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Simple Arc Diagram Layout
Raw
readme.md

An example of a simple arc diagram layout I wrote for an upcoming workshop on network data visualization.

Raw
d3.layout.arcDiagram.js
(function() {
d3.layout.arcDiagram = function() {
var directed = true,
size = [1,1],
nodes = [],
edges = [],
edgeWeight = function (d) {return 1},
nodeID = function (d) {return d.id};
function arcDiagram() {
var width = size[0],
height = size[1],
nodeStep = width / nodes.length,
nodeHeight = height / nodes.length,
constructedMatrix = [],
matrix = [],
edgeHash = {},
nodeHash = {};
nodes.forEach(function (node, i) {
nodeHash[nodeID(node)] = node;
node.x = i * nodeStep;
node.y = size[1];
})
edges.forEach(function(edge) {
if (typeof edge.source === "number") {
edge.source = nodes[edge.source];
}
if (typeof edge.target === "number") {
edge.target = nodes[edge.target];
}
var id = nodeID(edge.source) + "-" + nodeID(edge.target);
if (!edgeHash[id]) {
edgeHash[id] = edge;
}
else {
edgeHash[id].weight = edgeHash[id].weight + edgeWeight(edge);
}
});
return arcDiagram;
}
arcDiagram.directed = function(x) {
if (!arguments.length) return directed;
directed = x;
return arcDiagram;
}
arcDiagram.size = function(x) {
if (!arguments.length) return size;
size = x;
return arcDiagram;
}
arcDiagram.nodes = function(x) {
if (!arguments.length) return nodes;
nodes = x;
return arcDiagram;
}
arcDiagram.links = function(x) {
if (!arguments.length) return edges;
edges = x;
return arcDiagram;
}
arcDiagram.edgeWeight = function(x) {
if (!arguments.length) return edgeWeight;
if (typeof x === "function") {
edgeWeight = x;
}
else {
edgeWeight = function () {return x};
}
return arcDiagram;
}
arcDiagram.nodeID = function(x) {
if (!arguments.length) return nodeID;
if (typeof x === "function") {
nodeID = x;
}
return arcDiagram;
}
arcDiagram.arc = function (d) {
var draw = d3.svg.line().interpolate("basis");
var midX = (d.source.x + d.target.x) / 2; //
var midPercent = Math.abs(((d.source.x - d.target.x) / size[0]));
var midY = size[1] + (midPercent * size[1]);
if (d.source.x > d.target.x) {
var midY = size[1] - (midPercent * size[1]);
}
return draw([[d.source.x,d.source.y],[midX,midY],[d.target.x,d.target.y]])
}
return arcDiagram;
}
})();
Raw
index.html
<html>
<head>
<title>Arc Diagram Demo</title>
<meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="d3.layout.arcDiagram.js" type="text/JavaScript"></script>
</head>
<style>
svg {
height: 500px;
width: 500px;
border: 1px solid gray;
display: inline-block;
}
g.am-axis text {
font-size: 8px;
}
.domain {
fill: none;
}
.tick > line{
stroke: black;
stroke-width: 1px;
stroke-opacity: .25;
}
</style>
<body>
<div id="viz">
<svg id="arc-diagram">
</svg>
</div>
</body>
<footer>
<script>
var someColors = d3.scale.category20b();
d3.json("miserables.json", createArcDiagram);
function createArcDiagram(data) {
//create some random back links just to demo the functionality
data.links.forEach(function (link) {
if (Math.random() < .1) {
data.links.push({source: link.target, target: link.source, value: 1})
}
});
var arcDiagram = d3.layout.arcDiagram()
.size([450,250])
.nodes(data.nodes)
.links(data.links)
.nodeID(function (d) {return d.name});
//initialize the arc diagram
arcDiagram();
var arcG = d3.select("svg#arc-diagram")
.append("g").attr("id", "arcG")
.attr("transform", "translate(25,0)");
arcG.selectAll("path")
.data(data.links)
.enter()
.append("path")
.attr("class", "arc")
.style("stroke", function (d) {return someColors(d.source.group)})
.style("stroke-width", 2)
.style("opacity", .25)
.style("fill", "none")
.attr("d", arcDiagram.arc);
arcG.selectAll("circle")
.data(data.nodes)
.enter()
.append("circle")
.attr("class", "node")
.attr("r", 2)
.style("fill", function (d) {return someColors(d.group)})
.attr("cx", function (d) {return d.x;})
.attr("cy", function (d) {return d.y});
}
</script>
</footer>
</html>
Raw
miserables.json
{
"nodes":[
{"name":"Myriel","group":1},
{"name":"Napoleon","group":1},
{"name":"Mlle.Baptistine","group":1},
{"name":"Mme.Magloire","group":1},
{"name":"CountessdeLo","group":1},
{"name":"Geborand","group":1},
{"name":"Champtercier","group":1},
{"name":"Cravatte","group":1},
{"name":"Count","group":1},
{"name":"OldMan","group":1},
{"name":"Labarre","group":2},
{"name":"Valjean","group":2},
{"name":"Marguerite","group":3},
{"name":"Mme.deR","group":2},
{"name":"Isabeau","group":2},
{"name":"Gervais","group":2},
{"name":"Tholomyes","group":3},
{"name":"Listolier","group":3},
{"name":"Fameuil","group":3},
{"name":"Blacheville","group":3},
{"name":"Favourite","group":3},
{"name":"Dahlia","group":3},
{"name":"Zephine","group":3},
{"name":"Fantine","group":3},
{"name":"Mme.Thenardier","group":4},
{"name":"Thenardier","group":4},
{"name":"Cosette","group":5},
{"name":"Javert","group":4},
{"name":"Fauchelevent","group":0},
{"name":"Bamatabois","group":2},
{"name":"Perpetue","group":3},
{"name":"Simplice","group":2},
{"name":"Scaufflaire","group":2},
{"name":"Woman1","group":2},
{"name":"Judge","group":2},
{"name":"Champmathieu","group":2},
{"name":"Brevet","group":2},
{"name":"Chenildieu","group":2},
{"name":"Cochepaille","group":2},
{"name":"Pontmercy","group":4},
{"name":"Boulatruelle","group":6},
{"name":"Eponine","group":4},
{"name":"Anzelma","group":4},
{"name":"Woman2","group":5},
{"name":"MotherInnocent","group":0},
{"name":"Gribier","group":0},
{"name":"Jondrette","group":7},
{"name":"Mme.Burgon","group":7},
{"name":"Gavroche","group":8},
{"name":"Gillenormand","group":5},
{"name":"Magnon","group":5},
{"name":"Mlle.Gillenormand","group":5},
{"name":"Mme.Pontmercy","group":5},
{"name":"Mlle.Vaubois","group":5},
{"name":"Lt.Gillenormand","group":5},
{"name":"Marius","group":8},
{"name":"BaronessT","group":5},
{"name":"Mabeuf","group":8},
{"name":"Enjolras","group":8},
{"name":"Combeferre","group":8},
{"name":"Prouvaire","group":8},
{"name":"Feuilly","group":8},
{"name":"Courfeyrac","group":8},
{"name":"Bahorel","group":8},
{"name":"Bossuet","group":8},
{"name":"Joly","group":8},
{"name":"Grantaire","group":8},
{"name":"MotherPlutarch","group":9},
{"name":"Gueulemer","group":4},
{"name":"Babet","group":4},
{"name":"Claquesous","group":4},
{"name":"Montparnasse","group":4},
{"name":"Toussaint","group":5},
{"name":"Child1","group":10},
{"name":"Child2","group":10},
{"name":"Brujon","group":4},
{"name":"Mme.Hucheloup","group":8}
],
"links":[
{"source":1,"target":0,"value":1},
{"source":2,"target":0,"value":8},
{"source":3,"target":0,"value":10},
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]
}
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