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@sjengle /README.md Secret
Last active Jan 26, 2016

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D3 Arc Diagram

Arc Diagram

This demo shows how to generate an arc diagram using D3. It is still a work in progress.

The dataset is the same one from the Les Misérables demos [1] [2] provided in the D3 Gallery.

TO DO

  • Update to use reusable chart approach.
  • Update to work with directed graphs (some arcs above, some below).
<!-- python -m SimpleHTTPServer 8080 //-->
<!-- TODO: Convert reusable chart approach. //-->
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<title>CS 360 Data Visualization</title>
<!-- JavaScript Libraries //-->
<script src="http://d3js.org/d3.v3.min.js"></script>
<!-- CSS Style //-->
<link href="http://fonts.googleapis.com/css?family=Source+Sans+Pro:300,900|Source+Code+Pro:300" rel="stylesheet" type="text/css">
<link href="style.css" rel="stylesheet" type="text/css">
<script>
/* GLOBALS */
var width = 960; // width of svg image
var height = 400; // height of svg image
var margin = 20; // amount of margin around plot area
var pad = margin / 2; // actual padding amount
var radius = 4; // fixed node radius
var yfixed = pad + radius; // y position for all nodes
/* HELPER FUNCTIONS */
// Generates a tooltip for a SVG circle element based on its ID
function addTooltip(circle) {
var x = parseFloat(circle.attr("cx"));
var y = parseFloat(circle.attr("cy"));
var r = parseFloat(circle.attr("r"));
var text = circle.attr("id");
var tooltip = d3.select("#plot")
.append("text")
.text(text)
.attr("x", x)
.attr("y", y)
.attr("dy", -r * 2)
.attr("id", "tooltip");
var offset = tooltip.node().getBBox().width / 2;
if ((x - offset) < 0) {
tooltip.attr("text-anchor", "start");
tooltip.attr("dx", -r);
}
else if ((x + offset) > (width - margin)) {
tooltip.attr("text-anchor", "end");
tooltip.attr("dx", r);
}
else {
tooltip.attr("text-anchor", "middle");
tooltip.attr("dx", 0);
}
}
/* MAIN DRAW METHOD */
// Draws an arc diagram for the provided undirected graph
function arcDiagram(graph) {
// create svg image
var svg = d3.select("body")
.append("svg")
.attr("id", "arc")
.attr("width", width)
.attr("height", height);
// draw border around svg image
// svg.append("rect")
// .attr("class", "outline")
// .attr("width", width)
// .attr("height", height);
// create plot area within svg image
var plot = svg.append("g")
.attr("id", "plot")
.attr("transform", "translate(" + pad + ", " + pad + ")");
// fix graph links to map to objects instead of indices
graph.links.forEach(function(d, i) {
d.source = isNaN(d.source) ? d.source : graph.nodes[d.source];
d.target = isNaN(d.target) ? d.target : graph.nodes[d.target];
});
// must be done AFTER links are fixed
linearLayout(graph.nodes);
// draw links first, so nodes appear on top
drawLinks(graph.links);
// draw nodes last
drawNodes(graph.nodes);
}
// Layout nodes linearly, sorted by group
function linearLayout(nodes) {
// sort nodes by group
nodes.sort(function(a, b) {
return a.group - b.group;
})
// used to scale node index to x position
var xscale = d3.scale.linear()
.domain([0, nodes.length - 1])
.range([radius, width - margin - radius]);
// calculate pixel location for each node
nodes.forEach(function(d, i) {
d.x = xscale(i);
d.y = yfixed;
});
}
// Draws nodes on plot
function drawNodes(nodes) {
// used to assign nodes color by group
var color = d3.scale.category20();
d3.select("#plot").selectAll(".node")
.data(nodes)
.enter()
.append("circle")
.attr("class", "node")
.attr("id", function(d, i) { return d.name; })
.attr("cx", function(d, i) { return d.x; })
.attr("cy", function(d, i) { return d.y; })
.attr("r", function(d, i) { return radius; })
.style("fill", function(d, i) { return color(d.group); })
.on("mouseover", function(d, i) { addTooltip(d3.select(this)); })
.on("mouseout", function(d, i) { d3.select("#tooltip").remove(); });
}
// Draws nice arcs for each link on plot
function drawLinks(links) {
// scale to generate radians (just for lower-half of circle)
var radians = d3.scale.linear()
.range([Math.PI / 2, 3 * Math.PI / 2]);
// path generator for arcs (uses polar coordinates)
var arc = d3.svg.line.radial()
.interpolate("basis")
.tension(0)
.angle(function(d) { return radians(d); });
// add links
d3.select("#plot").selectAll(".link")
.data(links)
.enter()
.append("path")
.attr("class", "link")
.attr("transform", function(d, i) {
// arc will always be drawn around (0, 0)
// shift so (0, 0) will be between source and target
var xshift = d.source.x + (d.target.x - d.source.x) / 2;
var yshift = yfixed;
return "translate(" + xshift + ", " + yshift + ")";
})
.attr("d", function(d, i) {
// get x distance between source and target
var xdist = Math.abs(d.source.x - d.target.x);
// set arc radius based on x distance
arc.radius(xdist / 2);
// want to generate 1/3 as many points per pixel in x direction
var points = d3.range(0, Math.ceil(xdist / 3));
// set radian scale domain
radians.domain([0, points.length - 1]);
// return path for arc
return arc(points);
});
}
</script>
</head>
<body>
<script>
d3.json("miserables.json", arcDiagram);
</script>
</body>
</html>
{
"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":[
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]
}
body {
font-family: 'Source Sans Pro', sans-serif;
font-weight: 300;
}
b {
font-weight: 900;
}
.outline {
fill: none;
stroke: #888888;
stroke-width: 1px;
}
#tooltip {
font-size: 10pt;
font-weight: 900;
fill: #000000;
stroke: #ffffff;
stroke-width: 0.25px;
}
.node {
stroke: #ffffff;
stroke-weight: 1px;
}
.link {
fill: none;
stroke: #888888;
stroke-weight: 1px;
stroke-opacity: 0.5;
}
.highlight {
stroke: red;
stroke-weight: 4px;
stroke-opacity: 1.0;
}
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