draw_label (Gruff::Base)

    # File lib/gruff/base.rb, line 837
        def draw_label(x_offset, index)
          return if @hide_line_markers

          if !@labels[index].nil? && @labels_seen[index].nil?
            y_offset = @graph_bottom + LABEL_MARGIN

            @d.fill = @font_color
            @d.font = @font if @font
            @d.stroke('transparent')
            @d.font_weight = NormalWeight
            @d.pointsize = scale_fontsize(@marker_font_size)
            @d.gravity = NorthGravity
            @d = @d.annotate_scaled(@base_image,
            1.0, 1.0,
            x_offset, y_offset,
            @labels[index], @scale)
            @labels_seen[index] = 1
            debug { @d.line 0.0, y_offset, @raw_columns, y_offset }
          end
        end