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# pong: hit the ball with the paddle
#
# use the escape key to exit
#
# on the XO, the escape key is the top lefthand key,
# circle with an x in it.
import pippy
import pygame
import sys
from pygame.locals import *
from random import *
# always need to init first thing
pygame.init()
# create the window and keep track of the surface
# for drawing into
screen = pygame.display.set_mode()
# ask for screen's width and height
size = width, height = screen.get_size()
# turn off the cursor
pygame.mouse.set_visible(False)
# turn on key repeating (repeat 40 times per second)
pygame.key.set_repeat(25, 25)
# start the screen all black
bgcolor = (0, 0, 0)
screen.fill(bgcolor)
# paddle constants
paddle_width = 20
paddle_length = 100
paddle_radius = paddle_length / 2
paddle_color = (250, 250, 250)
step = 6 # paddle moves 3 pixels at a go
# ball constants
ball_color = (250, 250, 250)
ball_radius = 25
# game constants
fsize = 48
msg = 'Press \'g\' to start game'
font = pygame.font.Font(None, fsize)
text = font.render(msg, True, (250, 250, 250))
textRect = text.get_rect()
textRect.centerx = screen.get_rect().centerx
textRect.centery = screen.get_rect().centery
while pippy.pygame.next_frame():
# display msg
screen.fill(bgcolor)
screen.blit(text, textRect)
pygame.display.flip()
# chill until a key is pressed
for idle_event in pygame.event.get():
if idle_event.type == QUIT:
sys.exit()
if idle_event.type == KEYDOWN:
if idle_event.key == K_ESCAPE:
sys.exit()
if idle_event.key == 103: # g key
# play a game!
# start the paddle in the center
paddle_location = height / 2
# number of balls to a game
balls = 4
while balls > 0:
ball_position = [ball_radius, ball_radius]
ball_mvect = [randint(3, 5), randint(3, 5)]
ball_limit = size
balls = balls - 1
while ball_position[0] + ball_radius < ball_limit[0]: # in play
for event in pygame.event.get():
if event.type == QUIT:
sys.exit()
elif event.type == KEYDOWN:
if event.key == K_ESCAPE:
sys.exit()
elif event.key == 273 \
or event.key == 265 \
or event.key == 264: # up
paddle_location = paddle_location - step
elif event.key == 274 \
or event.key == 259 \
or event.key == 258: # down
paddle_location = paddle_location + step
# make sure the paddle is in-bounds
if paddle_location - paddle_radius < 0:
paddle_location = paddle_radius
elif paddle_location + paddle_radius >= height:
paddle_location = height - 1 - paddle_radius
# clear the screen
screen.fill(bgcolor)
# draw the paddle on the right side of the screen
pygame.draw.line(screen,
paddle_color,
(width - paddle_width, paddle_location -
paddle_radius),
(width - paddle_width,
paddle_location + paddle_radius),
paddle_width)
# draw the ball
pygame.draw.circle(screen, ball_color, ball_position, ball_radius)
# draw the unused balls
for i in range(balls):
pygame.draw.circle(screen, ball_color,
(int(round(30 + i * ball_radius * 2.4)), 30),
ball_radius)
# update the display
pygame.display.flip()
# update the ball
for i in range(2):
ball_position[i] = ball_position[i] + ball_mvect[i]
# bounce on top and left
if ball_position[i] < ball_radius:
ball_position[i] = ball_radius
ball_mvect[i] = -1 * ball_mvect[i]
# bounce on bottom
elif i == 1 \
and ball_position[i] >= ball_limit[i] - ball_radius:
ball_position[i] = ball_limit[i] - ball_radius - 1
ball_mvect[i] = -1 * ball_mvect[i]
elif i == 0 \
and ball_position[i] >= ball_limit[i] - ball_radius - paddle_width \
and ball_position[1] > paddle_location - paddle_radius \
and ball_position[1] < paddle_location + paddle_radius:
ball_position[i] = ball_limit[i] - ball_radius - paddle_width - 1
ball_mvect[i] = (-1) * ball_mvect[i]
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