lighttroupe/luz

class ActorEffectSpotlight < ActorEffect
    title                'Spotlight'
    description 'A spotlight is a combination of the brightening draw mode, alpha control, a stack, and scaling.'

    categories :child_producer

    setting 'number', :integer, :range => 1..1000, :default => 1..2
    setting 'roll', :float, :range => -1000.0..1000.0, :default => 0.0..1.0
    setting 'smallest', :float, :range => 0.0..1000.0, :default => 1.0..1.0
    setting 'height', :float, :range => 0.0..1000.0, :default => 0.5..1.0
    setting 'alpha', :float, :range => 0.0..1.0, :default => 0.5..1.0

    def render
        with_multiplied_alpha(alpha) {
            with_pixel_combine_function(:brighten) {
                for i in 0...number
                    i.distributed_among(number, 1.0..smallest) { |scale_amount|
                        with_scale(scale_amount) {
                            i.distributed_among(number, 0.0..roll) { |roll_amount|
                                with_roll(roll_amount) {
                                    with_translation(0,0,(i.to_f/number) * height) {
                                        yield :child_index => i, :total_children => number
                                    }
                                }
                            }
                        }
                    }
                end
            }
        }
    end
end