Python的turtle库绘图-樱花动态飘落

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# *===================================*
# -*- coding: utf-8 -*-
# * Time : 2020-02-24 19:01
# * Author : zhangsf
# *===================================*
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()