/**
    Bars - part of a Gate or EitGate, which can be opened/closed.
    These are *visual* only.

    A Gate should call Bars.close() immediately after the Bars are created.
    An ExitGate should create the Bars during begin(), and then call Bars.open() when the gate is open.
*/
class Bars : ActionRole {

    fun open() {
        replaceAction( ScaleTo( actor, 1, Vector2(1, 0.001), Eases.easeIn ).then( Kill(actor) ) )
    }

    fun close() {
        actor.scale.y = 0.001
        replaceAction( ScaleTo( actor, 1, 1, Eases.easeIn ) )
    }
}