I think you're reaching for mutability a little too soon. You could aim to
be more functional, then leave the mutation up to atoms or megarefs.
For example:
(def empty-system
{:entities {}, :components {}})
(let [i (java.lang.concurrent.atomic.AtomicInteger. 1)
(defn new-id [] (.getAndIncrement i)))
(defn add-entity [system ent-id]
(assoc system :entities ent-id {})))
(defn remove-entity [system ent-id]
(dissoc system :entities ent-id))
(defn component-name [component]
(-> component meta ::name))
(defn set-component [system ent-id component]
(let [comp-name (component-name component)]
(-> system
(assoc-in [:entities ent-id comp-name] component)
(assoc-in [:components comp-name ent-id] component))))
(defn remove-component [system ent-id comp-name]
(-> system
(update-in [:entities ent-id] dissoc comp-name)
(update-in [:components comp-name] dissoc ent-id)))
This would give you a way of adding and removing entities and components,
and an way of looking up components by entity, and a way of looking up all
entities that adhere to a particular component.
- James
On 8 June 2014 13:33, Atamert Ölçgen <mu...@muhuk.com> wrote:
> clecs is an entity-component-system written in clojure.
>
> It is not production ready but it is complete in the sense you can use it
> for your hobby projects.
>
> It is available in clojars.
>
> The repo is here: https://github.com/muhuk/clecs
>
> I have written a rant about it[1] but I won't crosspost it here entirely,
> just this bit:
>
> ...if you can take a look and at least tell me about your first
>> impressions it would be great. I have two main questions:
>>
>>
>> - Do you think having a game development library that is completely
>> agnostic about rendering, sound & inputs, i.e. doesn't provide any of
>> these, make sense?
>>
>>
>> - Do you think the API looks right? Is it idiomatic Clojure from a
>> library user's perspective?
>>
>>
>
> [1]:
> http://blog.muhuk.com/2014/06/08/entity_component_system_in_clojure.html
>
>
> --
> Kind Regards,
> Atamert Ölçgen
>
> -+-
> --+
> +++
>
> www.muhuk.com
>
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