Bouncing Ball Program with Tkinter

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Bouncing Ball Program with Tkinter

Postby costigan555 » Wed Apr 23, 2014 12:36 am

I am new to the forum just as much as I am new to programming with Python. However, I have experience with C++, but this is my first time jumping into object-oriented. I would like to learn all of the basics and everything so I am working on a program that has balls that will bounce off of each other as well as the walls. I was hoping to get some help with that and I will attach the code I already have. Thanks in advance.
Code: Select all
from Tkinter import *
import math
import random

class Jumper:

    def __init__(self, x, y):

        self.x = x
        self.y = y

        self.xChange = 0
        self.yChange = 0

        self.jumping = False
        self.startJumping = False

    def jump(self):

        self.startJumping = True

    def move(self):

        self.x += self.xChange
        self.y += self.yChange

        if self.startJumping:
            self.xChange =  0
            self.yChange -= 10

            self.startJumping = False

            self.jumping = True

        elif self.jumping:

            self.yChange += 0.2

            #self.jumping = False

class Game:

    def __init__(self): = Tk()

        self.canvas = Canvas(, width=500, height=500)
        self.jumper   = Jumper()
        self.jumperId = self.canvas.create_oval(245, 490, 255, 500)
        self.jumper.x = 250
        self.jumper.y = 495

        self.jumper.xChange = 0
        self.jumper.yChange = -3

        self.victim   = Jumper()
        self.victimId = self.canvas.create_oval(245, 245, 255, 255, fill='red')
        self.victim.x = 250
        self.victim.y = 250
        self.screenItems = {}

        self.screenItems[self.jumper] = self.jumperId
        self.screenItems[self.victim] = self.victimId

        self.canvas.bind_all('<KeyPress-space>', self.jump)

        self.screenItems = {}
        for i in range(20):

            x = random.randint(50, 450)
            y = random.randint(50, 450)

            j = Jumper(x, y)

            self.screenItems[j] = self.canvas.create_oval(x-5, y-5, x+5, y+5, fill='red')

            if i < 9:

                j.xChange = random.randint(-4, 4)
                j.yChange = random.randint(-4, 4)

    def jump(self, event):

    def detectCollision(self, left, right):

        if (math.sqrt( (right.x - left.x)**2 + (right.y - left.y)**2 ) < 10):

            theta = math.atan2( right.y - left.y, right.x - left.x )

            right.xChange = math.cos(theta) * ( math.sqrt(left.xChange**2 + left.yChange**2) )
            right.yChange = math.sin(theta) * ( math.sqrt(left.xChange**2 + left.yChange**2) )

            left.xChange = 0
            left.yChange = 0

    def run(self):
        while True:




            self.detectCollision(self.jumper, self.victim)


        while True:

            for item in self.screenItems:


                self.canvas.move(self.screenItems[item], item.xChange, item.yChange)


            for item in self.screenItems:

                for otherItem in self.screenItems:

                    if item != otherItem:

                        self.detectCollision(item, otherItem)

The program needed to be improved.
(3.53 KiB) Downloaded 42 times
Last edited by micseydel on Wed Apr 23, 2014 12:42 am, edited 1 time in total.
Reason: Locked OP, added code in code tags (from OP-provided attachment).
Posts: 2
Joined: Wed Apr 23, 2014 12:30 am

Re: Bouncing Ball Program with Tkinter

Postby micseydel » Wed Apr 23, 2014 12:51 am

Hello, welcome to the forum! Make sure to give this a read over before making more posts.

Most specifically, do you have a specific question or problem, or are you looking for general feedback?

My advice, that you don't necessarily need to follow, is to learn OOP before a GUI library such as Tkinter, rather than both at the same time. I say this because neither is trivial, and in programming and science it's easier to start to understand something new with fewer simultaneous variables. That, and I personally basically ignore anything with GUI code... so if you have any pure-OOP questions, I would separate them from your GUI code and post that code in a different subforum (I've moved your code to the GUI subforum). It's a good general rule anyway since posting the smallest runnable code that reproduces your problem makes it easier for us to help you ;)
Join the #python-forum IRC channel on!

Please do not PM members regarding questions which are meant to be discussed publicly. The point of the forum is so that others can benefit from it. We don't want to help you over PMs or emails.
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Re: Bouncing Ball Program with Tkinter

Postby wuf » Wed Apr 23, 2014 12:39 pm

Posts: 50
Joined: Fri Feb 08, 2013 6:42 am

Re: Bouncing Ball Program with Tkinter

Postby costigan555 » Wed Apr 23, 2014 11:31 pm

Thanks. That really helped a lot.
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