[Solved]-Creating a ring chart with Highcharts-Highcharts

Simple example using polar chart with some data interpolation: http://jsfiddle.net/ghvKY/

function interpolateData (min, max, step, index) {
    var d = [];

    // add points from start to one before last
    for(var i = min; i < max; i += step){
         d.push([i,index]);   
    }
    //add end point
    d.push([max, index]);

    return d;
}