lighttroupe/luz-next

class ActorEffectSlice < ActorEffect
    title                "Slice"
    description "Creates a chosen number of 'slices' of actor, each controllable separately as children."

    categories :transform, :child_producer

    setting 'number', :integer, :range => 1..100, :default => 1..2
    setting 'angle', :float, :default => 0.0..1.0
    setting 'distribution', :curve

    def render
        return yield if number == 1

        width = ((2 * RADIUS) / number)
        one_over_number = (1.0 / number)        # dividing the curve X space

        with_roll(angle) {
            number.distribute_exclusive(-RADIUS..RADIUS) { |x, index|
                # sample the distribution curve at two points
                x1 = distribution.value(x + RADIUS) - RADIUS
                x2 = distribution.value(x + RADIUS + one_over_number) - RADIUS

                # swap them if they're out of order (curve sloping down)
                x1, x2 = x2, x1 if x1 > x2

                with_vertical_clip_plane_left_of(x1) {
                    with_vertical_clip_plane_right_of(x2) {
                        with_roll(-angle) {
                            yield :child_index => index, :total_children => number
                        }
                    }
                }
            }
        }
    end
end