tenis.py

#!/usr/bin/env python
import pygame, sys
#from lib_tenis import *

class Slider(object):
    def __init__(self, screen, x):
        self.screen = screen
        self.x      = x
        self.y      = 0
        self.rect   = pygame.Rect(self.x,self.y, 30,150)

        self.draw()

    def draw(self):
        pygame.draw.rect(self.screen,
                         (255,255,255),
                         self.rect)
        
    def move(self, dy):
        if self.y + dy >= 0 and self.y + dy <= 330:
            self.rect = self.rect.move(0,dy)
            self.y += dy
        self.draw()

pygame.init()

screen = pygame.display.set_mode((640, 480))

# two players and their differences
player1 = Slider(screen, 0)
pl1_dy  = 0
player2 = Slider(screen, 610)
pl2_dy  = 0

clock = pygame.time.Clock()

# position and velocity for x,y
x, y   = 100, 100
dx, dy = 1,1
rect   = pygame.Rect(int(x), int(y), 25, 25)
# main game loop
while True:
    screen.fill((0,0,0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        # operating sliders
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_s:
                pl1_dy = 1
            if event.key == pygame.K_w:
                pl1_dy = -1
            if event.key == pygame.K_DOWN:
                pl2_dy = 1
            if event.key == pygame.K_UP:
                pl2_dy = -1
        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_s:
                pl1_dy = 0
            if event.key == pygame.K_w:
                pl1_dy = 0
            if event.key == pygame.K_DOWN:
                pl2_dy = 0
            if event.key == pygame.K_UP:
                pl2_dy = 0

    # move players
    player1.move(pl1_dy)
    player2.move(pl2_dy)
    # bounce red rect
    if rect.y <= 0 or rect.y + 25 >= 480:
        dy *= -1
    if rect.x <= 0 or rect.x + 25 >= 640:
        dx *= -1
    # adjust the red rect
    rect = rect.move(dx,dy)
    # check for collision
    if rect.colliderect(player1.rect):
        if rect.x >= player1.rect.x:
            dx *= -1
        else:
            dy *= -1
    if rect.colliderect(player2.rect):
        if rect.x <= player2.rect.x:
            dx *= -1
        else:
            dy *= -1
    # draw red rect
    pygame.draw.rect(screen,
                     (255,0,0),
                     rect)

    clock.tick(500)
    pygame.display.update()