Select a list of tiles through script

Hello!
I am currently making a game in which tiles are destroyable. I am rather new to Unity, and don't really know how to achieve this, maybe you could help me!

I am looking for a way to select all tiles inside a defined rectangular area through script, so I could remove them (set them to null) if there is one.
I already have the setup to create and remove tiles, but I can't find the way to select multiple tiles within chosen boundaries.

Any way I could do that? I hope I'm clear in my request.
Thanks!

 

Hi,

You should be able to do it with the detection of mouseclick.

When the mouse button is pressed, get the position of the object under it, and when it is released, do the same.

Then, destroy any object with positions beetween these two vectors.

 

Thanks for the reply, but I'd like to do it through script, as it will be always the same known area. Do you know how I could get a list of positions ?

 

I don't know if i get it.

If the area is always the same, you can use a Box Collider 2D for that area and make it trigger, change the tag of any tile to the new tag "Tile" and then attach a script like this to your area :

Code (CSharp):

1.  
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Area : MonoBehaviour
6. {
7.     private readonly List<GameObject> tilesColliding = new List<GameObject>();
8.  
9.     public void OnTriggerEnter2D(Collider2D col)
10.     {
11.         //Check if it's a tile and not already in the list
12.         if (col.gameObject.CompareTag("tile") && !this.tilesColliding.Contains(col.gameObject))
13.             this.tilesColliding.Add(col.gameObject);
14.     }
15.     public void OnTriggerExit2D(Collider2D col)
16.     {
17.         //Check if it's a tile ands still in the list
18.         if (col.gameObject.CompareTag("tile") && this.tilesColliding.Contains(col.gameObject))
19.             this.tilesColliding.Remove(col.gameObject);
20.     }
21.  
22.     //And when you want to get positions of colliding tiles, you do this :
23.     public List<Vector3> GetTilesPositions()
24.     {
25.         GameObject[] tiles = GameObject.FindGameObjectsWithTag("Tile");
26.         List<Vector3> positions = new List<Vector3>();
27.  
28.         foreach (GameObject tile in tiles)
29.         {
30.             if (this.tilesColliding.Contains(tile))
31.             {
32.                 positions.Add(tile.transform.position);
33.             }
34.         }
35.  
36.         return positions;
37.     }
38. }
39.  

Don't forget to add a RigidBody2D to your area and colliders to your tiles.
For tiles, make colliders small, and at the center of the tile if you don't want a tile to be considered as selected when its edge is colliding with the area.

 

Hi @Buck595

"looking for a way to select all tiles inside a defined rectangular area through script"
"so I could remove them (set them to null) if there is one."

Simply use 2 nested for loops, nothing else needed.

You could use bounds class to define min and max corners of this area, and then use bounds min and max values in your for loop.

Then iterate y-axis, inside this loop, iterate x-axis and set tiles to null.

Edit - and there's also this:
https://docs.unity3d.com/ScriptReference/Tilemaps.Tilemap.SetTilesBlock.html