// Fired by Ship
class Bullet : AbstractRole {

    // The speed in pixels per tick
    // Note, the direction is determined by actor.direction.
    var speed = 6.0

    override fun tick() {
        actor.moveForwards( speed )

        val overlapping = DrunkInvaders.instance.overlapping

        for( enemy in actor.stage.findRolesByClass<Alien>( Alien ) ) {
            if (overlapping.overlapping( actor, enemy.actor ) ) {
                enemy.hit()
                actor.die()
                break
            }
        }

        if ( actor.x < 0 || actor.y < 0 || actor.x > 640 || actor.y > 480 ) {
            actor.die()
        }
    }

}