Pygame开发问题：简易模式下按下反方向键如何让角色停止移动

• 存在无效语法行：movement_window = pygame.time.get_ticks() + 末尾未赋值，无实际作用还会干扰执行逻辑，直接删除即可。
• 核心逻辑顺序错误：原有逻辑中，判断到按下反方向键将move_dir设为空后，同一个判断分支下紧接着会触发if move_dir != "" and not start_of_game的条件，只要反方向键还处于按下状态，就会立刻将move_dir重新赋值为反方向并执行移动，等于停止操作被直接覆盖，只有按键时长极短、刚好错过该赋值逻辑时才会触发停止效果。

将handle_movement函数中easy模式对应的代码段替换为以下内容：

else:
    # 初始化逻辑简化，删除无用的时间窗口判断
    if move_dir == "" and start_of_game:
        start_of_game = False

    # 向左移动逻辑
    if (pressed[pygame.K_a] or pressed[pygame.K_LEFT]) and player.x - (SPEED + player.width//2) > 0:
        # 当前向右移动时按左直接停止
        if move_dir == "right":
            move_dir = ""
        # 静止或正在向左时，继续向左移动
        elif move_dir == "" or move_dir == "left":
            move_dir = "left"
            player.x -= SPEED
    # 没有按左键但当前方向为左，继续惯性移动
    elif move_dir == "left" and player.x - (SPEED + player.width//2) > 0:
        player.x -= SPEED

    # 向右移动逻辑
    if (pressed[pygame.K_d] or pressed[pygame.K_RIGHT]) and player.x + (SPEED + player.width//2) < MAP_W:
        if move_dir == "left":
            move_dir = ""
        elif move_dir == "" or move_dir == "right":
            move_dir = "right"
            player.x += SPEED
    elif move_dir == "right" and player.x + (SPEED + player.width//2) < MAP_W:
        player.x += SPEED

    # 向上移动逻辑
    if (pressed[pygame.K_w] or pressed[pygame.K_UP]) and player.y - (SPEED + player.width//2) > 0:
        if move_dir == "down":
            move_dir = ""
        elif move_dir == "" or move_dir == "up":
            move_dir = "up"
            player.y -= SPEED
    elif move_dir == "up" and player.y - (SPEED + player.width//2) > 0:
        player.y -= SPEED

    # 向下移动逻辑
    if (pressed[pygame.K_s] or pressed[pygame.K_DOWN]) and player.y + (SPEED + player.height//2) < MAP_H:
        if move_dir == "up":
            move_dir = ""
        elif move_dir == "" or move_dir == "down":
            move_dir = "down"
            player.y += SPEED
    elif move_dir == "down" and player.y + (SPEED + player.height//2) < MAP_H:
        player.y += SPEED

替换后即可实现按下反方向键立刻停止的效果，原有移动惯性、边界检测逻辑也能正常运行。

内容的提问来源于stack exchange，提问作者dan_stan_man