2D Aarray for Tile based Game

Unity Engine
1

Hello everyone,
I’m working on a 2D tile based game with pokemon-like movement and so I need to prevent my character to pass trought walls. I’ve tried to do it with collision.

    Vector3 lastpos;
    float speed = 2.0f;                         // Speed of movement
    Vector3 localscale;
    GameObject perso;

    void Start()
    {
        pos = transform.position;          // Take the initial position
        perso = GameObject.Find("Perso_sprite");
        anim = perso.GetComponent<Animator>();
    }

    void FixedUpdate()
    {
        if (Input.GetKey(KeyCode.Q) && transform.position == pos)
        {        // Left
            lastpos = pos;
            pos += Vector3.left;
            anim.SetBool ("Up", false);
            anim.SetBool ("Down", false);
            anim.SetBool ("Right", false);
            anim.SetBool ("Left", true);
            anim.SetBool ("Pause", false);
               
        }
        if (Input.GetKey(KeyCode.D) && transform.position == pos)
        {        // Right
            lastpos = pos;
            pos += Vector3.right;
            anim.SetBool ("Up", false);
            anim.SetBool ("Down", false);
            anim.SetBool ("Right", true);
            anim.SetBool ("Left", false);
            anim.SetBool ("Pause", false);
        }
        if (Input.GetKey(KeyCode.Z) && transform.position == pos)
        {        // Up
            lastpos = pos;
            pos += Vector3.up;
            anim.SetBool ("Up", true);
            anim.SetBool ("Down", false);
            anim.SetBool ("Right", false);
            anim.SetBool ("Left", false);
            anim.SetBool ("Pause", false);
        }
        if (Input.GetKey (KeyCode.S) && transform.position == pos) {        // Down
            lastpos = pos;
            pos += Vector3.down;
            anim.SetBool ("Up", false);
            anim.SetBool ("Down", true);
            anim.SetBool ("Right", false);
            anim.SetBool ("Left", false);
            anim.SetBool ("Pause", false);
        }
            transform.position = Vector3.MoveTowards (transform.position, pos, Time.deltaTime * speed);// Move there
        if(pos == transform.position ){
            anim.SetBool ("Pause", true);
        }
    }
     void OnTrggerEnter2D(Collider2D coll){
        if (coll.gameObject.tag == "Wall")
        {
            transform.position = lastpos;
            pos = lastpos;
            Debug.Log ("Collision");
        }
    }
}

But my character went back to the lastpos before reaching the tile next to the wall.

I heard that I need to make an Array and to set up tile but I don’t know how to do it. I need to set the Array in a new script but how do I can get Array informations in my movement script?

If you can help me it will be really useful for continue my project indeed I’m looking on the web for 2 weeks and I don’t have answers. If I can’t do it I think I will give up my project.

Tanks

PS: Sorry for misspellings I’m French

2

You can fire a raycast with maximum distance and see if it hits a wall…depending on this you would decide whether to move or not.