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<meta charset="utf-8">
<style>
.link {
stroke: #777;
stroke-opacity: 0.2;
stroke-width: 1.5px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
height = 500
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var force = d3.layout.force()
.gravity(.05)
.charge(-240)
.linkDistance(60)
.size([width, height]);
d3.json("readme.json", function(error, json) {
if (error) throw error;
force
.nodes(json.nodes)
.links(json.links)
.start();
var link = svg.selectAll(".link")
.data(json.links)
.enter().append("line")
.attr("class", "link");
var node = svg.selectAll(".node")
.data(json.nodes)
.enter().append("g")
.attr("class", "node")
.call(force.drag);
node.append("image")
.attr("class", "circle")
.attr("xlink:href", "mbostock.jpg")
.attr("x", "-10px")
.attr("y", "-10px")
.attr("width", "20px")
.attr("height", "20px");
node.append("title")
.text(function(d) { return d.name; });
force.on("tick", function() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
});
});
</script>
https://d3js.org/d3.v3.min.js