How do I select a group full of sprites, between two points?

Hello. I have come up with a solution for your question. Just follow the steps provided and you will successfully be able to get a list of sprites within two points which you select!

Step 1. Add a tag called "Tile" to each of your tiles.

Step 2. Create a C# script called "TileData" and add that to each of your tiles as well. Place the following code into that script:

 using UnityEngine;
 using UnityEngine.EventSystems;
 
 public class TileData : MonoBehaviour, IPointerClickHandler {
 
     // This is an EventSystem function which will detect a click on UI.
     // This only works for the UI element it's attached to. This is why
     // you add it to each of your tiles.
     public void OnPointerClick(PointerEventData eventData)
     {
         // Accessing the TileManager script. We will make this in the next step.
         TileManager tm = GameObject.Find("GameMaster").GetComponent<TileManager>();
         // Accessing the 'AddSprite' function of the 'TileManager' to add the selected object.
         tm.AddTile(eventData.pointerPress.gameObject);
     }
 }

 

Step 3. Create an empty gameobject in the hierarchy. Name it "GameMaster".

Step 4. Create a C# script called "TileManager" and attach it to the "GameMaster" object. Place the following code into that script.

 using System.Collections.Generic;
 using UnityEngine;
 
 public class TileManager : MonoBehaviour {
     // A list of the two selected tiles
     public List<GameObject> selected;
     // A list of all the tiles
     public List<GameObject> allTiles;
     // A list of the tiles in-between the two selection points
     public List<GameObject> betweenTiles;
 
     private void Start()
     {
         // Creates an array of every tile and adds it to the 'allTiles' array.
         GameObject[] tile = GameObject.FindGameObjectsWithTag("Tile");
 
         for (int i = 0; i < tile.Length; i++)
         {
             allTiles.Add(tile[i]);
         }
     }
 
     // This function that adds the tiles within the selection
     // points to the 'betweenTiles' list.
     public void AddTile(GameObject tile)
     {
         selected.Add(tile);
 
         // When the selected points is = 2
         if (selected.Count == 2)
         {
             // Calculate the minimum coordinate
             Vector2 minCoord = new Vector2(Mathf.Min(selected[0].transform.localPosition.x, selected[1].transform.localPosition.x), Mathf.Min(selected[0].transform.localPosition.y, selected[1].transform.localPosition.y));
             // Calculate the maximum coordinate
             Vector2 maxCoord = new Vector2(Mathf.Max(selected[0].transform.localPosition.x, selected[1].transform.localPosition.x), Mathf.Max(selected[0].transform.localPosition.y, selected[1].transform.localPosition.y));
 
             // Loop through each tile in 'allTiles' and see if the tile is = or
             // within the minCoord and maxCoord.
             for (int i = 0; i < allTiles.Count; i++)
             {
                 if (allTiles[i].transform.localPosition.x >= minCoord.x && allTiles[i].transform.localPosition.x <= maxCoord.x && allTiles[i].transform.localPosition.y >= minCoord.y && allTiles[i].transform.localPosition.y <= maxCoord.y)
                 {
                     // Adds to the 'betweenTiles' list
                     betweenTiles.Add(allTiles[i]);
                 }
             }
         }
     }
 }

Completed. Once this step is finished, you should be able to run the game, select two points, and everything within that square area will be added to a list where you can do what you want with each tile. I'm sorry I can't fully explain what the code does, but there is quite a lot of comments to assist understanding. If you need any other help, be sure to let me know. Thanks,

TBART82!