class BouncyRock : Rock {

    var radius : double

    override fun begin() {
        super.begin()
        radius = actor.appearance.width() * 0.45
    }

    override fun tick() {
        super.tick()

        for( otherA in actor.stage.actors ) {
            if ( otherA.role !is BouncyRock) continue
            val other = otherA.role as BouncyRock
            if (other != this && other != null && clan == other.clan ) {
                if ( CircularCollision.overlapping( radius + other.radius, actor.position, other.actor.position ) ) {
                    val hit = CircularCollision.collision(actor.position, velocity, 1, other.actor.position, other.velocity, 1)
                    if ( hit > 0 ) {
                        actor.event("bounce")
                        rotation += hit
                        other.rotation -= hit
                    }
                }
            }
        }        

    }

}