無法在 pygame 中移動角色

Question

我試圖在 pygame 中移動我的角色（宇宙飛船），但到目前為止我所做的沒有奏效。 一切都運行並顯示字符，但當我按下鍵時它不會移動。

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

當您創建 class 的實例時，將執行構造函數並初始化 object 屬性。 因此，您在他的起始 position 中不斷創建一個新player 。 您一遍又一遍地在同一個 position 處繪制玩家。 實際上玩家正在移動，但您永遠看不到移動，因為在起始 position 會立即創建一個新玩家來替換第一個玩家。
您必須在應用程序循環之前而不是在應用程序循環中創建Player class 的實例 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)