12 Days of Visualizations – Sun Burst
Today we are launching our 12 Days of Visualizations program: http://events.pentaho.com/12days-of-Big-Data-Visualizations.html
We are going to release a few new visualizations every week over the holiday period. You can drop these visualizations into a Pentaho BA server and they will appear on the charting menu in Analyzer.
The first one that we are releasing is a Sun Burst chart. This chart is based on the Protovis sun burst chart - http://mbostock.github.com/protovis/ex/sunburst.html
The Sun Burst chart we created can be used in a couple of ways. Firstly it can be used as a multi-level pie chart. This sun burst shows how the sales in three territories breaks down into sales of product lines within those territories, and then how product line sales compare by year:
This effect is achieved by using a color gradient for the outer ring that is based on the chart palette color of the inner rings, and by sorting the segments in each ring into descending order. When you compare the sun burst above with the pie chart below, you can see how much more information the sun burst provides.
You can choose to use a common color gradient on the outer ring so that it is easier to compare the items on that ring. In this example a blue gradient has been used for the outer ring. Regardless of which territory a city is in, the shade of blue it is colored in can be used to compare it with other cities.
In this chart a red/yellow/green gradient has been used. Here the levels of the chart are year, quarter, and month so the data has not been sorted. The data for this chart is overtime costs so the gradient has been reversed to show larger overtime costs in red, and smaller ones in green.
You can find out more about this chart here: http://wiki.pentaho.com/display/COM/Sunburst