1 from Tkinter import *

     2 

     3 import string

     4 

     5 

     6 class Pong(Frame):

     7     def createWidgets(self):

     8         self.QUIT = Button(self, text='QUIT', foreground='red',

     9                            command=self.quit)

    10         self.QUIT.pack(side=LEFT, fill=BOTH)

    11 

    12         ## The playing field

    13         self.draw = Canvas(self, width="5i", height="5i")

    14 

    15         ## The speed control for the ball

    16         self.speed = Scale(self, orient=HORIZONTAL, label="ball speed",

    17                            from_=-100, to=100)

    18 

    19         self.speed.pack(side=BOTTOM, fill=X)

    20 

    21         # The ball

    22         self.ball = self.draw.create_oval("0i", "0i", "0.10i", "0.10i",

    23                                           fill="red")

    24         self.x = 0.05

    25         self.y = 0.05

    26         self.velocity_x = 0.3

    27         self.velocity_y = 0.5

    28 

    29         self.draw.pack(side=LEFT)

    30 

    31     def moveBall(self, *args):

    32         if (self.x > 5.0) or (self.x < 0.0):

    33             self.velocity_x = -1.0 * self.velocity_x

    34         if (self.y > 5.0) or (self.y < 0.0):

    35             self.velocity_y = -1.0 * self.velocity_y

    36 

    37         deltax = (self.velocity_x * self.speed.get() / 100.0)

    38         deltay = (self.velocity_y * self.speed.get() / 100.0)

    39         self.x = self.x + deltax

    40         self.y = self.y + deltay

    41 

    42         self.draw.move(self.ball,  "%ri" % deltax, "%ri" % deltay)

    43         self.after(10, self.moveBall)

    44 

    45     def __init__(self, master=None):

    46         Frame.__init__(self, master)

    47         Pack.config(self)

    48         self.createWidgets()

    49         self.after(10, self.moveBall)

    50 

    51 

    52 game = Pong()

    53 

    54 game.mainloop()