https://blog.csdn.net/weixin_43943977/article/details/102691392

1、灰色樱花树

from turtle import *

from random import *

from math import *

def tree(n,l):

pd()#下笔

#阴影效果

t = cos(radians(heading()+45))/8+0.25

pencolor(t,t,t)

pensize(n/3)

forward(l)#画树枝

if n>0:

b = random()*15+10 #右分支偏转角度

c = random()*15+10 #左分支偏转角度

d = l*(random()*0.25+0.7) #下一个分支的长度

#右转一定角度,画右分支

right(b)

tree(n-1,d)

#左转一定角度，画左分支

left(b+c)

tree(n-1,d)

#转回来

right(c)

else:

#画叶子

right(90)

n=cos(radians(heading()-45))/4+0.5

pencolor(n,n*0.8,n*0.8)

circle(3)

left(90)

#添加0.3倍的飘落叶子

if(random()>0.7):

pu()

#飘落

t = heading()

an = -40 +random()*40

setheading(an)

dis = int(800*random()*0.5 + 400*random()*0.3 + 200*random()*0.2)

forward(dis)

setheading(t)

#画叶子

pd()

right(90)

n = cos(radians(heading()-45))/4+0.5

pencolor(n*0.5+0.5,0.4+n*0.4,0.4+n*0.4)

circle(2)

left(90)

pu()

#返回

t=heading()

setheading(an)

backward(dis)

setheading(t)

pu()

backward(l)#退回

bgcolor(0.5,0.5,0.5)#背景色

ht()#隐藏turtle

speed(0)#速度 1-10渐进，0 最快

tracer(0,0)

pu()#抬笔

backward(100)

left(90)#左转90度

pu()#抬笔

backward(300)#后退300

tree(12,100)#递归7层

done()

2、动态的粉红樱花树

import turtle as T

import random

import time

# 画樱花的躯干(60,t)

def Tree(branch, t):

time.sleep(0.0005)

if branch > 3:

if 8 <= branch <= 12:

if random.randint(0, 2) == 0:

t.color('snow') # 白

else:

t.color('lightcoral') # 淡珊瑚色

t.pensize(branch / 3)

elif branch < 8:

if random.randint(0, 1) == 0:

t.color('snow')

else:

t.color('lightcoral') # 淡珊瑚色

t.pensize(branch / 2)

else:

t.color('sienna') # 赭(zhě)色

t.pensize(branch / 10) # 6

t.forward(branch)

a = 1.5 * random.random()

t.right(20 * a)

b = 1.5 * random.random()

Tree(branch - 10 * b, t)

t.left(40 * a)

Tree(branch - 10 * b, t)

t.right(20 * a)

t.up()

t.backward(branch)

t.down()

# 掉落的花瓣

def Petal(m, t):

for i in range(m):

a = 200 - 400 * random.random()

b = 10 - 20 * random.random()

t.up()

t.forward(b)

t.left(90)

t.forward(a)

t.down()

t.color('lightcoral') # 淡珊瑚色

t.circle(1)

t.up()

t.backward(a)

t.right(90)

t.backward(b)

# 绘图区域

t = T.Turtle()

# 画布大小

w = T.Screen()

t.hideturtle() # 隐藏画笔

t.getscreen().tracer(5, 0)

w.screensize(bg='wheat') # wheat小麦

t.left(90)

t.up()

t.backward(150)

t.down()

t.color('sienna')

# 画樱花的躯干

Tree(60, t)

# 掉落的花瓣

Petal(200, t)

w.exitonclick()

3、暗色樱花树

from turtle import *

from random import *

from math import *

def tree(n, l):

pd()

t = cos(radians(heading() + 45)) / 8 + 0.25

pencolor(t, t, t)

pensize(n / 4)

forward(l)

if n > 0:

b = random() * 15 + 10

c = random() * 15 + 10

d = l * (random() * 0.35 + 0.6)

right(b)

tree(n - 1, d)

left(b + c)

tree(n - 1, d)

right(c)

else:

right(90)

n = cos(radians(heading() - 45)) / 4 + 0.5

pencolor(n, n, n)

circle(2)

left(90)

pu()

backward(l)

bgcolor(0.5,0.5,0.5)

ht()

speed(0)

tracer(0, 0)

left(90)

pu()

backward(300)

tree(13, 100)

done()