The third stage of the fun Learning Python pinball game

Start letting the ball bounce back and forth in the vertical direction of the canvas.

from tkinter import *import randomimport time# Create Ball class class ball:     def __init__ (Self,canvas,color):                                    #初始化函数, including canvas and color parameters          self.canvas = canvas                                            #把参数canvas赋值给对象变量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)                               #把画好的椭圆形移动的画布中心, graphical ID representation          self.x = 0                                                       #对象变量x就是水平移动的初始值, equivalent to not moving, called in the paint function below          self.y = -1                                                    # The object variable y is the initial value of the vertical movement, which is equivalent to moving up, in the drawing function belowWith         self.canvas_height = self.canvas.winfo_height ()                #获取画布的高度, the height of the canvas is measured from top to bottom                    Def draw (self):                                                     #定义画图动作         self.canvas.move (SELF.ID,SELF.X,SELF.Y)                          #按照x和y定义的步长来移动小球          pos = self.canvas.coords (self.id) &NBSP;&NBSP;&NBSP;&NBsp;                          #coords函数通过id返回画布上画好东西的xy坐标值          if pos[1] <= 0:                                                # POS Returns a list [X1,y1,x2,y2] that represents the XY coordinates of the upper-left and lower-right corners of the ellipse, respectively              self.y = 1                                                  #当球左上角y1坐标小于等于0, The description touches the top of the canvas, re-sets the object variable y to 1, and starts to move vertically downward         if pos[3] >= self.canvas_height:                                #当球右下角y2坐标超过画布高度, reset the object variable y to-1 and start moving vertically up              self.y = -1              #创建游戏的桌布tk  = tk ()                                                                # Create a Tk object with the TK () class, 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)                                          # Tell Tkinter to put the window on the front Canvas = canvas (tk,width=500,heigh=400,bd=0,highlightthickness=0)       #Canvas是一个画布类canvas. Pack () &NBSP;&NBSP;&Nbsp;                                                       # Adjusts its own size according to the width height parameter specified in the previous line tk.update () #画一个红色的球ball  = ball (canvas, ' red ')                                                 #用Ball类在画布上画一个红色的球 # main loop, let Tkinter constantly repaint the screen While 1:    ball.draw ()                                                           #调用Ball类的作画函数      Tk.update_idletasks ()                                                #updata_idletasks和updata这两个命令      tk.update ()                                                           #让tkinter快一点把画布上的东西画出来     time.sleep (0.01)                                                      #延时让动画效果慢一点

The third stage of the fun Learning Python pinball game