lighttroupe/luz-next

class ProjectEffectDirectorVoyage < ProjectEffect
    title                "Director Voyage"
    description "Moves between selected directors using a percentage progress, showing at most two at a time."

    setting 'tag', :directors
    setting 'progress', :float, :range => 0.0..1.0, :default => 0.0..1.0

    def render
        tag.all { |directors|
            # integer number of directors
            count = directors.size

            # spot between 0.0 and eg. 7.0 for 6 directors
            spot = count * progress

            # the first director
            index = spot.floor

            director_lifetime = spot - index

            # New one comes in behind old one so draw it first
            with_enter_and_exit(director_lifetime, 0.0) {
                directors[index].render!
            } if index < count

            # "Old" one, eg. the first one once we're showing 2 (when index == 1)
            with_enter_and_exit(1.0, director_lifetime) {
                directors[index - 1].render!
            } if index > 0
        }
        yield
    end
end