The fifth stage of the fun-to-learn Python pinball game-Add a racket

This time, I followed the "Fun learning python--teach children to learn programming", to add a program to use the keyboard around the key control of the racket.

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#引入下列模块from  tkinter import *                                                    #画图模块import  random                                                            #随机数模块import  time                                                              #时间模块 # Create a game window and Canvas tk = tk ()                                                                  #用Tk () class creates a Tk object, which is a basic window on which you can add something else tk.title ("Game")                                                          #给Tk对象窗口加一个标题tk. Resizable (0,0)                                                         #tk窗口大小不可调整tk. Wm_attributes ("-topmost", 1)                                            #告诉tkinter把窗口放到最前面canvas  = canvas (tk,width=500,heigh=400,bd=0,highlightthickness=0)      #Canvas是一个画布类canvas. Pack ()                                                             #按照上面一行指定的宽度高度参数调整其自身大小tk. Update ()                                                               #update强制更新屏幕, re-painting # Create Ball Class class ball:    def __init__ (Self,canvas,color):                                    #初始化函数, including canvas and color parameters          self.canvas = canvas                                           # Assign the parameter canvas to the object variable canvas         self.id = canvas.create_oval (10,10,25,25,fill=color)            #创建椭圆, Upper-left and lower-right XY coordinates, returning id        representing the graphic  self.canvas.move (self.id,245,100)                              # The center of the canvas in which the ellipse (ball) is moved, the graphic is represented by an ID         starts = [-3,-2,-1,1,2,3]                                      # Give the starting value of the X component (x and y represent the horizontal and vertical components)         random.shuffle (starts)                                           #随机混排序, assign a value to the object variable x to get the random component value when it starts. Cause the ball to start at different angles each time         self.x = starts[0]                                               #对象变量x就是水平分量移动的初始值, equivalent to move left and right, the value represents how many pixels to move          self.y = -3                                                    # The object variable y is the initial value of the vertical component movement, which is equivalent to moving up and down, and the value represents how many pixels are moved         self.canvas_height =  self.canvas.winfo_height ()                #获取画布的高度, the canvas height is measured from top to bottom                         self.canvas_width = self.canvas.winfo_width ()                   #获取画布的宽度     def draw (self ):                                                     #定义小球的画图动作          self.canvas.move (SELF.ID,SELF.X,SELF.Y)                        # Move the ball by the pixel values defined by x and Y, such as 3 to move the 3 pixel position &NBSp;        pos = self.canvas.coords (self.id)                                #coords函数通过id返回画布球的坐标列表, Pos[x1,y1,x2,y2], representing the XY coordinates of the lower-right corner of the ellipse, respectively         if pos[1] <= 0:                                                  #当球左上角y1坐标小于等于0, which touches the top of the canvas              self.y = 3                                                  #重新设置对象变量y为3, start the vertical component Move down          if pos[3] >= self.canvas_height:                                #当球右下角y2坐标超过画布高度 (bottom)              self.y = -3                                                # Reset object variable y to-3, start vertical component Move up         if pos[0] <= 0:                                                  #当球左上角x1坐标小于等于0, which touches the left border of the canvas              self.x = 3                                                 # Reset object variable x to 3, start horizontal component Move right         if pos[2] >=  self.canvas_width:                                #当球右下角x2坐标超过画布有边框             self.x = -3                                                  #重新设置对象变量x为-3, start horizontal component Move left # Create paddle class class paddle:    def __init__ (self, Canvas,color):                                   #初始化函数, Contains canvas and color parameters         self.canvas = canvas                                             #把参数canvas赋值给对象变量canvas         self.id =  Canvas.create_rectangle (0, 0,100,10,fill=color)       #创建长方形, upper-left and lower-right XY coordinates, returning id      representing the graphic    self.canvas.move (self.id,200,300)                                The initial position of the #把长方形 (beat) movement, the graph is represented by the ID         self.x = 0                                                       #设置对象变量x, with an initial value of 0. That is, the graph does not move first          self.canvas_width = self.canvas.winfo_width ()                   #获取画布的宽度         &Nbsp;self.canvas.bind_all (' <KeyPress-Left> ', self.turn_left)        # Initialize event ' Press left key ' and function left to move binding         self.canvas.bind_all (' <keypress-right > ', self.turn_right)       #初始化时将事件 ' press right ' and the function to move the binding to the right              def turn_left (SELF,EVT):                                           # Define a function that moves the beat to the left         self.x = -2                                                      #每次向左移动2个像素, more and more left on the canvas, the values are getting smaller, so a negative number is required         def  turn_right (SELF,EVT):                                           #定义使拍子向右移动的函数          self.x = 2                                                       #每次向右移动2个像素, more and more to the right on the canvas, the values are getting bigger, so you need a positive number              def draw (self):                                                     #定义拍子的画图动作          self.canvas.move (self.id,self.x,0)                               #和小球配置大致相同, the paint move moves only around the horizontal, so the Y component is set to 0        pos =  Self.canvas.coords (self.id)                               #获取拍子的左上和右下角坐标值         if pos[0] <= 0:                                                # If the upper-left corner of the horizontal component x, that is, the left side of the beat has reached the left border             self.x =  0                                                  #拍子不像小球一样需要自动回弹, so set the horizontal component x to 0, i.e. let it stop moving         elif pos[2] >= self.canvas_width:                               #如果右下角水平分量x, i.e. the right side of the beat has reached the right border              self.x = 0                                                  #同样设置为0, Stop movement # Draw a small ball and beat Ball = ball (canvas, ' red ')                                               # Draw a red ball on the canvas with balls paddle = paddle (canvas, ' Blue ')                                           #用Paddle类在画布上画一个蓝色的拍子                                           #主循环, let Tkinter continue to redraw the screen while 1:     ball.draw ()                                                           #调用Ball类的作画函数     paddle.draw ()                                                         #调用Paddle类的作画函数      Tk.update_idletasks ()                                                #updata_idletasks和updata这两个命令     tk.update ()                                                         # Get Tkinter to paint something on the canvas.     time.sleep (0.01)                                                      #延时让动画效果慢一点

The fifth stage of the fun-to-learn Python pinball game-Add a racket