几棵漂亮的树

1.tree1

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)#画笔颜色
    pensize(n / 3)#画笔尺寸
    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()

效果：

 

 

2.tree2（随机树）

import turtle
import random
from turtle import *
from time import sleep
 
t = turtle.Turtle()
w = turtle.Screen()

def tree(branchLen, t):
    if branchLen > 3:
        if 8 <= branchLen <= 12:
            if random.randint(0, 2) == 0:
                t.color('snow')
            else:
                t.color('lightcoral')
            t.pensize(branchLen / 3)
        elif branchLen < 8:
            if random.randint(0, 1) == 0:
                t.color('snow')
            else:
                t.color('lightcoral')
            t.pensize(branchLen / 2)
        else:
            t.color('sienna')
            t.pensize(branchLen / 10)
 
        t.forward(branchLen)
        a = 1.5 * random.random()
        t.right(20*a)
        b = 1.5 * random.random()
        tree(branchLen-10*b, t)
        t.left(40*a)
        tree(branchLen-10*b, t)
        t.right(20*a)
        t.up()
        t.backward(branchLen)
        t.down()
 

效果：

 

 3.tree3

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)#画布背景颜色
ht()
speed(0)
tracer(0, 0)
left(90)
pu()
backward(300)
tree(13, 100)
done()

效果：

 

 4.tree4

from turtle import *
from random import *
 
# 画树方法
def drawTree(n, l):
    pendown()
    pencolor('#5d3c3c')
    pensize( n / 1.5)
    forward(l)
    if n > 0:
        dr = randint(30, 40)
        dl =  randint(30, 40)
        move = l * (random() * 0.4 + 0.5)
        right(dr)
        drawTree(n - 1, move)
        left(dr + dl)
        drawTree(n - 1, move)
        right(dl)
    else:
        drawPetal(3)
    penup()
    backward(l)

# 花瓣位置生成
def petalPlace(m, x, y):
    penup()
    goto(x, y)
    pendown()
    setheading(0)
    tracer(False)
    for i in range(m):
        if i == 0:
            drawPetal(5)
        else:
            penup()
            goto(x, y)
            a = randint(20, 400)
            b = randint(-50, 50)
            forward(a)
            left(90)
            forward(b)
            right(90)
            pendown()
            drawPetal(5)

# 花朵绘画方法
def drawPetal(n):
    colormode(255)
    r = randint(200, 255)
    g = randint(8, 158)
    b = randint(8, 158)
    begin_fill()
    fillcolor(r, g, b)
    pencolor(r, g, b)
    circle(n)
    end_fill()

# 启动方法
def run():
    setup(1.0, 1.0)
    penup()
    goto(-50, -150)
    left(90)
    pendown()
    hideturtle()
    tracer(False)
    drawTree(13, 150)
    petalPlace(160, -100, -150)

run()
done()

效果：

 

引自：https://blog.csdn.net/u012424148/article/details/88890478 

https://docs.python.org/zh-cn/3/library/turtle.html?highlight=turtle#turtle.TurtleScreen