#coding:utf-

from tkinter import *

import random

import time

class Ball:

    #创建一个球类

    def __init__(self, canvas, color):

        self.canvas = canvas

        self.id = canvas.create_oval(, , , , fill=color)

        #返回刚好划小球的id，create_oval创建一个椭圆

        self.canvas.move(self.id, , )

        #把椭圆移动到画布

        starts = [-, -, -, , , ]

        random.shuffle(starts)

        #随机排列

        self.x = starts[]

        self.y = -

        self.canvas_height = self.canvas.winfo_height()

        #获取画布当前高度

        self.canvas_width = self.canvas.winfo_width()

        #获取画布当前宽度

    def draw(self):

        self.canvas.move(self.id, self.x, self.y)

        #让小球水平和垂直移动

        pos = self.canvas.coords(self.id)

        #coords返回画布上画好的x和y坐标

        #判断小球是否撞到画布顶部或者底部，保证小球反弹回去，不消失

        if pos[] <= :

            self.y =

        if pos[] >= self.canvas_height:

            self.y = -

        if pos[] <= :

            self.x =

        if pos[] >= self.canvas_width:

            self.x = -

tk = Tk()

tk.title("Game")

tk.resizable(, )

#窗口大小不可调整

tk.wm_attributes("-topmost", )

#使画布窗口置于所有窗口之前

canvas = Canvas(tk,width=, height=, bd=, highlightthickness=)

#bd和highlighttthickness是为了保证画布没有边框

canvas.pack()

tk.update()

#动画初始化

ballone = Ball(canvas, 'red')

balltwo = Ball(canvas, 'blue')

while :

    #画布一出现会马上消失，为了防止画布消失，用tkinter一直重画

    ballone.draw()

    balltwo.draw()

    tk.update_idletasks()

    tk.update()

    time.sleep(0.01)