PyGame

#!/usr/bin/python2

import pygame
import sys

from player import Player


class Game(object):
    '''
    A basic game
    '''

    FPS = 30
    '''
    The frame per second cap for the game
    '''

    def __init__(self, screen):
        '''
        Start the game
        '''
        # Initialize objects
        clock = pygame.time.Clock()
        player = Player()
        # Main game loop
        while True:
            # Cap at FPS
            dt = clock.tick(Game.FPS)
            # Check for events
            for event in pygame.event.get():
                # If the window is closed, end the game
                if event.type == pygame.QUIT:
                    sys.exit(0)
                # Check for keyboard input
                if event.type == pygame.KEYDOWN:
                    # Pass the key down event to the player
                    if player.keydown(event):
                        break
                    # Key not handled; Ignore it
                elif event.type == pygame.KEYUP:
                    # Pass the key up event to the player
                    if player.keyup(event):
                        break
                    # Key not handled; Ignore it
            # Clear the buffer
            screen.fill((200, 200, 200))
            # Update the player state
            player.update(dt / 1000.0)
            # Paint the player
            player.draw(screen)
            # Flip the buffer and screen
            pygame.display.flip()

if __name__ == "__main__":
    pygame.init()
    pygame.display.set_caption("Example")
    screen = pygame.display.set_mode((640, 480))
    Game(screen)


#!/usr/bin/python2

import pygame


class Player(pygame.sprite.Sprite):
    '''
    A player instance
    '''

    def __init__(self):
        '''
        Initialize the player
        '''
        # Initialize Parent
        pygame.sprite.Sprite.__init__(self)
        # Create a singleton group for the player and add the player to it
        self.__group = pygame.sprite.GroupSingle()
        self.__group.add(self)
        # Set the image and bounds
        self.image = pygame.image.load("resources/rsffavicon.png")
        self.rect = pygame.rect.Rect((320, 240), self.image.get_size())
        # Initialize key states
        self.left = False
        self.right = False
        self.up = False
        self.down = False

    def draw(self, surface):
        '''
        Draw the player on the specified surface
        '''
        self.__group.draw(surface)

    def keydown(self, event):
        '''
        Handles a key down event.
        Returns: Whether the key has been handled
        '''
        # Initialize a default return value
        result = False
        # Check to see if we can handle the key
        if event.key in (pygame.K_a, pygame.K_LEFT):
            self.left = True
            result = True
        elif event.key in (pygame.K_d, pygame.K_RIGHT):
            self.right = True
            result = True
        elif event.key in (pygame.K_w, pygame.K_UP):
            self.up = True
            result = True
        elif event.key in (pygame.K_s, pygame.K_DOWN):
            self.down = True
            result = True
        # Return whether the key has been processed
        return result

    def keyup(self, event):
        '''
        Handles a key up event.
        Returns: Whether the key has been handled
        '''
        # Initialize a default return value
        result = False
        # Check to see if we can handle the key
        if event.key in (pygame.K_a, pygame.K_LEFT):
            self.left = False
            result = True
        elif event.key in (pygame.K_d, pygame.K_RIGHT):
            self.right = False
            result = True
        elif event.key in (pygame.K_w, pygame.K_UP):
            self.up = False
            result = True
        elif event.key in (pygame.K_s, pygame.K_DOWN):
            self.down = False
            result = True
        # Return whether the key has been processed
        return result

    def update(self, dt):
        '''
        Update the player's state
        '''
        if self.left:
            self.rect.x -= 300 * dt
        if self.right:
            self.rect.x += 300 * dt
        if self.up:
            self.rect.y -= 300 * dt
        if self.down:
            self.rect.y += 300 * dt