Dear John,
Thanks for your help. I don't know how to bind the ball only into a
program. Would you mind help me on this? I added the changeColour
function, here is a complete program.
---------------------------
from Tkinter import *
import string
class Pong(Frame):
def createWidgets(self):
self.QUIT = Button(self, text='QUIT', foreground='red',
command=self.quit)
self.QUIT.pack(side=LEFT, fill=BOTH)
## The playing field
self.draw = Canvas(self, width="5i", height="5i")
## The speed control for the ball
self.speed = Scale(self, orient=HORIZONTAL, label="ball speed",
from_=-100, to=100)
self.speed.pack(side=BOTTOM, fill=X)
# The ball
self.ball = self.draw.create_oval("0i", "0i", "0.10i", "0.10i",
fill="red")
self.theBall()
self.x = 0.05
self.y = 0.05
self.velocity_x = 0.3
self.velocity_y = 0.5
self.draw.pack(side=LEFT)
def changeColour(self, event):
x = self.draw.canvasx(event.x)
y = self.draw.canvasy(event.y)
item = self.draw.find_closest(x,y)
currentColour = self.draw.itemcget(item, 'fill')
if currentColour == 'red':
self.draw.itemconfigure(item, fill='blue')
else:
self.draw.itemconfigure(item, fill='red')
def moveBall(self, *args):
if (self.x > 5.0) or (self.x < 0.0):
self.velocity_x = -1.0 * self.velocity_x
if (self.y > 5.0) or (self.y < 0.0):
self.velocity_y = -1.0 * self.velocity_y
deltax = (self.velocity_x * self.speed.get() / 100.0)
deltay = (self.velocity_y * self.speed.get() / 100.0)
self.x = self.x + deltax
self.y = self.y + deltay
self.draw.move(self.ball, "%ri" % deltax, "%ri" % deltay)
self.after(10, self.moveBall)
def __init__(self, master=None):
Frame.__init__(self, master)
Pack.config(self)
self.createWidgets()
self.after(10, self.moveBall)
game = Pong()
game.mainloop()
Thanks
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