弹球游戏

1、这里实现一个小球类，考虑了边界碰撞。 

from tkinter import *
import random
import time
class Ball:
    def _init_(self, canvas, color):
        self.canvas = canvas
        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()
    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

tk = Tk()
tk.title("Game")
tk.resizable(0,0)
tk.wm_attributes("-topmost",1)
canvas = Canvas(tk, width=500, height=400, bd=0, highlightthickness=0)
canvas.pack()
tk.update()
ball = Ball()
ball._init_(canvas,'red')
while 1:
    ball.draw()
    tk.update_idletasks()
    tk.update()
    time.sleep(0.01)
    

2、下面创建一个球拍类，考虑了按键控制左右移动以及边界碰撞。

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('<KeyPress-Left>',self.turn_left)
        self.canvas.bind_all('<KeyPress-Right>',self.turn_right)
    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 = -2
    def turn_right(self,evt):
            self.x = 2
paddle = Paddle()
paddle._init_(canvas,'red')
while 1:
    ball.draw()
    paddle.draw()
    tk.update_idletasks()
    tk.update()
    time.sleep(0.01)

3.完整的小程序

from tkinter import *
import random
import time
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[3] <= paddle_pos[3]:
            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 = 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
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('<KeyPress-Left>',self.turn_left)
        self.canvas.bind_all('<KeyPress-Right>',self.turn_right)
        
    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 = -2
    def turn_right(self,evt):
            self.x = 2
            
tk = Tk()
tk.title("Game")
tk.resizable(0,0)
tk.wm_attributes("-topmost",1)
canvas = Canvas(tk, width=500, height=400, bd=0, highlightthickness=0)
canvas.pack()
tk.update()

paddle = Paddle()
paddle._init_(canvas,'red')
ball = Ball()
ball._init_(canvas,paddle,'red')
while 1:
    if ball.hit_bottom == False:
        ball.draw()
        paddle.draw()
    tk.update_idletasks()
    tk.update()
    time.sleep(0.01)