Adds an actor to the root of the stage.
Calls the Actor#act(float) method on each actor in the stage. Typically called
each frame. This meth
Creates a stage with the specified viewport and batch. This can be used to avoid
creating a new batc
The viewport's world height.
Returns the root group which holds all actors in the stage.
The viewport's world width.
The viewport's camera.
Sets the actor that will receive key events.
Returns the root's child actors.