Hive Plot with mouseover

Attempt at understanding Hive Plot and creating a D3 visual. Mouseover at each node shows the name and type of the node.

"Hive plots define a linear layout for nodes, grouping nodes by type and arranging them along radial axes based on some property of data. The explicit position encoding has the potential to better reveal the network structure while communicating additional information." - Mike Bostock's blog on Hive Plots.

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>Hive Link Plot</title>
	<style type="text/css">
	.link{
		fill: none;
		stroke-width: 1.5px;
	}

.axis, .node{
		stroke: #000;
		stroke-width: 1.5px;
	}

.tooltip{
		position: absolute;
		width: 50px;
		height: 30px;
		padding: 2px;
		font: 12px sans-serif;
		background: lightgreen;
		border: 0px;
		pointer-events: none;
	}

/*.link:hover{
		stroke: red;
		stroke-opacity:.9;
	}*/
	</style>
</head>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script type="text/javascript" src="d3.hive.min.js"></script>
<script type="text/javascript">

var width = 960;
var height = 500;
var outerRadius = 240;
var innerRadius = 40;

var angle = d3.scale.ordinal()
		.domain(d3.range(4))
		.rangePoints([0,2 * Math.PI]);

var radius = d3.scale.linear()
		.range([innerRadius, outerRadius]);

var color = d3.scale.category10()
		.domain(d3.range(20));

var nodes = [
  {x: 0, y: .1, name:"A"},
  {x: 0, y: .9, name:"B"},
  {x: 1, y: .2, name:"C"},
  {x: 1, y: .3, name: "D"},
  {x: 2, y: .1, name: "E"},
  {x: 2, y: .8, name: "F"},
  {x: 1, y: .4, name: "G"},
  {x: 2, y:.2, name: "H"},
  {x: 2, y: .7, name: "I"},
  {x: 2, y: .4, name: "J"},
  {x: 1, y: .6, name: "K"}
];

var links = [
  {source: nodes[0], target: nodes[2]},
  {source: nodes[1], target: nodes[3]},
  {source: nodes[2], target: nodes[4]},
  {source: nodes[2], target: nodes[5]},
  {source: nodes[3], target: nodes[5]},
  {source: nodes[4], target: nodes[0]},
  {source: nodes[5], target: nodes[1]},
  {source: nodes[1], target: nodes[4]},
  {source: nodes[1], target: nodes[6]},
  {source: nodes[6], target: nodes[3]},
  {source: nodes[4], target: nodes[7]},
  {source: nodes[4], target: nodes[7]},
  {source: nodes[7], target: nodes[5]},
  {source: nodes[7], target: nodes[2]},
  {source: nodes[9], target: nodes[2]},
  {source: nodes[8], target: nodes[6]},
  {source: nodes[3], target: nodes[9]},
  {source: nodes[1], target: nodes[8]},
  {source: nodes[4], target: nodes[10]},
  {source: nodes[10], target: nodes[3]},
  {source: nodes[4], target: nodes[10]},
  {source: nodes[8], target: nodes[7]},
  {source: nodes[4], target: nodes[9]},
  {source: nodes[1], target: nodes[7]},
  {source: nodes[10], target: nodes[7]},
];

var svg = d3.select("body").append("svg")
		.attr("width", width)
		.attr("height", height)
	.append("g")
		.attr("transform", "translate(" + width/2 + "," + height/2 + ")");

var tooltip = d3.select("body").append("div")
					.attr("class", "tooltip")
					.style("opacity", 0);

svg.selectAll(".axis")
		.data(d3.range(3))
	.enter().append("line")
		.attr("class", "axis")
		.attr("transform", function(d){ return "rotate(" + degrees(angle(d)) + ")";})
		.attr("x1", radius.range()[0])
		.attr("x2", radius.range()[1]);

svg.selectAll(".link")
    .data(links)
  .enter().append("path")
    .attr("class", "link")
    .attr("d", d3.hive.link()
    .angle(function(d) { return angle(d.x); })
    .radius(function(d) { return radius(d.y); }))
    .style("stroke", function(d) { return color(d.source.x); });

svg.selectAll(".node")
    .data(nodes)
  .enter().append("circle")
    .attr("class", "node")
    .attr("transform", function(d) { return "rotate(" + degrees(angle(d.x)) + ")"; })
    .attr("cx", function(d) { return radius(d.y); })
    .attr("r", 5)
    .style("fill", function(d) { return color(d.x); })
    .on("mouseover", function(d){
    	tooltip.transition()
    		.duration(200)
    		.style("opacity", .9);
    	tooltip.html("Node - " + d.name + "<br/>" + "Type - " + d.x)
    		.style("left", (d3.event.pageX + 5) + "px")
    		.style("top", (d3.event.pageY - 28) + "px");
    })
    .on("mouseout", function(d){
    	tooltip.transition()
    		.duration(500)
    		.style("opacity", 0);
    });

function degrees(radians) {
  return radians / Math.PI * 180 - 90;
}

</script>

</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js