Introducing weighted rules (and randomness)

load_library 'context_free'

def setup_the_creature
  @creature = ContextFree.define do
    
    rule :start do
      split do
        11.times do |count|       # 11 times increment rotation by 30 degrees
          legs :rotation => count * 30
          rewind                  # rewind context
        end
        legs :rotation => 360
      end
    end
    
    rule :legs do
      circle :hue => 0.15, :saturation => 0.5, :brightness => 1.0, :color => [0.95, 0.15]
      legs :y => 0.1, :size => 0.965
    end
    
    rule :legs, 0.01 do
      circle
      split do
        legs :rotation => 3 
        rewind
        legs :rotation => -3
      end
    end
    
  end
end

def setup
  size 600, 600
  setup_the_creature
  no_stroke
  color_mode HSB, 1.0
  smooth
  draw_it
  # save_frame("creature.png")
end

def draw
  # Do nothing.
end

def draw_it
  background -1.0
  @creature.render :start, :size => height/5, :stop_size => 0.8,
  :start_x => width/2, :start_y => height/3,  :color => [0.75, 0.1, 0.9]
end

def mouse_clicked
  draw_it
end



Spooky result (makes your processor do a bit of work before it displays)