Pygame：如何在不按任何键的情况下使精灵面对相同的方向

Question

我的角色能够正确移动。然而，当没有按键被按下时，出现问题。如何在没有按下KEY的情况下使精灵指向与上次面对的方向相同的方向？例如，如果我按下UP，它会面朝上，然后当我不按任何其他键时，它仍然会面朝上吗？同样与其他方向。另外，首次启动游戏时我会如何显示角色？就像，我的角色仅在按下键时才会显示，而在没有按键时仍然不可见。

这是我的代码：

Sprites：

# Protagonist Sprites
protagR = [pygame.image.load("ASG2_Graphics/JoArrow_R1_1.png"), pygame.image.load("ASG2_Graphics/JoArrow_R1_2.png"), pygame.image.load("ASG2_Graphics/JoArrow_R1_3.png"), pygame.image.load("ASG2_Graphics/JoArrow_R1_2.png"), pygame.image.load("ASG2_Graphics/JoArrow_R1_1.png")]
protagL = [pygame.image.load("ASG2_Graphics/JoArrow_L1_1.png"), pygame.image.load("ASG2_Graphics/JoArrow_L1_2.png"), pygame.image.load("ASG2_Graphics/JoArrow_L1_3.png"), pygame.image.load("ASG2_Graphics/JoArrow_L1_2.png"), pygame.image.load("ASG2_Graphics/JoArrow_L1_1.png")]
protagU = [pygame.image.load("ASG2_Graphics/JoArrow_U1_1.png"), pygame.image.load("ASG2_Graphics/JoArrow_U1_2.png"), pygame.image.load("ASG2_Graphics/JoArrow_U1_3.png"), pygame.image.load("ASG2_Graphics/JoArrow_U1_2.png"), pygame.image.load("ASG2_Graphics/JoArrow_U1_1.png")]
protagD = [pygame.image.load("ASG2_Graphics/JoArrow_D1_1.png"), pygame.image.load("ASG2_Graphics/JoArrow_D1_2.png"), pygame.image.load("ASG2_Graphics/JoArrow_D1_3.png"), pygame.image.load("ASG2_Graphics/JoArrow_D1_2.png"), pygame.image.load("ASG2_Graphics/JoArrow_D1_1.png")]
# Bullet Sprites
bulletsP = [pygame.image.load("ASG2_Graphics/Bullet_1.png"), pygame.image.load("ASG2_Graphics/Bullet_2.png"), pygame.image.load("ASG2_Graphics/Bullet_3.png"), pygame.image.load("ASG2_Graphics/Bullet_4.png")]
bulletsE = [pygame.image.load("ASG2_Graphics/E_Bullet_1.png"), pygame.image.load("ASG2_Graphics/E_Bullet_2.png"), pygame.image.load("ASG2_Graphics/E_Bullet_3.png")]
# Enemy Sprites
enemyR = [pygame.image.load("ASG2_Graphics/Enemy_R1_1.png"), pygame.image.load("ASG2_Graphics/Enemy_R1_2.png"), pygame.image.load("ASG2_Graphics/Enemy_R1_3.png"), pygame.image.load("ASG2_Graphics/Enemy_R1_4.png"), pygame.image.load("ASG2_Graphics/Enemy_R1_5.png")]
enemyL = [pygame.image.load("ASG2_Graphics/Enemy_L1_1.png"), pygame.image.load("ASG2_Graphics/Enemy_L1_2.png"), pygame.image.load("ASG2_Graphics/Enemy_L1_3.png"), pygame.image.load("ASG2_Graphics/Enemy_L1_4.png"), pygame.image.load("ASG2_Graphics/Enemy_L1_5.png")]
enemyU = [pygame.image.load("ASG2_Graphics/Enemy_U1_1.png"), pygame.image.load("ASG2_Graphics/Enemy_U1_2.png"), pygame.image.load("ASG2_Graphics/Enemy_U1_3.png"), pygame.image.load("ASG2_Graphics/Enemy_U1_4.png"), pygame.image.load("ASG2_Graphics/Enemy_U1_5.png")]
enemyD = [pygame.image.load("ASG2_Graphics/Enemy_D1_1.png"), pygame.image.load("ASG2_Graphics/Enemy_D1_2.png"), pygame.image.load("ASG2_Graphics/Enemy_D1_3.png"), pygame.image.load("ASG2_Graphics/Enemy_D1_4.png"), pygame.image.load("ASG2_Graphics/Enemy_D1_5.png")]
# Background Sprite
bg = pygame.image.load("Star_Crusaders_MAP.png")
main（）

def main():
    board = player(30, 45, 64, 64, 0)
    while True:
        movePlayer(board) 
类播放器（）：

class player():
    def __init__(self, x, y, width, height, walkCount):
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.vel = 5
        self.up = False
        self.down = False
        self.left = False
        self.right = False
        self.up = False
        self.down = False
        self.walkCount = walkCount
movePlayer（）

    def movePlayer(board):
        clock = pygame.time.Clock()
        run = True

        while run:
            clock.tick(15)

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

            arrowKeys = pygame.key.get_pressed()
            if arrowKeys[pygame.K_LEFT] and board.x > 25 + board.vel:
                board.x -= board.vel
                board.left = True
                board.right = False
                board.up = False
                board.down = False
            elif arrowKeys[pygame.K_RIGHT] and board.x < 485 - board.width - board.vel:
                board.x += board.vel
                board.right = True
                board.left = False
                board.up = False
                board.down = False
            elif arrowKeys[pygame.K_UP] and board.y > 40 + board.vel:
                board.y -= board.vel
                board.right = False
                board.left = False
                board.up = True
                board.down = False
            elif arrowKeys[pygame.K_DOWN] and board.y < 450 - board.height - board.vel:
                board.y += board.vel
                board.right = False
                board.left = False
                board.up = False
                board.down = True
            elif arrowKeys[pygame.K_ESCAPE]:  # ESC key
                stopGame()
            else:
                board.right = False
                board.left = False
                board.up = False
                board.down = False
                board.walkCount = 0

            redrawGameWindow(board)
redrawGameWindow（）

def redrawGameWindow(board):
    window.blit(bg, (0,0))
    dest = (board.x, board.y)

    if board.walkCount + 1 >= 30:
        board.walkCount = 0
    if board.left:
        window.blit(protagL[0], dest)
        # currentSprite = protagL[0]
    elif board.right:
        window.blit(protagR[0], dest)
        # currentSprite = protagR[0]
    elif board.up:
        window.blit(protagU[0], dest)
        # currentSprite = protagU[0]
    elif board.down:
        window.blit(protagD[0], dest)
        # currentSprite = protagD[0]
    # stillSprite(currentSprite, board)
    pygame.display.update()
如您所见，我尝试使用currentSprite（）变量和stillSprite（）函数来尝试存储最后按下的键，但无济于事。谢谢您的帮助。

我的角色能够正确移动。然而，当没有按键被按下时，出现问题。我如何做到这一点，当没有按键被按下时，精灵将面对与上次相同的方向...