d3.js concentric ring chart

Question

I am looking to develop an arc ring chart. Where each new set of data is displayed as a concentric ring inside the other.

http://jsfiddle.net/NYEaX/101/

I\'ve tr

Answer 1

Replace

    var endAngle = ((ri+1)*arcPartition); 

by

    var endAngle = startAngle + arcPartition;