python的turtle模擬3d星空圖

from turtle import *
from random import random,randint

screen = Screen()
width ,height = 800,600
screen.setup(width,height)
screen.title("模擬3D星空")
screen.bgcolor("black")
screen.mode("logo")
screen.delay(0)#這裏要設爲0，不然很卡

t = Turtle(visible = False,shape='circle')
t.pencolor("white")
t.fillcolor("white")
t.penup()
t.setheading(-90)
t.goto(width/2,randint(-height/2,height/2))

stars = []
for i in range(200):
    star = t.clone()
    s =random() /3
    star.shapesize(s,s)
    star.speed(int(s*10))
    star.setx(width/2 + randint(1,width))
    star.sety( randint(-height/2,height/2))
    star.showturtle()
    stars.append(star)
while True:
    for star in stars:
        star.setx(star.xcor() - 3 * star.speed())
    if star.xcor()<-width/2:
        star.hideturtle()
        star.setx(width/2 + randint(1,width))
        star.sety( randint(-height/2,height/2))
        star.showturtle()