Simple sorting selection example

<!DOCTYPE html>
<html>
 <head>
   <title>Pie Chart</title>
   <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.3.0/d3.js"></script>
   <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.3.0/d3.layout.js"></script>
   <style type="text/css">

body {
 font: 10px sans-serif;
}

</style>
 </head>
 <body>

<p style="font-size:12pt;">Click in the box to bake a pie!<p>

var num = 7;
    var gradient = d3.scale.linear()
        .domain([ 0, num])
        .interpolate(d3.interpolateRgb)
        .range(["#00ffaa", "#ff00aa"])

function bakepie(classname, data, x, y, r)
    { 
        //color could be made a parameter
        var color = d3.scale.category10()
        var arc = d3.svg.arc()
            .innerRadius(r*.6)
            .outerRadius(r)
        var donut = d3.layout.pie()
            .sort(d3.descending);

var pie = d3.select("#charts")
            .append("svg:g")
                //.data([data.sort(d3.descending)])
                .data([data])
                .attr("class", classname);

var arcs = pie.selectAll("g.arc")
           .data(donut)
         .enter().append("svg:g")
           .attr("class", "arc")
           .attr("transform", "translate(" + x + "," + y + ")");

var paths = arcs.append("svg:path")
            .attr("fill", function(d, i) { return color(i); })
            .attr("fill-opacity", .6)
            .attr("d", arc);

//Make sure we select our arcs int he right order
        var selected = d3.selectAll("." + classname + " g.arc path")
            .sort(function(a,b)
            {
                //console.log(a)
                //console.log(b)
                return d3.descending(a.value, b.value);
            })
        selected.attr("fill", function(d, i) { return gradient(i);})
        
    }

//setup svg canvas
    d3.select("body")
        .append("svg:svg")
            .attr("width", 900)
            .attr("height", 450)
            .attr("id", "charts")
            .on("click", clickypie)
            .append("svg:rect")
                .attr("width", "100%")
                .attr("height", "100%")
                .attr("stroke", "#000")
                .attr("stroke-width", 3)
                .attr("fill", "none")

count = 0
    function clickypie()
    {  
        count += 1;
        //center the py at the position of the mouse click
        var xy = d3.svg.mouse(this);
        //radius is random between 50 and 150
        var r = 50 + Math.random() * 100;
        //array of random values with num elements
        var data = d3.range(num)
            .map(Math.random)

bakepie("pie"+count, data, xy[0], xy[1], r);
    };

</script>
 </body>
</html>

Modified http://mbostock.github.com/d3/d3.js?2.3.0 to a secure url

Modified http://mbostock.github.com/d3/d3.layout.js?2.3.0 to a secure url

https://mbostock.github.com/d3/d3.js?2.3.0

https://mbostock.github.com/d3/d3.layout.js?2.3.0