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Ch. 6, Fig. 8 - D3.js in Action
Raw
readme.md

This is the code for Chapter 6, Figure 8 from D3.js in Action showing how to create a force-directed network using d3.layout.force() as well as SVG markers for arrowheads.

Raw
edgelist.csv
source target weight
sam pris 1
roy pris 5
roy sam 1
tully pris 5
tully kim 3
tully pat 1
tully mo 3
kim pat 2
kim mo 1
mo tully 7
mo pat 1
mo pris 1
pat tully 1
pat kim 2
pat mo 5
lee al 3
Raw
index.html
<html>
<head>
<title>D3 in Action Chapter 6 - Example 3</title>
<meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="https://d3js.org/queue.v1.min.js" type="text/JavaScript"></script>
</head>
<style>
svg {
height: 500px;
width: 500px;
border: 1px solid gray;
}
</style>
<body>
<div id="viz">
<svg>
</svg>
</div>
</body>
<footer>
<script>
var marker = d3.select("svg").append('defs')
.append('marker')
.attr("id", "Triangle")
.attr("refX", 12)
.attr("refY", 6)
.attr("markerUnits", 'userSpaceOnUse')
.attr("markerWidth", 12)
.attr("markerHeight", 18)
.attr("orient", 'auto')
.append('path')
.attr("d", 'M 0 0 12 6 0 12 3 6');
queue()
.defer(d3.csv, "nodelist.csv")
.defer(d3.csv, "edgelist.csv")
.await(function(error, file1, file2) { createForceLayout(file1, file2); });
function createForceLayout(nodes,edges) {
var nodeHash = {};
for (x in nodes) {
nodeHash[nodes[x].id] = nodes[x];
}
for (x in edges) {
edges[x].weight = parseInt(edges[x].weight);
edges[x].source = nodeHash[edges[x].source];
edges[x].target = nodeHash[edges[x].target];
}
// chargeScale = d3.scale.linear().domain(d3.extent(nodes, function(d) {return d.followers})).range([-500,-2000])
// nodeSize = d3.scale.linear().domain(d3.extent(nodes, function(d) {return d.followers})).range([5,20])
var weightScale = d3.scale.linear().domain(d3.extent(edges, function(d) {return d.weight})).range([.1,1])
force = d3.layout.force()
// .charge(-1000)
.charge(function (d) {return d.weight * -500})
.gravity(.3)
// .linkDistance(50)
// .linkStrength(function (d) {return weightScale(d.weight)})
.size([500,500]).nodes(nodes)
.links(edges).on("tick", forceTick);
d3.select("svg").selectAll("line.link").data(edges, function (d) {return d.source.id + "-" + d.target.id}).enter()
.append("line")
.attr("class", "link")
.style("stroke", "black")
.style("opacity", .5)
.style("stroke-width", function(d) {return d.weight});
var nodeEnter = d3.select("svg").selectAll("g.node").data(nodes, function (d) {return d.id}).enter()
.append("g")
.attr("class", "node")
.call(force.drag())
.on("click", fixNode);
function fixNode(d) {
d3.select(this).select("circle").style("stroke-width", 4);
d.fixed = true;
}
nodeEnter.append("circle")
.attr("r", 5)
.style("fill", "lightgray")
.style("stroke", "black")
.style("stroke-width", "1px");
nodeEnter.append("text")
.style("text-anchor", "middle")
.attr("y", 15)
.text(function(d) {return d.id})
d3.selectAll("line").attr("marker-end", "url(#Triangle)");
force.start();
function forceTick() {
d3.selectAll("line.link")
.attr("x1", function (d) {return d.source.x})
.attr("x2", function (d) {return d.target.x})
.attr("y1", function (d) {return d.source.y})
.attr("y2", function (d) {return d.target.y});
d3.selectAll("g.node")
.attr("transform", function (d) {return "translate("+d.x+","+d.y+")"})
}
}
</script>
</footer>
</html>
Raw
nodelist.csv
id followers following
sam 17 500
roy 83 80
pris 904 15
tully 7 5
kim 11 50
mo 80 85
pat 150 300
lee 38 7
al 12 12
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