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Question by migguragi2018 · Oct 29, 2018 at 08:38 AM · c#android2d gamesprites

How do you arrange sprites in order by name in Sprite atlas?

Hi

I want to stack each sprite from sprite atlas orderly so that whenever I want, I can get them by number later.

so sprites are named like this x_y. (eg. 0-1, 0-2, 0-3, 1-0, 1-1...)

x is item type and y is the number of the type.

below code is the process of getting type and number from sprite name

 for(int i = 0; i < sprites.Length; ++i){
                 spriteName = sprites[i].name;
                 splitStandard = spriteName.IndexOf("(");
                 
                 spriteName = spriteName.Remove(splitStandard);
                 
                 typeAndNumberHolder = spriteName.Split('-');
                  
 
                 StoreSprites(typeAndNumberHolder[0], typeAndNumberHolder[1], sprites[i]);
             }



then I store it by type first with switch statement. but I noticed number of type doesn't stack orderly. Because when I pack atlas, it doesn't stack orderly by name in the first place (even if it is sorted well in folder). so stacked sprite arrays like this 3-2, 0-4, 1-2.... should I add some function to tidy up this or is there any way that you can pack sprites by name? I'm a newbie and I'm not sure this approach is right to show up items later in a store when it comes to performance for android game.

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Answer by sarvsammatindia · Feb 23, 2020 at 03:48 AM

@migguragi2018 I assume you have sprites with animation and files are named with some numeric index. eg Sprite_1.png Sprite_2.png Sprite_3.png and while packing in sprite atlas the sequence is not in the correct order and if you try to create animation by sequentially swapping the texture over a sprite the animation is not looking in a correct order.

Here is how I do it

     public SpriteAtlas loadedAtlas;
     public Sprite[] loadedSprites = new Sprite[35];
  loadedAtlast.GetSprites(loadedSprites);
         spriteCount = loadedAtlast.spriteCount;
 
  System.Array.Sort(loadedSprites, (a, b) => {
             if (a == b)
             {
                 return 0;
             }
             // nulls sort after anything else
             else if (a == null)
             {
                 return 1;
             }
             else if (b == null)
             {
                 return -1;
             }
             else return a.name.CompareTo(b.name); 
 });


This code helps me sort the sprite by name in sprite atlas

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