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pong.py
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pong.py
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# 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
player1_points = 0
player2_points = 0
paddle1_pos = 200
paddle2_pos = 80
paddle1_vel = 0
paddle2_vel = 0
ball_pos = [WIDTH / 2,HEIGHT / 2]
ball_vel = [1,1]
player1_press = 0
player2_press = 0
# 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
ball_pos = [WIDTH / 2, HEIGHT / 2]
if(direction == 'LEFT'):
ball_vel[0] = -1 * (random.randrange(120, 240) / 60)
ball_vel[1] = -1 * (random.randrange(60, 180) / 60)
else:
ball_vel[0] = +1 * (random.randrange(120, 240) / 60)
ball_vel[1] = -1 * (random.randrange(60, 180) / 60)
# 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 counter
global player1_points, player2_points
ball_pos = [WIDTH / 2, HEIGHT / 2]
spawn_ball('LEFT')
player1_points = 0
player2_points = 0
def timer_handler():
global player1_press, player2_press
global paddle1_vel, paddle2_vel
if(player1_press == 1 or player1_press == -1):
paddle1_vel = paddle1_vel + player1_press
if(player2_press == 1 or player2_press == -1):
paddle2_vel = paddle2_vel + player2_press
def collision_detection():
global ball_vel
global player1_points, player2_points
if(ball_pos[0] + BALL_RADIUS >= WIDTH - PAD_WIDTH):
if(ball_pos[1] <= paddle2_pos and ball_pos[1] >= paddle2_pos - PAD_HEIGHT):
print "hit right paddle"
ball_vel[0] = -ball_vel[0]
ball_vel[0] = ball_vel[0] + ball_vel[0] / 10
else:
print "miss right paddle"
player1_points = player1_points + 1
spawn_ball('LEFT')
elif(ball_pos[0] - BALL_RADIUS <= PAD_WIDTH):
if( (ball_pos[1] <= paddle1_pos) and (ball_pos[1] >= paddle1_pos - PAD_HEIGHT)):
ball_vel[0] = -ball_vel[0]
ball_vel[0] = ball_vel[0] + ball_vel[0] / 10
print "hit left paddle"
else:
spawn_ball('RIGHT')
player2_points = player2_points + 1
print "miss left paddle"
def draw(c):
global score1, score2, paddle1_pos, paddle2_pos, ball_pos, ball_vel
# draw mid line and gutters
c.draw_line([WIDTH / 2, 0],[WIDTH / 2, HEIGHT], 1, "White")
c.draw_line([PAD_WIDTH, 0],[PAD_WIDTH, HEIGHT], 1, "White")
c.draw_line([WIDTH - PAD_WIDTH, 0],[WIDTH - PAD_WIDTH, HEIGHT], 1, "White")
# update ball
ball_pos[0] = ball_pos[0] + ball_vel[0]
ball_pos[1] = ball_pos[1] + ball_vel[1]
collision_detection()
#vertical collision test and modify
if((ball_pos[1] + BALL_RADIUS >= HEIGHT) or (ball_pos[1] - BALL_RADIUS <= 0)):
ball_vel[1] = -ball_vel[1]
# draw ball
c.draw_circle(ball_pos ,BALL_RADIUS, 1,"White","White")
# update paddle's vertical position, keep paddle on the screen
if(paddle1_pos + paddle1_vel >= PAD_HEIGHT and paddle1_pos + paddle1_vel <= HEIGHT):
paddle1_pos = paddle1_pos + paddle1_vel
if(paddle2_pos + paddle2_vel >= PAD_HEIGHT and paddle2_pos + paddle2_vel <= HEIGHT):
paddle2_pos = paddle2_pos + paddle2_vel
# draw paddles
c.draw_line([HALF_PAD_WIDTH, paddle1_pos],[HALF_PAD_WIDTH,
paddle1_pos - PAD_HEIGHT],PAD_WIDTH ,"White")
c.draw_line([WIDTH - HALF_PAD_WIDTH , paddle2_pos],[WIDTH - HALF_PAD_WIDTH,
paddle2_pos - PAD_HEIGHT],PAD_WIDTH ,"White")
# draw scores
c.draw_text(str(player1_points), (150, 50), 30, 'White')
c.draw_text(str(player2_points), (450, 50), 30, 'White')
def keydown(key):
global paddle1_vel, paddle2_vel
global player1_press, player2_press
if(int(key) == 87):
paddle1_vel = -1
player1_press = -1
elif(int(key) == 83):
paddle1_vel = +1
player1_press = 1
elif(int(key) == 38):
paddle2_vel = -1
player2_press = -1
elif(int(key) == 40):
paddle2_vel = +1
player2_press = 1
def keyup(key):
global paddle1_vel, paddle2_vel
global player1_press, player2_press
if(int(key) == 87):
paddle1_vel = 0
player1_press = 0
elif(int(key) == 83):
paddle1_vel = 0
player1_press = 0
elif(int(key) == 38):
paddle2_vel = 0
player2_press = 0
elif(int(key) == 40):
paddle2_vel = 0
player2_press = 0
# create frame
frame = simplegui.create_frame("Pong", WIDTH, HEIGHT)
frame.set_draw_handler(draw)
frame.set_keydown_handler(keydown)
frame.set_keyup_handler(keyup)
frame.add_button('reset', new_game,75)
timer = simplegui.create_timer(100,timer_handler)
# start frame
new_game()
frame.start()
timer.start()