python伪3D多彩重力弹球

以下是部分代码预览:

"""3D多彩重力弹球，这是用Python的海龟画图制作的3D多彩重力弹球。
在程序中新建了Ball类，它继承自Turtle，由于它不需要画画，所以它在初始化的时候就让它抬笔penup。
给Ball设计了xspeed和yspeed属性，这代表每次移动的水平和垂直位移。由于是重力弹球，所以设计了加速度属性。
"""
from turtle import *
from random import randint,choice
from time import sleep
    
class Ball(Turtle):
    def __init__(self,color,size,height):
        Turtle.__init__(self,visible=False,shape='blank')       
        self.penup()                        # 抬笔
        self.xspeed = 0                     # 单位水平位移
        self.yspeed = 0                     # 垂直水平位移
        imagefile = color + "_balls/ball-" + str(size) + ".gif"
        self.shape(imagefile)               # 设定形状
        self.setx(randint(50-self.screen.window_width()//2,self.screen.window_width()//2-50))
        self.sety(height)
        self.accspeed = -0.5 
        self.showturtle()       

if __name__ == "__main__":

    colors = ["cyan",'yellow','green','pink','purple']
    size = list(range(10,101,10))

    yellow_balls = ["yellow_balls/ball-" + str(i) + ".gif" for i in size]
    cyan_balls = ["cyan_balls/ball-" + str(i) + ".gif" for i in size]
    green_balls = ["green_balls/ball-" + str(i) + ".gif" for i in size]
    pink_balls = ["pink_balls/ball-" + str(i) + ".gif" for i in size]
    purple_balls = ["purple_balls/ball-" + str(i) + ".gif" for i in size]
     
    screen = Screen()
    screen.title("3D多彩重力弹球，作者：李兴球")
    screen.delay(0)
    screen.bgcolor("black")
    # screen.bgpic("bg3d.png")
    [screen.addshape(image) for image in yellow_balls]
    [screen.addshape(image) for image in cyan_balls]
    [screen.addshape(image) for image in green_balls]
    [screen.addshape(image) for image in pink_balls]
    [screen.addshape(image) for image in purple_balls]    

    screen.mainloop()  
            

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