PongTutorial-3

from tkinter import *
import time, random

class Game:
    def __init__(self):
        self.tk = Tk()
        self.tk.title("Pong tutorial")
        self.tk.resizable(0,0)
        self.tk.wm_attributes("-topmost", 1)
        self.canvas = Canvas(self.tk, width=500, height=500)
        self.canvas.pack()
        self.score = 0
        self.scoretext = self.canvas.create_text(0, 0, anchor="nw", text="Score: {0}".format(self.score), font="Purisa 20 bold", fill="red")
    def mainloop(self):
        while True:
            b.draw()
            p.draw()
            self.tk.update()
            time.sleep(0.01)

class Ball:
    def __init__(self, game, paddle):
        self.tk = game
        self.id = self.tk.canvas.create_oval(20, 20, 38, 38, fill="red")
        l = [-3, -2, -1, 1, 2, 3]
        x = random.choice(l)
        self.x, self.y = x,-3
        self.paddle = paddle
    def draw(self):
        self.tk.canvas.move(self.id, self.x, self.y)
        pos = self.tk.canvas.coords(self.id) #[x, y, x1, y1]
        if pos[0] <= 0: #x
            self.x = 3
        elif pos[1] <= 0: #y
            self.y = 3
        elif pos[2] >= 500: #x1
            self.x = -3
        elif pos[3] >= 500: #y1
            self.y = 0 #GAME OVER
            self.x = 0
        elif self.hit_paddle():
            self.tk.score += 1
            self.tk.canvas.itemconfig(self.tk.scoretext, text="Score: {0}".format(self.tk.score))
            self.tk.tk.update()
            self.y = -3
    def hit_paddle(self):
        pos = self.tk.canvas.coords(self.id)
        paddle_pos = self.tk.canvas.coords(self.paddle.id)
        if pos[2] >= paddle_pos[0] and pos[0] <= paddle_pos[2]: #collision between x axis
            if pos[3] >= paddle_pos[1] and pos[3] <= paddle_pos[3]: #collision between y axis
                return True
        return False

class Paddle:
    def __init__(self, game):
        self.tk = game
        self.id = self.tk.canvas.create_rectangle(0, 0, 100, 10, fill="blue")
        self.tk.canvas.move(self.id, 200, 400)
        self.x, self.y = 0, 0
        self.tk.canvas.bind_all("<KeyPress-Right>", self.right)
        self.tk.canvas.bind_all("<KeyPress-Left>", self.left)
    def draw(self):
        self.tk.canvas.move(self.id, self.x, self.y)
    def left(self, event):
        pos = self.tk.canvas.coords(self.id)
        self.x = -2
    def right(self, event):
        pos = self.tk.canvas.coords(self.id)
        self.x = 2

if __name__ == "__main__":
    g = Game()
    p = Paddle(g)
    b = Ball(g, p)
    g.mainloop()