itch.io

Hi! We had setup a subreddit for Superpowers help but it's not very convenient so we're in the process of setting up new forums right here on itch.io community, they'll go live pretty soon :) In the meantime, I can answer your question right here.

So just to give some context, actors are made of a few things:

• a name ("Test 1" for instance) and potentially a parent actor
• a transform (position, rotation, scale)
• a list of components

In order to attach some state and/or logic to an actor, you can use a behavior, which is a type of component (there are other types too, like a sprite renderer to name one).

// First we declare a new behavior class.
// It can be used on any number of actors
class MyCustomBehavior extends Sup.Behavior {
  health = 100;

  takeDamage(amount) {
    this.health -= amount;
  }
}
Sup.registerBehavior(MyCustomBehavior);

// Then we create an actor
let actor = new Sup.Actor("Test 1");
// And we attach an instance of our behavior class to it
actor.addBehavior(MyCustomBehavior);

// Later on, if we want to access the health member variable on the behavior, we can write:
Sup.log(actor.getBehavior(MyCustomBehavior).health);

// And we can call methods on the behavior like so:
actor.getBehavior(MyCustomBehavior).takeDamage(5);

As you can see, using "someActor.getBehavior" is useful when your global initialization code needs to call methods or access member variables on a particular behavior. It is also useful if you have one behavior that needs to act on another actor's behavior, for instance, when an enemy hits a player, or vice versa.

We should probably add such an example to the documentation at docs.sparklinlabs.com/en/getting-started/variables...