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A multi-level pie chart is a pie (or donut) chart in which each piece of pie is further split into smaller pieces. It is sometimes also called "sunburst partition":

baobab

Is there an open source JavaScript library that would allow me to display a multi-level pie chart?
Data would be sent by the server, for instance as JSON/JSONP.

Requirements:

  • Display multi-level pie chart
  • Open source
  • Data must never be sent to any third-party (so no Google Charts)
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    How about d3? – John Sep 28 '15 at 10:21
  • @John: You mean bl.ocks.org/mbostock/4063423 I guess? It seems to require a bit of programming, but good find! – Nicolas Raoul♦ Sep 28 '15 at 10:34
  • Yes, exactly. I does need quite a bit of programming, but so far d3 is the most versatile library for plotting diagrams of every kind. – John Sep 28 '15 at 11:05
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If you want a highly customized, open-source Javascript chart library, then D3 is a clear choice. It has been making the lives of visual artists and data scientists a lot easier with a diverse range of possibilities, along with ease of use.

Your example chart looks like the Sunburst chart to me. And here is the chart re-created in D3

enter image description here

And your data is definitely safe, as you wouldn't be dealing/interacting with third parties.

Another library worth mentioning is the Highcharts.js; which is another wonderful visualizations open-source Javascript library.

Here is the fiddle for plotting a sunburst chart in Highcharts. And again, your data is completely safe and the library is open-source.

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