module UpdatePaintModule
  @updatables = []
  @paintables = []

  def addUpdatable updatable
    @updatables.push updatable
  end
  def update
    @updatables.each { |updatable| updatable.update if updatable.respond_to? :update}
  end

  def addPaintable printable
    @paintables.push printable
  end
  def paint
    @paintables.each { |paintable| paintable.paint if paintable.respond_to? :paint}
  end  

  def addElement(element)
    @updatables.push element
    @paintables.push element
  end
end