# File lib/chart-candy/builder/line.rb, line 66
  def add_y_axis(nature, original_data, options={})
    options.reverse_merge! key: 'value', max: nil, min: nil

    data = original_data.map{ |d| d[options[:key]] }

    min = options[:min] ? options[:min] : data.min
    max = options[:max] ? options[:max] : data.max

    @chart[:axis][:y] = { nature: nature, label: t('axis.y.label'), min: min, max: max, max_ticks: data.length }
  end