draw_vertical_legend (Gruff::Mini::Legend)

    # File lib/gruff/mini/legend.rb, line 17
          def draw_vertical_legend

            @legend_labels = @data.collect {|item| item[Gruff::Base::DATA_LABEL_INDEX] }

            legend_square_width = 40.0 # small square with color of this item
            legend_square_margin = 10.0
            @legend_left_margin = 100.0
            legend_top_margin = 40.0

            # May fix legend drawing problem at small sizes
            @d.font = @font if @font
            @d.pointsize = @legend_font_size

            current_x_offset = @legend_left_margin
            current_y_offset = @original_rows + legend_top_margin

            debug { @d.line 0.0, current_y_offset, @raw_columns, current_y_offset }

            @legend_labels.each_with_index do |legend_label, index|

              # Draw label
              @d.fill = @font_color
              @d.font = @font if @font
              @d.pointsize = scale_fontsize(@legend_font_size)
              @d.stroke = 'transparent'
              @d.font_weight = Magick::NormalWeight
              @d.gravity = Magick::WestGravity
              @d = @d.annotate_scaled( @base_image,
                                @raw_columns, 1.0,
                                current_x_offset + (legend_square_width * 1.7), current_y_offset,
                                truncate_legend_label(legend_label), @scale)

              # Now draw box with color of this dataset
              @d = @d.stroke 'transparent'
              @d = @d.fill @data[index][Gruff::Base::DATA_COLOR_INDEX]
              @d = @d.rectangle(current_x_offset,
                                current_y_offset - legend_square_width / 2.0,
                                current_x_offset + legend_square_width,
                                current_y_offset + legend_square_width / 2.0)

              current_y_offset += calculate_caps_height(@legend_font_size) * 1.7
            end
            @color_index = 0
          end