var dataset = [
        { name: 'IE', percent: 39.10 },
        { name: 'Chrome', percent: 32.51 },
        { name: 'Safari', percent: 13.68 },
        { name: 'Firefox', percent: 8.71 },
        { name: 'Others', percent: 6.01 }
    ];

    var pie=d3.layout.pie()
            .value(function(d){return d.percent;})
            .sort(null)
            .padAngle(.03);

    var w=300,h=300;

    var outerRadius=w/2;
    var innerRadius=100;

    var color = d3.scale.category10();

    var arc=d3.svg.arc()
            .outerRadius(outerRadius)
            .innerRadius(innerRadius);

    var svg=d3.select("#chart")
            .append("svg")
            .attr({
                width:w,
                height:h,
                class:'shadow'
            }).append('g')
            .attr({
                transform:'translate('+w/2+','+h/2+')'
            });
    var path=svg.selectAll('path')
            .data(pie(dataset))
            .enter()
            .append('path')
            .attr({
                d:arc,
                fill:function(d,i){
                    return color(d.data.name);
                }
            });

    path.transition()
            .duration(1000)
            .attrTween('d', function(d) {
                var interpolate = d3.interpolate({startAngle: 0, endAngle: 0}, d);
                return function(t) {
                    return arc(interpolate(t));
                };
            });


    var restOfTheData=function(){
        var text=svg.selectAll('text')
                .data(pie(dataset))
                .enter()
                .append("text")
                .transition()
                .duration(200)
                .attr("transform", function (d) {
                    return "translate(" + arc.centroid(d) + ")";
                })
                .attr("dy", ".4em")
                .attr("text-anchor", "middle")
                .text(function(d){
                    return d.data.percent+"%";
                })
                .style({
                    fill:'#fff',
                    'font-size':'10px'
                });

        var legendRectSize=20;
        var legendSpacing=7;
        var legendHeight=legendRectSize+legendSpacing;


        var legend=svg.selectAll('.legend')
                .data(color.domain())
                .enter()
                .append('g')
                .attr({
                    class:'legend',
                    transform:function(d,i){
                        //Just a calculation for x & y position
                        return 'translate(-35,' + ((i*legendHeight)-65) + ')';
                    }
                });
        legend.append('rect')
                .attr({
                    width:legendRectSize,
                    height:legendRectSize,
                    rx:20,
                    ry:20
                })
                .style({
                    fill:color,
                    stroke:color
                });

        legend.append('text')
                .attr({
                    x:30,
                    y:15
                })
                .text(function(d){
                    return d;
                }).style({
                    fill:'#929DAF',
                    'font-size':'14px'
                });
    };

    setTimeout(restOfTheData,1000);