<div class="widget">
    <div class="header">Progress Status</div>
    <div id="chart" class="chart-container">

    </div>
</div>

body {
    background-color: #1B1F2A;
    width: 100%;
    font-family: 'Roboto', sans-serif;
    height: 100%;
}

.widget {
    margin: 0 auto;
    width:350px;
    margin-top:50px;
    background-color: #222D3A;
    border-radius: 5px;
    box-shadow: 0px 0px 1px 0px #06060d;

}

.header{
    background-color: #29384D;
    height:40px;
    color:#929DAF;
    text-align: center;
    line-height: 40px;
    border-top-left-radius: 7px;
    border-top-right-radius: 7px;
    font-weight: 400;
    font-size: 1.5em;
    text-shadow: 1px 1px #06060d;
}

.chart-container{
    padding:25px;
}

.shadow {
    -webkit-filter: drop-shadow( 0px 3px 3px rgba(0,0,0,.1) );
    filter: drop-shadow( 0px 3px 3px rgba(0,0,0,.1) );
}

var percent = 55;


    var pie=d3.layout.pie()
            .value(function(d){return d})
            .sort(null);

    var w=300,h=320;

    var outerRadius=(w/2)-10;
    var innerRadius=outerRadius-8;


    var color = ['#ec1561','#2a3a46','#202b33'];

    var arc=d3.svg.arc()
            .innerRadius(innerRadius)
            .outerRadius(outerRadius)
            .startAngle(0)
            .endAngle(2*Math.PI);

    //The circle is following this
    var arcDummy=d3.svg.arc()
            .innerRadius((outerRadius-innerRadius)/2+innerRadius)
            .outerRadius((outerRadius-innerRadius)/2+innerRadius)
            .startAngle(0);


    var arcLine=d3.svg.arc()
            .innerRadius(innerRadius)
            .outerRadius(outerRadius)
            .startAngle(0);

    var svg=d3.select("#chart")
            .append("svg")
            .attr({
                width:w,
                height:h,
                class:'shadow'
            }).append('g')
            .attr({
                transform:'translate('+w/2+','+h/2+')'
            });


    //background
    var path=svg.append('path')
            .attr({
                d:arc
            })
            .style({
                fill:color[1]
            });


    var pathForeground=svg.append('path')
            .datum({endAngle:0})
            .attr({
                d:arcLine
            })
            .style({
                fill:color[0]
            });

    //Dummy Arc for Circle
    var pathDummy=svg.append('path')
            .datum({endAngle:0})
            .attr({
                d:arcDummy
            }).style({
                fill:color[0]
            });

    var endCircle=svg.append('circle')
            .attr({
                r:12,
                transform:'translate(0,'+ (-outerRadius+15) +')'
            })
            .style({
                stroke:color[0],
                'stroke-width':8,
                fill:color[2]
            });

    var middleTextCount=svg.append('text')
            .datum(0)
            .text(function(d){
                return d+'%';
            })

            .attr({
                class:'middleText',
                'text-anchor':'middle',
                dy:25,
                dx:0
            })
            .style({
                fill:'#ec1561',
                'font-size':'80px'

            });


    var arcTweenOld=function(transition, percent,oldValue) {
        transition.attrTween("d", function (d) {

            var newAngle=(percent/100)*(2*Math.PI);

            var interpolate = d3.interpolate(d.endAngle, newAngle);

            var interpolateCount = d3.interpolate(oldValue, percent);


            return function (t) {
                d.endAngle = interpolate(t);
                var pathForegroundCircle = arcLine(d);

                middleTextCount.text(Math.floor(interpolateCount(t))+'%');

                var pathDummyCircle = arcDummy(d);
                var coordinate = pathDummyCircle.split("L")[1].split("A")[0];

                endCircle.attr('transform', 'translate(' + coordinate+ ')');

                return pathForegroundCircle;
            };
        });
    };

    var oldValue=0;

    var animate=function(){
        pathForeground.transition()
                .duration(750)
                .ease('cubic')
                .call(arcTweenOld,percent,oldValue);

        oldValue=percent;
        percent=(Math.random() * 60) + 20;
        setTimeout(animate,3000);
    };

    setTimeout(animate,0);