/**
 * Turns the lights on/off (makes the walls invisible)
 * I never liked this "feature", because it only encouraged mapping the world by hand,
 * which is just a PITA. Not fun, and doesn't add any value (from my point of view).
 * Therefore, I only DIM the lights, the walls are still visible. Feel free to change the
 * code in your version if you like the original (change 0.1 to 0.0 below).z
 */
class XORSwitch : Collectable {

    static var on = true

    override fun collected( movement : Movement ) {
        actor.die()
    }

    override fun end() {
        super.end()
        on = !on

        for ( wall in PlayDirector.instance.mainStage.findRolesByClass<Wall>( Wall ) ) {
            wall.actor.color.alpha = if ( on ) 1.0 else 0.1
        }
    }
}