truncate_legend_label (Gruff::Mini::Legend)

    # File lib/gruff/mini/legend.rb, line 67
          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