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pong.py
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pong.py
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#Rice University Introduction to Interactive Programming (python)
#Implementation of classic arcade game Pong
#Produced in codeskulptor and works better in codeskultptor
#Imported simplieguitk to implement GUI components used in codeskulptor
import simpleguitk as simplegui
import random
# initialize globals - pos and vel encode vertical info for paddles
WIDTH = 700
HEIGHT = 400
BALL_RADIUS = 20
PAD_WIDTH = 8
PAD_HEIGHT = 80
HALF_PAD_WIDTH = PAD_WIDTH / 2
HALF_PAD_HEIGHT = PAD_HEIGHT / 2
LEFT, RIGHT = False, True
ball_vel = [0, 0]
paddle1_pos = HEIGHT/2
paddle2_pos = HEIGHT/2
paddle1_vel = 0
paddle2_vel = 0
score1 = 0
score2 = 0
upkey, downkey = False, False
# 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]
ball_vel[1] = - random.randrange(60, 180)/ 60.0
if direction == RIGHT:
ball_vel[0] = random.randrange(120, 240)/ 60.0
else:
ball_vel[0] = - random.randrange(120, 240)/ 60.0
# define event handlers
def new_game():
global paddle1_pos, paddle2_pos, paddle1_vel, paddle2_vel # these are numbers
global score1, score2 # these are ints
spawn_ball(random.choice([True, False]))
score1 = 0
score2 = 0
paddle1_pos = HEIGHT/2
paddle2_pos = HEIGHT/2
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 and determine whether paddle and ball collide
ball_pos[0] += ball_vel[0]
ball_pos[1] += ball_vel[1]
if ball_pos[0] >= (WIDTH-1)-BALL_RADIUS - PAD_WIDTH: #right
if abs(paddle2_pos - ball_pos[1]) > HALF_PAD_HEIGHT + BALL_RADIUS/2:
spawn_ball(LEFT)
score1 += 1
else:
ball_vel[0] = - ball_vel[0] * 1.1
ball_vel[1] = ball_vel[1] * 1.1
elif ball_pos[0] <= BALL_RADIUS + PAD_WIDTH: #left
if abs(paddle1_pos - ball_pos[1])> HALF_PAD_HEIGHT + BALL_RADIUS/2:
spawn_ball(RIGHT)
score2 += 1
return score2
else:
ball_vel[0] = - ball_vel[0] * 1.1
ball_vel[1] = ball_vel[1] * 1.1
if ball_pos[1] <= BALL_RADIUS: #up
ball_vel[1] = - ball_vel[1]
if ball_pos[1] >= (HEIGHT-1)-BALL_RADIUS: #down
ball_vel[1] = - ball_vel[1]
# draw ball
canvas.draw_circle(ball_pos, BALL_RADIUS, 2, "Red", "White")
# update paddle's vertical position, keep paddle on the screen
paddle1_pos += paddle1_vel
paddle2_pos += paddle2_vel
if paddle1_pos < HALF_PAD_HEIGHT:
paddle1_pos = HALF_PAD_HEIGHT
elif paddle1_pos > HEIGHT - HALF_PAD_HEIGHT:
paddle1_pos = HEIGHT - HALF_PAD_HEIGHT
if paddle2_pos < HALF_PAD_HEIGHT:
paddle2_pos = HALF_PAD_HEIGHT
elif paddle2_pos > HEIGHT - HALF_PAD_HEIGHT:
paddle2_pos = HEIGHT - HALF_PAD_HEIGHT
# draw paddles
canvas.draw_line([HALF_PAD_WIDTH, paddle1_pos + HALF_PAD_HEIGHT],
[HALF_PAD_WIDTH, paddle1_pos - HALF_PAD_HEIGHT], PAD_WIDTH ,'White')
canvas.draw_line([(WIDTH - HALF_PAD_WIDTH), paddle2_pos + HALF_PAD_HEIGHT],
[(WIDTH - HALF_PAD_WIDTH), paddle2_pos - HALF_PAD_HEIGHT], PAD_WIDTH, 'White')
# draw scores
canvas.draw_text(str(score1), [WIDTH*1/4, 80], 50, "Lime")
canvas.draw_text(str(score2), [WIDTH*3/4, 80], 50, "Magenta")
def keydown(key):
global paddle1_vel, paddle2_vel, downkey, upkey
if key==simplegui.KEY_MAP["s"]:
downkey = True
paddle1_vel = 2
elif key==simplegui.KEY_MAP["w"]:
upkey = True
paddle1_vel = -2
if key==simplegui.KEY_MAP["down"]:
downkey = True
paddle2_vel = 2
elif key==simplegui.KEY_MAP["up"]:
upkey = True
paddle2_vel = -2
def keyup(key):
global paddle1_vel, paddle2_vel, downkey, upkey
if key==simplegui.KEY_MAP["s"]:
downkey = False
paddle1_vel = 0 if not upkey else -2
elif key ==simplegui.KEY_MAP["w"]:
upkey = False
paddle1_vel = 0 if not downkey else 2
if key==simplegui.KEY_MAP["down"]:
downkey = False
paddle2_vel = 0 if not upkey else -2
elif key ==simplegui.KEY_MAP["up"]:
upkey = False
paddle2_vel = 0 if not downkey else 2
def reset():
new_game()
# 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("Restart", reset)
# start frame
new_game()
frame.start()
reset()