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no need for "IRender" since everything has a java.awt.polygon. i just
draw it. in a sense, the polygon is my IRender and it's data is the
implementation.
i was thinking about using a simple type (:asteroid, :ship, :bullet)
for each entity and pick an "advance"-function (input = complete old
game state + one specific entity, output = new entity) depending on it.
- ->
{:asteroid advance-asteroid :ship advance-ship}
i'd like to avoid mutable states as much as possible which means there
will be one atom or agent for the whole world and a bufferedimage.
other than that, i'd like to stay purely functional.
Am 31.10.2011 19:03, schrieb Timothy Baldridge:
>> In the OOP languages, entity systems seem to be all the rage. I
>> suggest stealing ideas from there if you can.
>
>
> In this same vein, I'd recommend thinking about the following
> approach:
>
> First, read up on reify and protocols. Next, create protocols for
> the main areas of your engine. Perhaps start with IRender and
> IPhysicalEntity
>
> (defprotocol IRender (render [this]))
>
> (defprotocol IPhysicalEntity (update-position [this timespan]))
>
>
>
> then for the user ship, you can do something as simple as:
>
> (defn new-ship [x y] (let [pos (atom {:x x :y y})] (reify IRender
> (render [this] (render-ship-model pos)) IPhysicalEntity
> (update-position [this timespan] (swap! pos #(hash-map :x (inc (:x
> %)) :y (:y %)))))))
>
> there's bound to be errors in the above code, but you get the
> point. The thing I love about the above example is that we've
> completely abstracted away the parts of this engine. We can have
> entities that implement different protocols, we can have a separate
> data structure for each and every entity, depending on its needs,
> and everything is abstracted nicely. Static objects can just
> implement IRender, and invisible objects can implement
> IPhysicalEntity. Extend this to implement ICollideable (for
> collision detection), and you have the makings of a very extensible
> system.
>
> Timothy
>
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