2D scene graph node. An actor has a position, rectangular size, origin, scale, rotation, Z index, and color. The position corresponds to the unrotated, unscaled bottom left corner of the actor. The position is relative to the actor's parent. The origin is relative to the position and is used for scale and rotation.

An actor has a list of in-progress actions that are applied to the actor (over time). These are generally used to change the presentation of the actor (moving it, resizing it, etc). See act(float) and Action.

An actor has two kinds of listeners associated with it: "capture" and regular. The listeners are notified of events the actor or its children receive. The capture listeners are designed to allow a parent or container actor to hide events from child actors. The regular listeners are designed to allow an actor to respond to events that have been delivered. See fire(com.badlogic.gdx.scenes.scene2d.Event) for more details.

An InputListener can receive all the basic input events, and more complex listeners (like ClickListener and ActorGestureListener) can listen for and combine primitive events and recognize complex interactions like multi-click or pinch.