Question: Can I store entity id in a component?

[linonetwo]

I'm storing tilemap data using the Tile component, and treat them as a list to render them, this works fine.

But if I want to run A* routing algorithm on the tilemap, I have to treat them as 2D array again, but the entity list is a 1D array now...

So I'd like to put a number field in the component to store 4 entity ids, which is in the NSWE of this entity.
So in the map system, I can use this information to reconstruct the 2D tilemap array.

Is this approach OK?

[3mcd]

Yes, that's perfectly fine. That sounds like an interesting problem to solve! I'd love to see the code when you get a chance.