## Right_left_screen_collision_detection.py

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## Code Snippet

``````#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"""
"""

"""

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]
random.shuffle(starting_position)
self.x = starting_position[0]
self.y = -3
self.canvas_height=self.canvas.winfo_height()
self.canvas_width=self.canvas.winfo_width() #for left right detection we need the width of the canvas as well.

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

if pos[1] <=0:
self.y=6 #increase or decrease for the speed (up and down) and do the same for the x values
if pos[3] >=self.canvas_height:
self.y=-6
#THIS PART CHECKS FOR THE RIGHT AND LEFT COLLISION DETECTION SO THAT THE BALL BOUNCES ON ALL WALLS
if pos[0] <=0:
self.x=6
if pos[2]>=self.canvas_width:
self.x=-6

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()
time.sleep(0.02) # experiment with these values to see what happens to the speed of the ball
main()

``````