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# --- Import libraries used for this program

import math
import pygame
import random

# Define some colors
black = (0,0,0)
white = (255,255,255)

# This class represents the ball        
# It derives from the "Sprite" class in Pygame
class Ball(pygame.sprite.Sprite):
    # Speed in pixels per cycle
    speed = 0
    
    # Floating point representation of where the ball is
    x = 0
    y = 0
    
    # Direction of ball in degrees
    direction = 0
    
    # Height and width of the ball
    width = 10
    height = 10
    
    # Constructor. Pass in the color of the block, and its x and y position
    def __init__(self):
        # Call the parent class (Sprite) constructor
        pygame.sprite.Sprite.__init__(self)
        
        # Create the image of the ball
        self.image = pygame.Surface([self.width, self.height])
        
        # Color the ball
        self.image.fill((white))
        
        # Get a rectangle object that shows where our image is
        self.rect = self.image.get_rect()
        
        # Get attributes for the height/width of the screen
        self.screenheight = pygame.display.get_surface().get_height()
        self.screenwidth = pygame.display.get_surface().get_width()
        
        # Set the initial ball speed and position
        self.reset()
        
    def reset(self):
        self.x = random.randrange(50,750)
        self.y = 350.0
        self.speed=8.0

        # Direction of ball (in degrees)
        self.direction = random.randrange(-45,45)
        
        # Flip a 'coin'
        if random.randrange(2) == 0 :
            # Reverse ball direction, let the other guy get it first
            self.direction += 180
            self.y = 50
        
    # This function will bounce the ball off a horizontal surface (not a vertical one)
    def bounce(self,diff):
        self.direction = (180-self.direction)%360
        self.direction -= diff
        
        # Speed the ball up
        self.speed *= 1.1
    
    # Update the position of the ball
    def update(self):
        # Sine and Cosine work in degrees, so we have to convert them
        direction_radians = math.radians(self.direction)
        
        # Change the position (x and y) according to the speed and direction
        self.x += self.speed * math.sin(direction_radians)
        self.y -= self.speed * math.cos(direction_radians)
        
        if self.y < 0:
            self.reset()
            
        if self.y > 600:
            self.reset()
            
        # Move the image to where our x and y are
        self.rect.x = self.x
        self.rect.y = self.y
        
        # Do we bounce off the left of the screen?
        if self.x <= 0:
            self.direction = (360-self.direction)%360
            print(self.direction)
            #self.x=1
            
        # Do we bounce of the right side of the screen?
        if self.x > self.screenwidth-self.width:
            self.direction = (360-self.direction)%360
               
# This class represents the bar at the bottom that the player controls
class Player(pygame.sprite.Sprite):
    # Constructor function
    def __init__(self, joystick, y_pos):
        # Call the parent's constructor
        pygame.sprite.Sprite.__init__(self)
        
        self.width=75
        self.height=15
        self.image = pygame.Surface([self.width, self.height])
        self.image.fill((white))
        self.joystick = joystick
        
        # Make our top-left corner the passed-in location.
        self.rect = self.image.get_rect()
        self.screenheight = pygame.display.get_surface().get_height()
        self.screenwidth = pygame.display.get_surface().get_width()

        self.rect.x = 0
        self.rect.y = y_pos
    
    # Update the player
    def update(self):
        
        # This gets the position of the axis on the game controller
        # It returns a number between -1.0 and +1.0
        horiz_axis_pos= self.joystick.get_axis(0)
         
        # Move x according to the axis. We multiply by 15 to speed up the movement.
        self.rect.x=int(self.rect.x+horiz_axis_pos*15)
                
        # Make sure we don't push the player paddle off the right side of the screen
        if self.rect.x > self.screenwidth - self.width:
            self.rect.x = self.screenwidth - self.width

score1 = 0
score2 = 0

# Call this function so the Pygame library can initialize itself
pygame.init()

# Create an 800x600 sized screen
screen = pygame.display.set_mode([800, 600])

# Set the title of the window
pygame.display.set_caption('Pong')

# Enable this to make the mouse disappear when over our window
pygame.mouse.set_visible(0)

# This is a font we use to draw text on the screen (size 36)
font = pygame.font.Font(None, 36)

# Create a surface we can draw on
background = pygame.Surface(screen.get_size())

# Create the ball
ball = Ball()
# Create a group of 1 ball (used in checking collisions)
balls = pygame.sprite.Group()
balls.add(ball)

# Count the joysticks the computer has
joystick_count = pygame.joystick.get_count()
if joystick_count < 1:
    # No joysticks!
    print ("Error, I didn't find enough joysticks.")
else:
    # Use joystick #0 and initialize it
    joystick1 = pygame.joystick.Joystick(0)
    joystick1.init()
    joystick2 = pygame.joystick.Joystick(1)
    joystick2.init()
    
# Create the player paddle object
player1 = Player(joystick1,580)
player2 = Player(joystick2,25)

movingsprites = pygame.sprite.Group()
movingsprites.add(player1)
movingsprites.add(player2)
movingsprites.add(ball)

clock = pygame.time.Clock()
done = False
exit_program = False

while exit_program != True:
    clock.tick(30)
    
    # Clear the screen
    screen.fill(black)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            exit_program = True
    
    # Stop the game if there is an imbalance of 3 points
    if abs(score1 - score2) > 3:
        done = True
        
    if not done:
        # Update the player and ball positions
        player1.update()
        player2.update()
        ball.update()
    
    # If we are done, print game over
    if done:
        text = font.render("Game Over", 1, (200, 200, 200))
        textpos = text.get_rect(centerx=background.get_width()/2)
        textpos.top = 50
        screen.blit(text, textpos)
    
    # See if the ball hits the player paddle
    if pygame.sprite.spritecollide(player1, balls, False):
        # The 'diff' lets you try to bounce the ball left or right depending where on the paddle you hit it
        diff = (player1.rect.x + player1.width/2) - (ball.rect.x+ball.width/2)
        
        # Set the ball's y position in case we hit the ball on the edge of the paddle
        ball.y = 570
        ball.bounce(diff)
        score1 += 1
    
    # See if the ball hits the player paddle
    if pygame.sprite.spritecollide(player2, balls, False):
        # The 'diff' lets you try to bounce the ball left or right depending where on the paddle you hit it
        diff = (player2.rect.x + player2.width/2) - (ball.rect.x+ball.width/2)
        
        # Set the ball's y position in case we hit the ball on the edge of the paddle
        ball.y = 40
        ball.bounce(diff)
        score2 += 1
    
    # Print the score
    scoreprint = "Player 1: "+str(score1)
    text = font.render(scoreprint, 1, white)
    textpos = (0,0)
    screen.blit(text, textpos)

    scoreprint = "Player 2: "+str(score2)
    text = font.render(scoreprint, 1, white)
    textpos = (300,0)
    screen.blit(text, textpos)
    
    # Draw Everything
    movingsprites.draw(screen)
    
    # Update the screen
    pygame.display.flip()

pygame.quit()