我一直在读一本书，名叫《孩子的Python》，书中一步步讲述了如何创造弹跳球游戏。

最后的代码如下：from Tkinter import *

import random

tk = Tk()

tk.title("Paddleball Game")

tk.resizable(0,0) # tk window cannot be resized in x or y

tk.wm_attributes("-topmost", 1)

canvas = Canvas(tk, width=500, height=400, bd=0, highlightthickness=0) #no borders around the canvas

canvas.pack()

tk.update()

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):

if self.hit_bottom == False:

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

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

if pos[1] <= 0:

self.y = 3

if pos[3] >= self.canvas_height:

self.y = -3

if pos[3] >= self.canvas_height:

self.hit_bottom = True

if self.hit_paddle(pos) == True:

self.y = -3

if pos[0] <= 0:

self.x = 3

if pos[2] >= self.canvas_width:

self.x = -3

if ball.hit_bottom == False:

self.canvas.after(10, self.draw) # miliseconds, function

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, 300)

self.x = 0

self.canvas_width = self.canvas.winfo_width()

self.canvas.bind_all("", self.turn_left)

self.canvas.bind_all("", self.turn_right)

def draw(self):

if ball.hit_bottom == False:

self.canvas.move(self.id, self.x, 0)

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

if pos[0] <= 0:

self.x = 0

if pos[2] >= self.canvas_width:

self.x = 0

self.canvas.after(10, self.draw)

def turn_left(self, event):

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

if self.pos[0] >= 1:

self.x = -3

def turn_right(self, event):

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

if self.pos[2] <= self.canvas_width-1:

self.x = 3

paddle = Paddle(canvas, "blue")

ball = Ball(canvas, paddle, "red")

def start_game(event):

ball.draw()

canvas.bind_all("", start_game)

paddle.draw()

tk.mainloop()

现在，在读完这本书并了解了大部分内容之后，我试着单独重新创建游戏，并添加一些额外的内容。1)当我输了时，显示游戏结束，2)计算分数并显示，3)延迟开始(1秒)，4)在我输后停止球和桨的移动。

而且，我这样做是为了当我输了，如果我再次点击窗口，游戏中的文字就会消失，比分变为零，划桨和球又开始移动。

但是，我希望球从原来的位置开始，而不是从底部开始，如果可能的话，当我输了时，显示一个按钮，这样当我按下它时，游戏重新开始。

我的代码是：from Tkinter import *

import random

import time

root = Tk()

root.title("Testing... testing...")

root.resizable(0,0)

root.wm_attributes("-topmost", -1)

canvas = Canvas(root, width=500, height=400, bd=0,highlightthickness=0)

canvas.pack()

root.update()

count = 0

lost = False

class Ball:

def __init__(self, canvas, paddle, color):

self.canvas = canvas

self.paddle = paddle

self.id = canvas.create_oval(0, 0, 15, 15, fill=color)

self.canvas.move(self.id, 245, 200)

starts_x = [-3, -2, -1, 1, 2, 3]

random.shuffle(starts_x)

self.x = starts_x[0]

self.y = -3

self.canvas_height = self.canvas.winfo_height()

self.canvas_width = self.canvas.winfo_width()

def draw(self):

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

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

if pos[1] <= 0:

self.y = 3

if pos[3] >= self.canvas_height:

self.y = -3

if pos[0] <= 0:

self.x = 3

if pos[2] >= self.canvas_width:

self.x = -3

self.paddle_pos = self.canvas.coords(self.paddle.id)

if pos[2] >= self.paddle_pos[0] and pos[0] <= self.paddle_pos[2]:

if pos[3] >= self.paddle_pos[1] and pos[3] <= self.paddle_pos[3]:

self.y = -3

global count

count +=1

score()

if pos[3] <= self.canvas_height:

self.canvas.after(10, self.draw)

else:

game_over()

global lost

lost = True

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, 300)

self.x = 0

self.canvas_width = self.canvas.winfo_width()

self.canvas.bind_all("", self.move_left)

self.canvas.bind_all("", self.move_right)

def draw(self):

self.canvas.move(self.id, self.x, 0)

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

if self.pos[0] <= 0:

self.x = 0

if self.pos[2] >= self.canvas_width:

self.x = 0

global lost

if lost == False:

self.canvas.after(10, self.draw)

def move_left(self, event):

if self.pos[0] >= 0:

self.x = -3

def move_right(self, event):

if self.pos[2] <= self.canvas_width:

self.x = 3

def start_game(event):

global lost, count

lost = False

count = 0

score()

canvas.itemconfig(game, text=" ")

time.sleep(1)

paddle.draw()

ball.draw()

def score():

canvas.itemconfig(score_now, text="score: " + str(count))

def game_over():

canvas.itemconfig(game, text="Game over!")

paddle = Paddle(canvas, "blue")

ball = Ball(canvas, paddle, "red")

score_now = canvas.create_text(430, 20, text="score: " + str(count), fill = "red", font=("Arial", 16))

game = canvas.create_text(250, 150, text=" ", fill="red", font=("Arial", 20))

canvas.bind_all("", start_game)

root.mainloop()

有人能帮我吗？

谢谢。

编辑：我想我需要一种方法，在我输球后取消抽签，在比赛开始时重新抽签！但我不知道怎么做。。。

我试着在开始游戏函数中插入ball = Ball(canvas, paddle, "red")，但这将绘制一个新球并将旧球保持在底部。。。