How to think like a Computer Scientist: 课后习题第十八章2-优快云博客

本文将介绍如何利用Python编程语言实现绘制四维分形树的过程，并通过实例展示了绘制效果。首先导入必要的库，然后定义绘制四维分形树的函数，设置屏幕背景颜色和大小，初始化画笔参数，最后调用函数并设置睡眠时间，实现动画效果。通过调整参数，可以生成不同形态的四维分形树。

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import turtle
import time

def torn(t, order, size):
    if order == 0:
        t.forward(size)

    else:
        for angle in [85, -170, 85, 0]:
            torn(t,order - 1, size/2)
            t.right(angle)

wn = turtle.Screen()
wn.bgcolor("green")
wn.title("yuxiangyang is testing!")


tess = turtle.Turtle()
tess.color("navy blue")
tess.pensize(4)
tess.penup()
tess.forward(-100)
tess.left(90)
tess.forward(100)
tess.right(90)
tess.pendown()

torn(tess, 3, 300)


time.sleep(10)
wn.bye()

import turtle
import time

def torn(t, order, size):
    if order == 0:
        t.forward(size)

    else:
        for angle in [85, -170, 85, 0]:
            torn(t,order - 1, size/2)
            t.right(angle)

wn = turtle.Screen()
wn.bgcolor("green")
wn.title("yuxiangyang is testing!")


tess = turtle.Turtle()
tess.color("navy blue")
tess.pensize(4)
tess.penup()
tess.forward(-100)
tess.left(90)
tess.forward(150)
tess.right(90)
tess.pendown()

for i in range(4):
    torn(tess, 3, 300)
    tess.right(90)


time.sleep(10)
wn.bye()

import turtle
import time
import math

def torn(t, order, size):
    if order == 0:
        t.forward(size)

    else:
        sub_size = size/(2.0 + 2*math.sin(math.pi/36))
        print sub_size
        #sub_size = int(sub_size)
        for angle in [85, -170, 85, 0]:
            torn(t,order - 1, sub_size)
            t.right(angle)

wn = turtle.Screen()
wn.bgcolor("green")
wn.title("yuxiangyang is testing!")


tess = turtle.Turtle()
tess.color("navy blue")
turtle.screensize(1000,1000)
tess.pensize(4)
tess.penup()
tess.forward(-500)
tess.left(90)
tess.forward(150)
tess.right(90)
tess.pendown()

for order in range(3):
    for i in range(4):
        torn(tess, order+1, 300)
        tess.right(90)
    tess.penup()
    tess.forward(330)
    tess.pendown()



time.sleep(10)
wn.bye()