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Slick Forums • View topic - Get a list of all entities having a certain component?

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PostPosted: Fri Sep 20, 2013 6:46 am 
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Hi. Is there a way to get a list of all entities containing a certain component? Right now I'm using the GroupManager, but I'm wondering if it would be possible using components.

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PostPosted: Fri Sep 20, 2013 11:28 am 
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You could create an EntitySystem for the Aspect you're interested in. Retrieve the entities by calling EntitySystem#getActives.

Alternatively create your own Manager that intercepts entities with sought component(s).

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PostPosted: Sun Sep 29, 2013 10:50 pm 
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I've stumbled across this problem in my current project as well.
A method in world or entity manager would be nice, as having to write a system for every component just for getting all entities isn't very nice, i'd say.

It would be a quite expensive to gather all entites with said component. You would have to iterate through all entities and check if they intersect with a bit set that only contains that one components index.

I think I'll add this, but it really shouldn't be the way get entities, systems are still the way to go!

Take a look at this fork down here in junkdogs signature (or in mine :D).

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