Skip to content

Instantly share code, notes, and snippets.

@ericcoopey
Last active August 29, 2015 14:15
Show Gist options
  • Save ericcoopey/707dc711806a34f5c56e to your computer and use it in GitHub Desktop.
Save ericcoopey/707dc711806a34f5c56e to your computer and use it in GitHub Desktop.
Directed Force Diagram - Social Network

A force diagram using a marker to indicate direction. Also demonstrates how to transform the path to have the lines arc.

This one represents a social network diagram. Relationship strength is encoded in the path length, with stronger relationships having shorter path lengths.

{
"nodes":[
{
"name":"Ilya I",
"group":0
},
{
"name":"Betty B",
"group":1
},
{
"name":"Andy N",
"group":2
},
{
"name":"Harper P",
"group":3
},
{
"name":"Holly V",
"group":4
},
{
"name":"Elijah W",
"group":5
},
{
"name":"Kalvin L",
"group":6
},
{
"name":"Chris D",
"group":7
},
{
"name":"Alexa U",
"group":8
}
],
"links":[
{
"source":2,
"target":5,
"value":1,
"type":"arrow"
},
{
"source":2,
"target":6,
"value":3,
"type":"arrow"
},
{
"source":2,
"target":7,
"value":1,
"type":"arrow"
},
{
"source":2,
"target":8,
"value":1,
"type":"arrow"
},
{
"source":3,
"target":2,
"value":1,
"type":"arrow"
},
{
"source":3,
"target":4,
"value":1,
"type":"arrow"
},
{
"source":3,
"target":6,
"value":2,
"type":"arrow"
},
{
"source":3,
"target":7,
"value":1,
"type":"arrow"
},
{
"source":3,
"target":8,
"value":3,
"type":"arrow"
},
{
"source":5,
"target":5,
"value":1,
"type":"arrow"
},
{
"source":6,
"target":2,
"value":1,
"type":"arrow"
}
]
}
<!DOCTYPE html>
<html>
<head>
<title>D3 Matrix Example</title>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</head><style>
path.link {
fill: none;
stroke: #666;
stroke-width: 1.5px;
}
path.link.twofive {
opacity: 0.25;
}
path.link.fivezero {
opacity: 0.50;
}
path.link.sevenfive {
opacity: 0.75;
}
path.link.onezerozero {
opacity: 1.0;
}
circle {
fill: #ccc;
stroke: #fff;
stroke-width: 1.5px;
}
text {
fill: #000;
pointer-events: none;
}
#content {
padding: 7px;
}
</style>
<body>
</body>
<script>
// get the data
var nodecolor = d3.scale.category20();
d3.json("data.json", function(error, graph) {
var nodes = {};
// Compute the distinct nodes from the links.
var links = graph.links;
var width = 900,
height = 600;
var force = d3.layout.force()
.nodes(graph.nodes)
.links(links)
.size([width, height])
.linkDistance(function(d) {
return 1/d.value * 250;
})
.charge(-500)
.on("tick", tick)
.start();
// Set the range
var v = d3.scale.linear().range([0, 100]);
// Scale the range of the data
v.domain([0, d3.max(links, function(d) { return d.value; })]);
// asign a type per value to encode opacity
links.forEach(function(link) {
if (v(link.value) <= 25) {
link.type = "twofive";
} else if (v(link.value) <= 50 && v(link.value) > 25) {
link.type = "fivezero";
} else if (v(link.value) <= 75 && v(link.value) > 50) {
link.type = "sevenfive";
} else if (v(link.value) <= 100 && v(link.value) > 75) {
link.type = "onezerozero";
}
});
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
// build the arrow.
svg.append("svg:defs").selectAll("marker")
.data(["end"]) // Different link/path types can be defined here
.enter().append("svg:marker") // This section adds in the arrows
.attr("id", String)
.attr("viewBox", "0 -5 10 10")
.attr("refX", 15)
.attr("refY", -1.5)
.attr("markerWidth", 6)
.attr("markerHeight", 6)
.attr("orient", "auto")
.append("svg:path")
.attr("d", "M0,-5L10,0L0,5");
// add the links and the arrows
var path = svg.append("svg:g").selectAll("path")
.data(force.links())
.enter().append("svg:path")
.attr("class", function(d) { return "link " + d.type; })
.attr("marker-end", "url(#end)");
// define the nodes
var node = svg.selectAll(".node")
.data(force.nodes())
.enter().append("g")
.attr("class", "node")
.on("click", click)
.on("dblclick", dblclick)
.call(force.drag);
// add the nodes
node.append("circle")
.attr("r", 5)
.style("fill", function(d) {
return nodecolor(d.group);
});
// add the text
node.append("text")
.attr("x", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name; });
// add the curvy lines
function tick() {
path.attr("d", function(d) {
var dx = d.target.x - d.source.x,
dy = d.target.y - d.source.y,
dr = Math.sqrt(dx * dx + dy * dy);
return "M" +
d.source.x + "," +
d.source.y + "A" +
dr + "," + dr + " 0 0,1 " +
d.target.x + "," +
d.target.y;
});
node
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")"; });
}
// action to take on mouse click
function click() {
d3.select(this).select("text").transition()
.duration(750)
.attr("x", 22)
.style("fill", "steelblue")
.style("stroke", "lightsteelblue")
.style("stroke-width", ".5px");
d3.select(this).select("circle").transition()
.duration(750)
.attr("r", 16)
.style("fill", function(d) {
return nodecolor(d.group);
});
}
// action to take on mouse double click
function dblclick() {
d3.select(this).select("circle").transition()
.duration(750)
.attr("r", 6)
.style("fill", function(d) {
return nodecolor(d.group);
});
d3.select(this).select("text").transition()
.duration(750)
.attr("x", 12)
.style("stroke", "none")
.style("fill", "black")
.style("stroke", "none")
.style("font", "10px sans-serif");
}
});
</script>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment