Load a SpriteAtlas, or access SpriteAtlas of a Sprite

Question

I have a SpriteManager that has several lists of sprites. I am using it to change sprite textures during runtime.

I have a folder with all the sprite atlases in it. Because all the "tree" sprites have the same parts, they use the same layout in their atlases. So [oak] has an [oak SpriteAtlas] with a [Limb] sprite, and [pine] has an [pine SpriteAtlas] with a [Limb] sprite.

When I load the sprites, I get [Limb] and [Limb] but do not know how to tell which atlas they came from.

So I want a way to load the sprite atlas as a whole, then load the sprites from that atlas. I do not want to have to specify the name of each tree, as there are too many.

Here is the code currently:

     public IEnumerator LoadSprites()
     {
         Debug.Log("Loading sprites");
 
         //first, we can find all the sprites
         allSpriteObjects = Resources.LoadAll("Sprites", typeof(Sprite));
 
         //then we need a list for each atlas
         allSpriteAtlases = new List<Sprite[]>();

        //now we need to put each sprite in the correct atlas entry
         foreach (Object o in allSpriteObjects)
         {
             Debug.Log("Loaded " + o.name);

             //HERE: How do I know what atlas this sprite was pulled from?

             yield return new WaitForSeconds(0.1f);
         }
 }

My end goal is to have a List<List<Sprite>, or a List<Sprite[]> or a List<SpriteAtlas>, so that I can find the [Limb Sprite] of [pine SpriteAtlas] from the manager.

Answer 1

Hi,

I putted toghether a fast solution, tell me if it works for you. You also need the following namespaces:

-System.Collections;

-UnityEngine;

-UnityEngine.U2D;

 public class SpriteLoader : MonoBehaviour
 {
     Hashtable spriteTable;
 
     public void Start()
     {
         spriteTable = GetSprites();
 
         //use this to loop through the elements
         foreach (DictionaryEntry element in spriteTable)
         {
             Sprite[] sprites = (Sprite[])element.Value;
             foreach (var sprite in sprites)
                 Debug.Log("Sprite in '" + element.Key + "': " + sprite.name);
         }
     }
 
     public Hashtable GetSprites()
     {
         //Insthed of list of list, i used an Hashtable, with key as sprite atlas name
         //and value as array of the sprites of the curren sprite atlas
         Hashtable table = new Hashtable();
 
         //Loading sprite atlases
         SpriteAtlas[] allSpriteAtlases = Resources.LoadAll<SpriteAtlas>("Sprites");
 
         foreach (var element in allSpriteAtlases)
         {
             Sprite[] sprites = new Sprite[element.spriteCount];
             //Clone the sprites of the curren sprite atlas
             //in the 'sprites' array
             element.GetSprites(sprites);
 
             /* this is the structure of the hashtable:
              * key->string(atlas name) value->Sprite[](array of the sprite in the current atlas)
              * 
              * 
              * To access values:
              * table["atlas name"] --> will return the array of sprites of the atlas selected
              * so, for instance if the atlas is "hosue"
              * Sprite[] houseSprites = table["house"];
             */
             table.Add(element.name, sprites);
         }
 
         return table;
     }
 }

Load a SpriteAtlas, or access SpriteAtlas of a Sprite

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