from tkinter import*
import time
import random

class Ball:

def __init__(self,canvas,paddle,color):
    self.canvas = canvas
    self.paddle = paddle
    self.id = canvas.create_oval(10,10,25,25,fill=color)
    self.canvas.move(self.id,245,100)
    starts = [-3,-2,-1,1,2,3]
    random.shuffle(starts)
    self.x = starts[0]
    self.y = -3
    self.canvas_height = self.canvas.winfo_height()
    self.canvas_width = self.canvas.winfo_width()
    self.hit_bottom = False

def hit_paddle(self,pos):
    paddle_pos=self.canvas.coords(self.paddle.id)
    if pos[2]>=paddle_pos[0] and pos[0]<=paddle_pos[2]:
        if pos[3]>=paddle_pos[1] and pos[3]<=paddle_pos[3]:
            return True
    return False

def draw(self):
    self.canvas.move(self.id,self.x,self.y)
    pos = self.canvas.coords(self.id)
    if pos[1] <= 0:
        self.y = 4
    if pos[3] >= self.canvas_height:
        self.hit_bottom=True
    if self.hit_paddle(pos)==True:
        self.y=-4
    if pos[0] <= 0:
        self.x = 4
    if pos[2] >= self.canvas_width:
        self.x = -4

class Paddle:

def __init__(self,canvas,color):
    self.canvas = canvas
    self.id = canvas.create_rectangle(0,0,100,10,fill=color)
    self.canvas.move(self.id,200,400)
    self.x=0
    self.canvas_width = self.canvas.winfo_width()
    canvas.bind_all('<KeyPress-Left>',self.turn_left)
    canvas.bind_all('<KeyPress-Right>',self.turn_right)
    self.hit_bottom = False

def draw(self):
    self.canvas.move(self.id,self.x,0)
    pos = self.canvas.coords(self.id)
    if pos[0] <= 0:
        self.x = 0
    elif pos[2] >= self.canvas_width:
        self.x = 0

def turn_left(self,evt):
    self.x=-7

def turn_right(self,evt):
    self.x=7 
    

tk = Tk()
tk.title(“ 反弹吧！球球 ”) 跟单网

tk.resizable(0,0)

tk.wm_attributes(“-topmost”,1)
canvas = Canvas(tk,width=650,height=600,bd=0,highlightthickness=0)
canvas.pack()
tk.update()

paddle=Paddle(canvas,’blue’)
ball = Ball(canvas,paddle,’red’)

while 1:

if ball.hit_bottom==False:
    ball.draw()
    paddle.draw()
tk.update_idletasks()
tk.update()
time.sleep(0.01)

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