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Force tree transition chaining (incrementally showing nodes and links in a force graph); single nodes appear incrementally
# Editor backup files
*.bak
*~

Force graph with node-link show up through chaining …… ? 8

Derived from gist 1125997 and gist 2511921, but now shows the nodes appear incrementally.

This variant also chains the display of the links one by one; links are only shown once their nodes are visible.

The alternative, which fades in all relevant links all at once for each node which shows up, see gist 2511921.

var width = 960,
height = 500;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
var svg = d3.select("#chart").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("miserables.json", function(json) {
var t = Date.now(); // set start time to moment when data has actually loaded, so animation doesn't start as if already running for a while
force
.nodes(json.nodes)
.links(json.links)
.start();
var link = svg.selectAll("line.link")
.data(json.links)
.enter().append("line")
.attr("class", "link")
.attr("opacity",1e-6)
.style("stroke-width", function(d) {return Math.sqrt(d.value);})
.each(function(d, i, j) {
//d.pending = 1; // add 'pending' member to each enter()ed link object
});
//.each(appear());
var node = svg.selectAll("circle.node")
.data(json.nodes);
var nodeEnter = node.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.attr("opacity",1e-6)
.attr("id",function(d,i){return "c_"+i.toString()})
.style("fill", function(d) {return color(d.group);})
.each(appear())
.call(force.drag);
node.append("title")
.text(function(d) {return d.name;});
force.on("tick", function() {
link.attr("x1", function(d) {return d.source.x;})
.attr("y1", function(d) {return d.source.y;})
.attr("x2", function(d) {return d.target.x;})
.attr("y2", function(d) {return d.target.y;});
node.attr("cx", function(d) {return d.x;})
.attr("cy", function(d) {return d.y;});
});
function appear() {
return function(d, i, j) {
d.pending = 1; // add 'pending' member to each enter()ed node object
t += 200;
d3.select(this).transition()
.duration(1000)
.delay(t - Date.now())
.attr("opacity", 1)
.each("end", function(d, idx) {
//console.log('end: ', d, idx, this, t);
d.pending = 0;
// select the links for this node:
var nodes = json.nodes;
var links = json.links;
var neighbors;
var i, j, n = nodes.length, m = links.length;
var linkchain = [];
//console.log('nodes: ', n, m);
// we know that the FORCE LAYOUT adds the field 'index' to each node.
// We use that 'internals' knowledge here to match links with node d.
link.each(function(lnk, a, b) {
//console.log('link check: ', this, lnk, a, b);
// only show those links which have both endpoints (nodes) already showing.
//
// Note: this condition is sufficient to ensure all links are shown
// once all the nodes are shown.
if ((lnk.source == d || lnk.target == d) && !lnk.source.pending && !lnk.target.pending) {
linkchain.push(d3.select(this));
}
});
appear_link(linkchain);
});
};
}
function appear_link(chain) {
if (chain.length == 0) return;
chain.pop().transition()
.duration(1000)
.attr("opacity", 1)
.each("end", function() { appear_link(chain); });
}
});
<!DOCTYPE html>
<html>
<head>
<title>Force-Directed Layout</title>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.v2.js?2.9.1"></script>
<style>
circle.node {
stroke: #fff;
stroke-width: 1.5px;
}
line.link {
stroke: #999;
stroke-opacity: .6;
}
</style>
</head>
<body>
<div id="chart"></div>
<script type="text/javascript" src="force.js"></script>
</body>
</html>
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