lighttroupe/luz

module CycleLogic
    def cycle_update(current_spot, desired_spot, time)
        return desired_spot if time.instant?

        current_spot ||= 0.0

        if current_spot != desired_spot
            travel_distance = time.delta        # percent we've traveled through crossfade time is also how far to travel between actors (distance 1.0)

            if current_spot < desired_spot
                current_spot += travel_distance
                current_spot = desired_spot if current_spot > desired_spot
            else
                current_spot -= travel_distance
                current_spot = desired_spot if current_spot < desired_spot
            end
        end

        current_spot
    end

    def crossfade_render(first, second, progress)
        with_enter_and_exit(1.0, progress) { first.render! } if (first and (progress != 1.0))
        with_enter_and_exit(progress, 0.0) { second.render! } if (second and (progress != 0.0))
    end
end