How to record moves and then play them frame by frame after a button is clicked?

Questions & Answers
1

I’m trying to record the functions that have been called, and play them frame by frame after a button is clicked.

For example, I have four buttons here (the triangles) to control my player’s movements.

alt text

public void MoveRight() {

    float x = playerRb.transform.position.x;
    float y = playerRb.transform.position.y;
    playerRb.transform.position = new Vector3(x + 1, y, playerRb.transform.position.z);
}

public void MoveLeft() {

    float x = playerRb.transform.position.x;
    float y = playerRb.transform.position.y;
    playerRb.transform.position = new Vector3(x - 1, y, playerRb.transform.position.z);
}

public void MoveUp() {

    float x = playerRb.transform.position.x;
    float y = playerRb.transform.position.y;
    playerRb.transform.position = new Vector3(x, y + 1, playerRb.transform.position.z);
}

public void MoveDown() {

    float x = playerRb.transform.position.x;
    float y = playerRb.transform.position.y;
    playerRb.transform.position = new Vector3(x, y - 1, playerRb.transform.position.z);
}

Is there a way to record the order of buttons that I have clicked, and then call those functions after the confirm button is clicked?

2

Simple way is probably just to keep a list of all the past moves that gets added to each time the player moves, then read that list out (here I’m using a list of strings, but no reason it couldn’t be a number or Enum)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MoveScript : MonoBehaviour
{
	public Rigidbody playerRb;
	
	public List<string> moves = new List<string>(){};
	
	
	public void MoveRight() 
	{
		float x = playerRb.transform.position.x;
		float y = playerRb.transform.position.y;
		playerRb.transform.position = new Vector3(x + 1, y, playerRb.transform.position.z);
		moves.Add("R");
	}
	
	public void MoveLeft() 
	{
		float x = playerRb.transform.position.x;
		float y = playerRb.transform.position.y;
		playerRb.transform.position = new Vector3(x - 1, y, playerRb.transform.position.z);
		moves.Add("L");
	}
	public void MoveUp() 
	{
		float x = playerRb.transform.position.x;
		float y = playerRb.transform.position.y;
		playerRb.transform.position = new Vector3(x, y + 1, playerRb.transform.position.z);
		moves.Add("U");
	}
	
	public void MoveDown() 
	{
		float x = playerRb.transform.position.x;
		float y = playerRb.transform.position.y;
		playerRb.transform.position = new Vector3(x, y - 1, playerRb.transform.position.z);
		moves.Add("D");
	}
}

⠀

Then once the player hits Play, just go through each item in the list and play it back, probably using a Coroutine so that you can wait between moves. (Here I’ve also added a boolean that makes sure the moves aren’t added in “Playback mode”). In theory you’d just need the button to run “PlayButton” on press, though that will depend on your implementation.

⠀

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MoveScript : MonoBehaviour
{
	public Rigidbody playerRb;
	
	public List<string> moves = new List<string>(){};
	public bool playbackMode = false;
	
	
	public void MoveRight() 
	{
		float x = playerRb.transform.position.x;
		float y = playerRb.transform.position.y;
		playerRb.transform.position = new Vector3(x + 1, y, playerRb.transform.position.z);
		if(!playbackMode) moves.Add("R");
	}
	
	public void MoveLeft() 
	{
		float x = playerRb.transform.position.x;
		float y = playerRb.transform.position.y;
		playerRb.transform.position = new Vector3(x - 1, y, playerRb.transform.position.z);
		if(!playbackMode) moves.Add("L");
	}
	public void MoveUp() 
	{
		float x = playerRb.transform.position.x;
		float y = playerRb.transform.position.y;
		playerRb.transform.position = new Vector3(x, y + 1, playerRb.transform.position.z);
		if(!playbackMode) moves.Add("U");
	}
	
	public void MoveDown() 
	{
		float x = playerRb.transform.position.x;
		float y = playerRb.transform.position.y;
		playerRb.transform.position = new Vector3(x, y - 1, playerRb.transform.position.z);
		if(!playbackMode) moves.Add("D");
	}
	
	public void PlayButton()
	{
		StartCoroutine(PlayMoves());
	}
	
	IEnumerator PlayMoves()
	{
		playbackMode = true;
		foreach (string moveItem in moves)
		{
			if(moveItem == "L") MoveLeft();
			else if(moveItem == "R") MoveRight();
			else if(moveItem == "U") MoveUp();
			else if(moveItem == "D") MoveDown();
			
			yield return new WaitForSeconds(0.5f);
		}
		playbackMode = false;
	}
	
}