# File lib/gruff/mini/legend.rb, line 72
      def truncate_legend_label(label)
        truncated_label = label.to_s
        while calculate_width(scale_fontsize(@legend_font_size), truncated_label) > (@columns - @legend_left_margin - @right_margin) && (truncated_label.length > 1)
          truncated_label = truncated_label[0..truncated_label.length-2]
        end
        truncated_label + (truncated_label.length < label.to_s.length ? "..." : '')
      end