pygame-tutorial / 10-refactoring.py

import pygame

class Sprite(pygame.sprite.Sprite):
    def __init__(self, image, location):
        super(Sprite, self).__init__()
        self.image = pygame.image.load(image)
        self.rect = pygame.rect.Rect(location, self.image.get_size())

class Player(Sprite):
    def update(self, dt):
        key = pygame.key.get_pressed()
        if key[pygame.K_LEFT]:
            self.rect.x -= 300 * dt
        if key[pygame.K_RIGHT]:
            self.rect.x += 300 * dt
        if key[pygame.K_UP]:
            self.rect.y -= 300 * dt
        if key[pygame.K_DOWN]:
            self.rect.y += 300 * dt

class Game(object):
    def main(self, screen):
        clock = pygame.time.Clock()

        sprites = pygame.sprite.OrderedUpdates()
        background = Sprite('background.png', (0, 0))
        sprites.add(background)
        player = Player('player.png', (320, 240))
        sprites.add(player)

        while 1:
            dt = clock.tick(30)

            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    return
                if event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
                    return

            sprites.update(dt / 1000.)
            sprites.draw(screen)
            pygame.display.flip()

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((640, 480))
    Game().main(screen)
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