Hello Elm people!
I'm making a 2D video game to familiarize myself with Elm and I have a
design issue I would like to hear your advice on.
In my game I have different UI entities with different behaviours, for
example:
- Some are collidable with the player / other entities, but other are
not.
- Some move in the game world while other not (the view port might
change, but their game world position does not).
- Some have AI logic that controls how they move, others are dumb.
- Some interact with the mouse cursor while others do not.
I'm not sure how to model the different entities. In OOP scenario I would
use a hierarchy of types and mixin types. In Aspect oriented programming I
would compose them from different aspects. I'm not sure what I should do in
Elm.
I have some constraints, for example, I need to hold all entities (accept,
maybe, background entities without any interaction at all) in one data
structure that will make collision detection easy, like a quadtree. They
all need to be rendered when they are in the view port. I might need to
implement some kind of path-finding algorithm.
I tried using this syntax:
type alias Positioned a =
{ a | x : Float, y : Float }
But I can't make a List or Tree of "Positioned a" and then pattern match on
"a". Or at least, if I can I couldn't figure out a way to make it work.
Any suggestions would be appreciated!
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