Question

我正在尝试用pygame编写“太空侵略者”游戏，但无法让玩家正确移动。但是，向左移动会很好。

我对Sprite和Player类的代码是：

class Sprite(pygame.sprite.Sprite):
    def __init__(self, x, y, image = None):
        pygame.sprite.Sprite.__init__(self)
        if image is None:
            self.image = pygame.Surface((25, 25))
            self.image.fill((0, 255, 0))
        else:
            self.image = image

        self.rect = self.image.get_rect()
        self.rect.x, self.rect.y = x, y
        self.speed = 0.5

    def moveLeft(self):
        self.rect.x -= self.speed

    def moveRight(self):
        self.rect.x += self.speed

    def draw(self):
        screen.blit(self.image, (self.rect.x, self.rect.y))


class Player(Sprite):
    def __init__(self, startpos):
        try:
            image = pygame.image.load(PLAYER_SPRITE_LOCATION)
        except: image = None
        Sprite.__init__(self, startpos[0], startpos[1], image)
        print("Player class initialized at %a with sprite %s" % (self.rect, self.image))
        self.score = 0

其余的代码是：

RESOLUTION = (224, 256)
PLAYERPOS  = [112, 220]

pygame.init()
screen = pygame.display.set_mode(RESOLUTION)

player = Player(PLAYERPOS)

end = False
fps = 60
clock = pygame.time.Clock()

printString = ""

PRINTFPS, time = pygame.USEREVENT+1, 1000
pygame.time.set_timer(PRINTFPS, time)
curr_fps = 0

invaders = pygame.sprite.Group()
bullets  = pygame.sprite.Group()
fullscreen = False
while not end:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            end = True
        if event.type == PRINTFPS:
            curr_fps = clock.get_fps()

    pressed = pygame.key.get_pressed()

    if pressed[pygame.K_LEFT] or pressed[pygame.K_a]:
        player.moveLeft()
    if pressed[pygame.K_RIGHT] or pressed[pygame.K_d]:
        player.moveRight()
    if pressed[pygame.K_SPACE] or pressed[pygame.K_s] or pressed[pygame.K_UP]:
        player.score += 1
    if pressed[pygame.K_F11]:
        if not fullscreen:
            screen = pygame.display.set_mode((0, 0), pygame.FULLSCREEN)
            fullscreen = True
        else:
            screen = pygame.display.set_mode(RESOLUTION)
            fullscreen = False
    # Print game data
    prevPrintString = printString
    printString = "\rPlayer: (%s, %s)" % (str("%.3f" % player.rect.x).zfill(7),
                                           str("%.3f" % player.rect.y).zfill(7))
    printString += "; Score: %i" % player.score
    printString += "; FPS: %s" % (str("%.2f" % curr_fps).zfill(5))
    if printString != prevPrintString:
        print(printString, end = "")

    # Background (not really needed)
    screen.fill((0, 0, 255)) # Blue screen!

    # Update sprites, e.g. invaders moving and bullets flying
    invaders.update()
    bullets.update()

    # Drawing sprites
    invaders.draw(screen)
    bullets.draw(screen)

    player.draw()

    # Update screen and maintain constant FPS
    clock.tick(fps)
    pygame.display.flip()

问题不是输入不起作用：我可以确定它确实起作用。我认为问题出在moveRight函数本身上，以某种方式它可能无法与加法一起使用？但是我不知道。

谢谢你！

Answer 1

pygame Rect中存储的所有字段都是整数，但是您要添加或减去分数（0.5）。我最好的猜测是，当您从x坐标减去0.5时，它从（例如）112变为111.5，并被截断为111，因此您向左移动了一个像素。但是，如果添加0.5，则它从112变为112.5，并被截断为112，因此您完全不会移动。我建议只使用整数。

无法在pygame上向右移动玩家

1 个答案: