lighttroupe/luz

require 'cycle_logic'

class ActorEffectChildCycle < ActorEffect
    include CycleLogic

    title                "Child Cycle"
    description "Causes children to enter and exit, where at most two are visible at a time."

    categories :child_consumer

    setting 'forwards', :event, :summary => '% forward'
    setting 'backwards', :event, :summary => '% backward'
    setting 'crossfade_time', :timespan, :summary => true

    hint "Future effects should respond to enter and exit."

    def tick
        @current_spot = cycle_update(@current_spot, (forwards.count - backwards.count), crossfade_time)
    end

    def render
        low_index = @current_spot.floor % total_children
        high_index = (low_index + 1) % total_children
        progress = (@current_spot - @current_spot.floor)
        if (child_index == low_index) && (progress != 1.0)
            with_enter_and_exit(1.0, progress) {
                yield
            }
        end

        if (child_index == high_index) && (progress != 0.0)
            with_enter_and_exit(progress, 0.0) {
                yield
            }
        end
    end
end