弹球效果预览

解析代码

弹球

Ball 类

draw负责移动Ball 碰撞检测，反弹，Ball检测Paddle

2.Paddle类

draw负责移动Paddle 碰撞检测，确定能不能继续 监听键盘事件

3.主循环

绘制Ball和Paddle update sleep

代码图

调试

我们可以看到小球太小不太好控制,可以看到Ball类里有个方法: self.id = canvas.create_oval(18, 18, 25, 25, fill=color) 我们在看下源码: 可以看到我们在这里是使用这个方法的2个坐标(左上角和右下角的坐标),制作一个椭圆. ok,这样就比较好控制了,哈哈哈哈哈哈.

draw方法

我们的ball和paddle类都有这个draw方法,里面有个重要的方法. 看下源码: 就是:返回给定事件的坐标列表

源码分享

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(60, 60, 180, 180, fill=color) self.canvas.move(self.id, 245, 100) startx = [-3, -2, -1, 1, 2, 3] random.shuffle(startx) self.x = startx[0] self.y = -3 self.canvas_height = self.canvas.winfo_height() self.canvas_width = self.canvas.winfo_width() self.hit_bottom = False def draw(self): self.canvas.move(self.id, self.x, self.y) pos = self.canvas.coords(self.id)#top-left bottom-right if (pos[1] <= 0 or self.hit_paddle(pos) == True): self.y = -self.y if (pos[0] <= 0 or pos[2] >= self.canvas_width): self.x = -self.x if (pos[3] >= self.canvas_height): self.hit_bottom = True 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 class Paddle: def __init__(self, canvas, color): self.canvas = canvas self.id = canvas.create_rectangle(0, 0, 100, 10, fill = color) self.x = 0 self.canvas.move(self.id, 200, 300) self.canvas_width = self.canvas.winfo_width() self.canvas.bind_all("<Key-Left>", self.turn_left) self.canvas.bind_all("<Key-Right>", self.turn_right) def draw(self): pos = self.canvas.coords(self.id) if (pos[0] + self.x >= 0 and pos[2] + self.x <= self.canvas_width): self.canvas.move(self.id, self.x, 0) #self.x = 0 def turn_left(self, event): self.x = -4 def turn_right(self, event): self.x = 4 tk = Tk() tk.title("Game") tk.resizable(0, 0)#not resizable tk.wm_attributes("-topmost", 1)#at top canvas = Canvas(tk, width = 500, height = 500, bd = 0, highlightthickness = 0) canvas.pack() tk.update()#init 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)