How to add data labels using axlsx

Question

I'm trying to generate a pie chart using axlsx for ruby. Everything is working fine but I can't seem to get data labels to appear for each "pie slice". What I'm shooting for is more or less like this image. (ie it should have the data labels and leader lines). It would also be fine to have the labels just have the numerical value and include a legend with the color mapping as usual.

Anyone know how to do this?

Thanks

Answer 1

This is randym, the author of axlsx. The short version is that this has not been implemented yet, so you are not going to be able to get labels into the chart as per your image.

The biggest missing piece from the spec is (ECMA-376 - Part 1)

21.2.2.49 dLbls (Data Labels)

Which needs to be plugged into either series, chart, or both as it appears to be a common element of all three.

I will have sometime later this week to have a deeper look, but if you are up for contributing to axlsx - grab me on freenode (#axlsx) or post an issue to the repo https://github.com/randym/axlsx

UPDATE

Turns out this was much easier than I anticipated.

There is now a working version on master (https://github.com/randym/axlsx) for pie charts. I'll update the rest of the supported chart types over the next few days and shoot for an official release next week.

Thanks for letting me know that you needed this.

Here is a simple example of how to use it:

require 'axlsx'
p = Axlsx::Package.new
wb = p.workbook

# Pie Chart
wb.add_worksheet(:name => "Pie Chart") do |sheet|
  sheet.add_row ["First", "Second", "Third", "Fourth"]
  sheet.add_row [1, 2, 3, 4]
  sheet.add_chart(Axlsx::Pie3DChart, :start_at => [0,2], :end_at => [5, 15], :title=> 'dark corner here') do |chart|
    chart.add_series :data => sheet["A2:D2"], :labels => sheet["A1:D1"]
    chart.d_lbls.show_val = true
    chart.d_lbls.show_percent = true
    chart.d_lbls.d_lbl_pos = :outEnd
    chart.d_lbls.show_leader_lines = true
  end
end

p.serialize 'pie_chart_with_data_labels.xlsx'

Available attributes for d_lbls are:

lbl_pos Must be one of :bestFit, :b, :ctr, :inBase, :inEnd, :l, :outEnd, :r, :t By default axlsx will use :bestFit

and the following boolean attributes:

show_legend_key

show_val

show_cat_name

show_ser_name

show_percent

show_bubble_size

show_leader_lines