Pong The Python Game

Pong Game

# Implementation of classic arcade game Pong

import simplegui
import random

# initialize globals - pos and vel encode vertical info for paddles
WIDTH = 600
HEIGHT = 400       
BALL_RADIUS = 20
PAD_WIDTH = 8
PAD_HEIGHT = 80
HALF_PAD_WIDTH = PAD_WIDTH / 2
HALF_PAD_HEIGHT = PAD_HEIGHT / 2
LEFT = False
RIGHT = True

# initialize ball_pos and ball_vel for new bal in middle of table
# if direction is RIGHT, the ball's velocity is upper right, else upper left

def spawn_ball(direction):
    global ball_pos, ball_vel # these are vectors stored as lists

    global LEFT,RIGHT
    ball_pos = [WIDTH/2,HEIGHT/2]
    ball_vel = [0,0]
    if direction == 1: 
        LEFT = False
        RIGHT = True
     
    elif direction == 0:
        
        LEFT = True 
        RIGHT = False
    
    if (LEFT == False and RIGHT==True) :
        ball_vel=[random.randrange(3, 6),-random.randrange(1, 3)]
    elif (LEFT==True and RIGHT == False):
        ball_vel=[-random.randrange(3,4),-random.randrange(2, 4)]
    

# define event handlers
def new_game():
    global paddle1_pos, paddle2_pos, paddle1_vel, paddle2_vel  # these are numbers
    global score1, score2  # these are ints
    global paddle1_pos, paddle2_pos, paddle1_vel, paddle2_vel  # these are numbers
    global score1, score2  # these are ints
    
    paddle1_pos = [PAD_WIDTH/2, (HEIGHT-PAD_HEIGHT) / 2]
    paddle2_pos = [WIDTH - PAD_WIDTH/2,PAD_HEIGHT / 2]
    paddle1_vel = 0
    paddle2_vel = 0
    score1 = 0
    score2 = 0
    spawn_ball(random.randrange(2))
#helper function to turn score 1 and 2 as strings
def display_score1():
    global score1
    return str(score1)
def display_score2():
    global score2
    return str(score2)
# helper funcction to update the position of the ball
def ball_Position():
    global ball_pos, ball_vel
    ball_pos[0]+=ball_vel[0]
    ball_pos[1]+=ball_vel[1]
#helper function to prevent the ball from bouncing off the canvas in the y direction
def keep_track_of_y_direction():
    global ball_pos, ball_vel
    if ball_pos[1] <= BALL_RADIUS:
        ball_vel[1] = - ball_vel[1]
    elif ball_pos[1] >= (HEIGHT - BALL_RADIUS):
        ball_vel[1] = - ball_vel[1]
#helper function to check and update paddle position
def update_paddle_position():
    global paddle1_pos, paddle2_pos, paddle1_vel, paddle2_vel
    if 	(paddle1_pos[1] + paddle1_vel)>=0 and(paddle1_pos[1] + paddle1_vel) <= HEIGHT - PAD_HEIGHT:
        paddle1_pos[1] += paddle1_vel
    
    if 	(paddle2_pos[1] + paddle2_vel)>=0 and(paddle2_pos[1] + paddle2_vel) <= HEIGHT - PAD_HEIGHT:
        paddle2_pos[1] += paddle2_vel
    
        
    
def draw(canvas):
    global score1, score2, paddle1_pos, paddle2_pos, ball_pos, ball_vel
    
        
    # draw mid line and gutters
    canvas.draw_line([WIDTH / 2, 0],[WIDTH / 2, HEIGHT], 1, "White")
    canvas.draw_line([PAD_WIDTH, 0],[PAD_WIDTH, HEIGHT], 1, "White")
    canvas.draw_line([WIDTH - PAD_WIDTH, 0],[WIDTH - PAD_WIDTH, HEIGHT], 1, "White")
        
    # update ball
    if (ball_pos[0]<=BALL_RADIUS + PAD_WIDTH):
        if (ball_pos[1]>=paddle2_pos[1] and ball_pos[1]<=(paddle2_pos[1] + PAD_HEIGHT)):
            ball_vel[0] = -ball_vel[0]*1.1
        else :
            spawn_ball(1)
            score2 = score1+1
        
    elif ball_pos[0] >= (WIDTH - BALL_RADIUS - PAD_WIDTH):
        if (ball_pos[1]>=paddle1_pos[1] and ball_pos[1]<=(paddle1_pos[1] + PAD_HEIGHT)):
            ball_vel[0] = -ball_vel[0]*1.1
        else :
            spawn_ball(0)
            score1 = score1+1
        
            
    ball_Position()
    keep_track_of_y_direction()
    
    
      
    # draw ball
    canvas.draw_circle(ball_pos, BALL_RADIUS, 0.1, "Yellow", "Yellow")
    # update paddle's vertical position, keep paddle on the screen
    
    update_paddle_position()
    # draw paddles
    canvas.draw_line([paddle1_pos[0], paddle1_pos[1]],[PAD_WIDTH/2,paddle1_pos[1]+ PAD_HEIGHT], PAD_WIDTH, "Red")
    canvas.draw_line([paddle2_pos[0], paddle2_pos[1]],[WIDTH- PAD_WIDTH/2, paddle2_pos[1]+PAD_HEIGHT], PAD_WIDTH, "Red")
    
    # determine whether paddle and ball collide    
    
    # draw scores
    canvas.draw_text(display_score1(), (185, 40), 40, "Red")
    canvas.draw_text(display_score2(), (400, 40), 40, "Red")       
def keydown(key):
    global paddle1_vel, paddle2_vel
    paddle1_acc = 2
    paddle2_acc= 2
    
    if key==simplegui.KEY_MAP["s"]:
        paddle1_vel += paddle1_acc 
    if key==simplegui.KEY_MAP["up"]:
        paddle2_vel -= paddle2_acc 
    if key==simplegui.KEY_MAP["w"]:
        paddle1_vel -= paddle1_acc 
    if key == simplegui.KEY_MAP["down"]: 
        paddle2_vel += paddle2_acc 
def keyup(key):
    global paddle1_vel, paddle2_vel
    paddle_acc =2
    
    if key==simplegui.KEY_MAP["w"]:
        paddle1_vel = 0
    if key==simplegui.KEY_MAP["down"]:
        paddle2_vel = 0 
    if key==simplegui.KEY_MAP["s"]:
        paddle1_vel = 0
     
    if key == simplegui.KEY_MAP["up"]:
        paddle2_vel = 0  
def restart():
    new_game()

# create frame

frame = simplegui.create_frame("Pong", WIDTH, HEIGHT)
frame.add_button("Restart",restart)
frame.set_draw_handler(draw)
frame.set_keydown_handler(keydown)
frame.set_keyup_handler(keyup)


# start frame
new_game()
frame.start()