## ~ OOP,Classes,Python,Tkinter ...recreating PONG

### Code and Challenge

Copy and paste the code below. Run it! Read the task and see if you can do it before moving on to the next challenge

```#note - an ERROR may be caused as Python is complaining about breaking out of the while loop when the window is closed - you can ignore that for now (or a fix is provied in the solutions section for those who are interested"""
"""
==========Task===============
Change the starting values in the list and experiment with them
"""

from tkinter import *
import random
import time

class Ball:
def __init__(self,canvas,color):
self.canvas=canvas
self.id=canvas.create_oval(30,30,50,50,fill=color)
self.canvas.move(self.id,100,200)

#ADD THESE LINES TO OUR __INIT__ METHOD
starting_position=[-3,-2,-1,1,2,3] #create a list with various possible starting positions
random.shuffle(starting_position) #mix them up with the random shuffle function
self.x = starting_position[0] #set the value of x to the first item in the list - this means x can be any value in the list from -3 to 3
self.y = -3 #changing y to -3 will simply increase the rate at which it moves along y (increases the speed)
self.canvas_height=self.canvas.winfo_height() #set the canvas height by calling the canvas function winfo_height (it gives us the current canvas height)

def draw(self):
self.canvas.move(self.id,self.x,self.y)
pos=self.canvas.coords(self.id)

if pos[1] <=0:
self.y=1
if pos[3] >=self.canvas_height:
self.y=-1

def main():
tk=Tk()
tk.title("My 21st Century Pong Game")
tk.resizable(0,0)
tk.wm_attributes("-topmost",1)
canvas=Canvas(tk,bg="white",width=500,height=400,bd=0,highlightthickness=0)
canvas.pack()
tk.update()

ball1=Ball(canvas,'green')
while 1:
tk.update()
ball1.draw() #call the ball draw method here
time.sleep(0.05)
main()

```

### Code your solution here

Systems Life Cycle (in a nutshell): Analyse - Design - Create - Test - Evaluate. Designing something or writing out some pseudocode before you actually write code is always a good idea! Get in to the habit of doing so! You can draw your flowchart here and screenshot it.

A sample flow chart (design) for this particular challenge could look like:

Each challenge section below provides an online drawing tool where you can dynamically create flowcharts. Screenshot them into your presentation for submission.

### Solutions & Answers

Answers /Solutions in the "members area" drive under: "Solve and Learn >>SOLUTIONS"

### Testing Table

You may want to read a little about Testing first. A teacher may go through some examples with you. Feel free to fill in the test table here, and screenshot it in to your powerpoint. Testing is absolutely essential once you have created a program!
Test No. Description Test Data(input) Expected Outcome Actual Outcome Further Action?
1
2
3
4
5
Coming soon!