C++ 游戏回放功能 - Game::play(int x) 函数解析

The `play` function in the `Game` class is used to play a recorded game from the history record.\n\nHere is the explanation of the code:\n\n1. First, it checks if the record is empty. If the record is empty, it returns and the function ends.\n2. It retrieves the speed, ghost number, and steps from the history record based on the given parameter `x`.\n3. It initializes the game and sets the `play_flag` to true to indicate that it is in playback mode.\n4. It checks if the ghost number in the record matches the current map. If they don't match, it displays an error message and exits the program.\n5. It sets the direction of the pacman and ghosts based on the recorded steps.\n6. It moves the ghosts and the pacman based on their respective directions.\n7. If the map is in the freeze time state, it decreases the freeze time and changes the color of the pacman.\n8. It checks for collisions between the pacman and ghosts.\n9. It checks for user input and handles different key presses.\n10. It records the directions of the pacman and ghosts.\n11. If the user presses a direction key during playback, it exits the playback mode and enters the normal game mode.\n12. It updates the UI to display the current game state.\n13. It increments the time counter and checks if the playback is finished.\n14. If the playback is finished, it marks the final position of the pacman, displays a message, and waits for any key press before returning to the main menu.\n\nOverall, the `play` function plays a recorded game step by step based on the recorded steps and updates the game state and UI accordingly.