无法在 pygame 中移动角色

Question

我试图在 pygame 中移动我的角色（宇宙飞船），但到目前为止我所做的没有奏效。 一切都运行并显示字符，但当我按下键时它不会移动。

class Player:
    vel = 10
    x = width/2-PLAYER.get_width()/2
    y = 450

    def __init__(self, width, height):
        self.width = width
        self.height = height

    def draw_player(self, win):
        win.blit(PLAYER, (self.x, self.y))


def main():
    running = True
    clock = pygame.time.Clock()
    fps = 30
    while running:
        bg = Background(0, 0)
        bg.draw_background()
        sc = Score(f"Score: {score}", WHITE)
        sc.draw_score()
        player = Player(50, 50)
        player.draw_player(win)
        pygame.display.set_caption("Space Invaders Game")

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False

        keys = pygame.key.get_pressed()
        if keys[pygame.K_RIGHT]:
            player.x += 1
        if keys[pygame.K_LEFT]:
            player.x -= 1

        pygame.display.flip()
        clock.tick(fps)


if __name__ == "__main__":
    main()

Answer 1

当您创建 class 的实例时，将执行构造函数并初始化 object 属性。 因此，您在他的起始 position 中不断创建一个新player 。 您一遍又一遍地在同一个 position 处绘制玩家。 实际上玩家正在移动，但您永远看不到移动，因为在起始 position 会立即创建一个新玩家来替换第一个玩家。
您必须在应用程序循环之前而不是在应用程序循环中创建Player class 的实例 object：

def main():

    player = Player(50, 50)       # <--- ADD

    running = True
    clock = pygame.time.Clock()
    fps = 30
    while running:
        bg = Background(0, 0)
        bg.draw_background()
        sc = Score(f"Score: {score}", WHITE)
        sc.draw_score()

        # player = Player(50, 50)    <--- REMOVE
        
        player.draw_player(win)
        pygame.display.set_caption("Space Invaders Game")

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False

        keys = pygame.key.get_pressed()
        if keys[pygame.K_RIGHT]:
            player.x += 1
        if keys[pygame.K_LEFT]:
            player.x -= 1

        pygame.display.flip()
        clock.tick(fps)