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
""" Task: Can you draw what is happening between the ball and the bat and explain the collision detection in your own words? NOTE OF POSITIONS ball pos [0] Top left coordinate x1 ball pos [1] Top left coordinate y1 ball pos [2] Bottom right coordinate x2 ball pos [3] Bottom right coordinate y2 bat pos [0] Top left coordinate x1 bat pos [1] Top left coordinate y1 bat pos [2] Bottom right coordinate x2 bat pos [3] Bottom right coordinate y2 """ from tkinter import * import random import time class Ball: def __init__(self,canvas,bat,color): #change the __init__function in class Ball to pass in the bat object as a parameter self.canvas=canvas self.bat=bat #here we assign the bat parameter to the object variable bat self.id=canvas.create_oval(30,30,50,50,fill=color) self.canvas.move(self.id,100,200) 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() #Create the hit_bat function def hit_bat(self,pos): bat_pos=self.canvas.coords(self.bat.id) #retrieve the coordinates of the bat position - note the ball coordinates are being passed if pos[2] >=bat_pos[0] and pos[0] <=bat_pos[2]: #if the right side of the ball (that is the x right hand coordinate) is greater than the left side of the bat, AND the left side of the ball is less than the right side of the bat ....move etc if pos[3]>=bat_pos[1] and pos[3] <= bat_pos[3]: #if the bottom of the ball (pos[3]) is between the paddle's top [bat pos[1]) and bottom (pos[3]) return True return False 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 if pos[3] >=self.canvas_height: self.y=-6 #Call the hit_bat function if self.hit_bat(pos) ==True: #if the hit_bat function returns a value of True, the direction of the ball is changed self.y=-6 #if the ball hits the bat, then send the ball flying up at a rate of -6 (higher the number the faster the fly!) if pos[0] <=0: self.x=6 if pos[2]>=self.canvas_width: self.x=-6 class Pongbat(): def __init__(self,canvas,color): self.canvas=canvas self.id=canvas.create_rectangle(0,0,100,10,fill=color) self.canvas.move(self.id,200,300) self.x=0 self.canvas_width=self.canvas.winfo_width() self.canvas.bind_all('',self.left_turn) self.canvas.bind_all(' ',self.right_turn) def draw(self): self.canvas.move(self.id,self.x,0) pos=self.canvas.coords(self.id) if pos[0]<=0: self.x=0 if pos[2]>=self.canvas_width: self.x=0 def left_turn(self,evt): self.x=-10 def right_turn(self,evt): self.x=10 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() bat1=Pongbat(canvas,'red') #this has to be created first, otherwise it will not recognise the call to the bat parameter in the next statement ball1=Ball(canvas,bat1, 'green') #change this so that it includes the bat parameter (we included it in the ball's __init__method while 1: tk.update() ball1.draw() bat1.draw() time.sleep(0.02) main() #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"""
A sample flow chart (design) for this particular challenge could look like:
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