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POStoring parameter templates to create new entities from?
 

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  1. POStoring parameter templates to create new entities from?
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    <p>My entity system for my game uses templates to lay out how entities are created. Something like:</p> <pre><code>EntityTemplateManager.register("zombie", new PhysicsComponent(10), // speed new SpriteComponent("zombie"), // graphic new HealthComponent(100) // health ); </code></pre> <p>I like this part of the system because it makes sure I don't miss any parameters or screw up their type.</p> <p>Then I can create a new entity like this:</p> <p><code>entity : Entity = EntityTemplateManager.create("zombie");</code></p> <p>Pretty straight forward.</p> <p>What I do now, to actually create the entity, is have the EntityTemplateManager create 1 entity to use as a default, then I call clone() on the entity and it goes through and clone()s all of its components and returns the result.</p> <p>Actual code:</p> <pre><code>public function clone() : Entity { var components : Vector.&lt;Component&gt; = new Vector.&lt;Component&gt;(); var length : int = _components.length; for (var i : int = 0; i &lt; length; ++i) components.push(_components[i].clone()); // copy my local components to the new entity return new Entity(_name, _type, components); } </code></pre> <p>The problem is, every time I create (design) a new component, I have to write (design) a clone() method inside of it AND keep track of all the parameters that were called on the constructor to create a brand new, default stated component.</p> <p>So I end up with junk like this:</p> <pre><code>public class ComponentX { protected var _defaultName : String; protected var _defaultStartingAnimation : String; protected var _defaultBroadcastAnimationEnded : Boolean; protected var _defaultOffsetX : Number; protected var _defaultOffsetY : Number; // other stuff hidden public function ComponentX(name : String, startingAnimation : String, broadcastAnimationEnded : Boolean = false, offsetX : Number = 0, offsetY : Number = 0) : void { super(); _defaultName = name; _defaultStartingAnimation = startingAnimation; _defaultBroadcastAnimationEnded = broadcastAnimationEnded; _defaultOffsetX = offsetX; _defaultOffsetY = offsetY; } public function clone() : Component { return new ComponentX(_defaultName, _defaultStartingAnimation, _defaultBroadcastAnimationEnded, _defaultOffsetX, _defaultOffsetY); } // other methods } </code></pre> <p>I really don't like this -- it's wasteful and error prone.</p> <p>How could I best store the parameters of the EntityTemplateManager.register() function (including the components' constructors parameters) and use that new storage to create entities from instead?</p> <p>I've tried some generic clone() methods like with a ByteArray or describeType(), but they don't work with protected / private variables.</p> <p>Ideas?</p>
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    1. USBruce
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    1. COwhy don't you just call create("zombie") everytime you need one? A lot easier and no cloning needed.
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    2. COWhen I call create("zombie"), that's where it goes through and does the cloning. I store one, un-used entity as a template for all the others to clone themselves from.
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      1. USBruce
 

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