d3 behavior.drag example

<!DOCTYPE html>
<html>
 <head>
   <title>Chernoff Smileys</title>
   <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.5.1/d3.js"></script>
   <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.5.1/d3.layout.js"></script>
   <style type="text/css">

</style>
 </head>
 <body>

<p>Click a Smiley<p>

var drag = d3.behavior.drag()
        .on("drag", function(d,i) {
            d.x += d3.event.dx
            d.y += d3.event.dy
            d3.select(this).attr("transform", function(d,i){
                return "translate(" + [ d.x,d.y ] + ")"
            })
        });

function face_factory(classname, data, x, y, r)
    { 
        //data format
        //{ "x": 0 - 1 , "y": 0 -1, "z": 0-1 }
        //color could be made a parameter
        //var arc = d3.svg.arc().outerRadius(r)
        //var donut = d3.layout.pie();

var face = d3.select("#charts")
            .append("svg:g")
                //.data([data.sort(d3.descending)])
                //.data([data])
                .data([ {"x":x, "y":y} ])
                .attr("class", classname)
                .attr("transform", "translate(" + x + "," + y + ")")
                .call(drag);

console.log("make head");
        var head_color = d3.scale.linear()
            .domain([0, 1])
            .interpolate(d3.interpolateRgb)
            .range(["#ff0000", "#0000ff"]);

var head = face.append("svg:circle")
                .attr("class", "head")
                .attr("fill", function(d){ return head_color(data.x); })
                .attr("fill-opacity", .8)
                .attr("stroke", "#000")
                .attr("stroke-width", 4)
                .attr("r", r);

console.log("make mouth");
        var mouth_x = [0, .5, 1];

var mouth_x_range = d3.scale.linear()
            .domain([0, 1])
            .range([-r/2, r/2]);

var mouth_y_range = d3.scale.linear()
            .domain([0, 1])
            .range([-r/2, r/2]);

var mouth_y = [.5, data.y, .5];
        console.log(mouth_y)

var mouth_line = d3.svg.line()
            .x(function(d,i) {
                return mouth_x_range(mouth_x[i]);
            })
            .y(function(d,i) {
                return mouth_y_range(mouth_y[i]);
            })
            .interpolate("basis");

/*
        var mouth = face.append("svg:path")
                .attr("class", "mouth")
                .attr("stroke", "#000")
                .attr("stroke-width", 4)
                .attr("fill", "none")
                .attr("transform", "translate(" + [0, r/3] + ")")
                .attr("d", mouth_line(mouth_x));
                */

console.log("create eyes")
        var eyer = r/10 + data.z * (r/3);
        console.log(eyer);
        var left_eye = face.append("svg:circle")
            .attr("class", "eyes")
            .attr("stroke", "#000")
            .attr("fill", "none")
            .attr("stroke-width", 4)
            .attr("transform", "translate(" + [-r/2.5, -r/3] + ")")
            .attr("r", eyer);

//eyer = r/10 + data.w * (r/3);
        var right_eye = face.append("svg:circle")
            .attr("class", "eyes")
            .attr("stroke", "#000")
            .attr("fill", "none")
            .attr("stroke-width", 4)
            .attr("transform", "translate(" + [r/2.5, -r/3] + ")")
            .attr("r", eyer);

var text = face.append("svg:text")
            .text("SMILE!")
            .attr("y", ".5em")
            .attr("transform", "translate(" + [0, r/3] + ")")
            .attr("text-anchor", "middle")
            .attr("font-weight", 700)
            .attr("font-family", "Helvetica")
            .attr("fill", "#ff0")
            .attr("stroke", "none")
            .attr("pointer-events", "none")

}

var w = 700;
    var h = 400;

//setup svg canvas
    d3.select("body")
        .append("svg:svg")
            .attr("width", w)
            .attr("height", h)
            .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")

//r = 100;
    for(i = 0; i < 20; i++)
    {
        var r = 20 + Math.random() * 50;
        var data = { "x":Math.random(), "y":Math.random(), "z":Math.random(), "w":Math.random() };
        x = Math.random() * w
        y = Math.random() * h
        face_factory("face"+i, data, x, y, r);
    }
    
   
   </script>
 </body>
</html>

Modified http://mbostock.github.com/d3/d3.js?2.5.0 to a secure url

Modified http://mbostock.github.com/d3/d3.layout.js?2.5.0 to a secure url

https://mbostock.github.com/d3/d3.js?2.5.0

https://mbostock.github.com/d3/d3.layout.js?2.5.0