/**
    An example of a Role which uses an action.
    Actions can be used for many things, including animations.
*/
class MyRole : ActionRole {

    // Grow for 2 seconds, then shrink back in 2 seconds.
    override fun createAction() : Action {
        return (
             Scale( actor, 2, 1.5 ) then
             Scale( actor, 2, 1.0 )
        ).forever()
    }

    override fun begin() {
        // If your Role needs to use the begin() method, then you MUST call super...
        super.begin()
        // Now perform your own initialisation
    }

    override fun tick() {
        // If you Role also need to perform addition actions each frame, then you MUST call super...
        super.tick()
        // Now include your own per-frame code...
    }
}