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()

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()

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()