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===============
Experiment with the bouncing angle and speed
"""

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
        self.x=0 #set the object variable x to 0 (don't move the ball horizontally)
        self.y=-1 #set the object variable y to -1 (this means keep moving the ball UP on initilisation)
        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): #to make the ball BOUNCE we change the draw function
        self.canvas.move(self.id,self.x,self.y) #change the call to the canvas's move function by passing the object variables x and y
        pos=self.canvas.coords(self.id) #create a variable called pos for position - do this by calling the canvas function coordinates
        #The above function would return the current x and y coordinates of anything drawn on the canvas as long as you know the identifying number
        #In this case it is the oval's identifier (self.id) that gives us the coordinates
        """ About the Coordinates
         1. coords function returns the coordinates as a list of four numbers
         [a,b,c,d] (e.g. 255,20,280,50)
         First two numbers = top left coordinates of the oval that are x1 and y1
         Last two numbers = bottom right x2 and y2 coordinates
        """

        if pos[1] <=0: #if you hit the top of the screen then stop subtracting 1 as defined in the __init__ method and therefore stop moving up -reverse directions
            self.y=1
        if pos[3] >=self.canvas_height: #if the bottom coordinates are greater or equal to canvas height, then reverse again, and set y back to -1 (go up)
            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(0.01)
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	Describe your test here. Is it a valid, valid-extreme,invalid, invalid extreme, or borderline test?
2
3
4
5

Coming soon!