Scripted behaviors

Reusable behaviors can be defined so that you can put them on multiple actors.
This is how a behavior definition might look like:

class MyBehavior extends Sup.Behavior {
  // Declare properties here

  awake() {
    // Put initialization logic here
    // thisactor represents the actor the behavior is attached to
  }

  update() {
    // Put logic that should be executed 60x per second here
  }

}
// Don't forget to register your behavior class
Sup.registerBehavior(MyBehavior);

Inside the behavior's methods (awake, update and others you might define yourself), you can reference the current behavior component with this and the actor it is attached to with this.actor.

Let's add a behavior to our main character from the previous chapter.

class CharacterBehavior extends Sup.Behavior {

  update() {
    if (Sup.Input.isKeyDown("LEFT")) {
      // Move the current behavior's actor by a small negative offset on the X axis
      this.actor.move(-0.1, 0, 0);
    }

    if (Sup.Input.isKeyDown("RIGHT")) {
      // Same but positive to go to the right
      this.actor.move(0.1, 0, 0);
    }
  }

}
Sup.registerBehavior(CharacterBehavior);

// Once the behavior class is defined,
// we need to attach it to our character
mainCharacterActor.addBehavior(CharacterBehavior);

Sup.Input.isKeyDown(...) returns true only when the specified key is pressed.