Based on Mike Bostock's force-directed graph example showing character co-occurence in Les Misérables, this gist shows how to implement a dynamic link-display threshold. (The slider is based on Bostock's "brush as slider" block.) See this blog post on bilateral migration for an example use case.
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July 28, 2022 20:43
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Graph with Threshold Slider
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.node { | |
stroke: #fff; | |
stroke-width: 1.5px; | |
} | |
.link { | |
stroke: #999; | |
stroke-opacity: .6; | |
} | |
.axis { | |
opacity: 0.5; | |
font: 10px sans-serif; | |
-webkit-user-select: none; | |
-moz-user-select: none; | |
user-select: none; | |
} | |
.axis .domain { | |
fill: none; | |
stroke: #000; | |
stroke-opacity: .3; | |
stroke-width: 4px; | |
stroke-linecap: round; | |
} | |
.axis .halo { | |
fill: none; | |
stroke: #ddd; | |
stroke-width: 3px; | |
stroke-linecap: round; | |
} | |
.slider .handle { | |
fill: #fff; | |
stroke: #000; | |
stroke-opacity: .5; | |
stroke-width: 1.25px; | |
cursor: grab; | |
} | |
</style> | |
<body> | |
<script src="https://d3js.org/d3.v3.min.js"></script> | |
<script> | |
var width = 960, | |
height = 500; | |
var color = d3.scale.category20(); | |
var force = d3.layout.force() | |
.charge(-120) | |
.linkDistance(30) | |
.size([width, height]); | |
var x = d3.scale.linear() | |
.domain([0, 20]) | |
.range([250, 80]) | |
.clamp(true); | |
var brush = d3.svg.brush() | |
.y(x) | |
.extent([0, 0]); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
var links_g = svg.append("g"); | |
var nodes_g = svg.append("g"); | |
svg.append("g") | |
.attr("class", "x axis") | |
.attr("transform", "translate(" + (width - 20) + ",0)") | |
.call(d3.svg.axis() | |
.scale(x) | |
.orient("left") | |
.tickFormat(function(d) { return d; }) | |
.tickSize(0) | |
.tickPadding(12)) | |
.select(".domain") | |
.select(function() { return this.parentNode.appendChild(this.cloneNode(true)); }) | |
.attr("class", "halo"); | |
var slider = svg.append("g") | |
.attr("class", "slider") | |
.call(brush); | |
slider.selectAll(".extent,.resize") | |
.remove(); | |
var handle = slider.append("circle") | |
.attr("class", "handle") | |
.attr("transform", "translate(" + (width - 20) + ",0)") | |
.attr("r", 5); | |
svg.append("text") | |
.attr("x", width - 15) | |
.attr("y", 60) | |
.attr("text-anchor", "end") | |
.attr("font-size", "12px") | |
.style("opacity", 0.5) | |
.text("co-occurence threshold") | |
d3.json("miserables.json", function(error, graph) { | |
if (error) throw error; | |
graph.links.forEach(function(d,i){ d.i = i; }); | |
function brushed() { | |
var value = brush.extent()[0]; | |
if (d3.event.sourceEvent) { | |
value = x.invert(d3.mouse(this)[1]); | |
brush.extent([value, value]); | |
} | |
handle.attr("cy", x(value)); | |
var threshold = value; | |
var thresholded_links = graph.links.filter(function(d){ return (d.value > threshold);}); | |
force | |
.links(thresholded_links); | |
var link = links_g.selectAll(".link") | |
.data(thresholded_links, function(d){ return d.i; }); | |
link.enter().append("line") | |
.attr("class", "link") | |
.style("stroke-width", function(d) { return Math.sqrt(d.value); }); | |
link.exit().remove(); | |
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; }); | |
}); | |
force.start(); | |
} | |
force | |
.nodes(graph.nodes); | |
var node = nodes_g.selectAll(".node") | |
.data(graph.nodes) | |
.enter().append("circle") | |
.attr("class", "node") | |
.attr("r", 5) | |
.style("fill", function(d) { return color(d.group); }) | |
.call(force.drag); | |
node.append("title") | |
.text(function(d) { return d.name; }); | |
brush.on("brush", brushed); | |
slider | |
.call(brush.extent([5, 5])) | |
.call(brush.event); | |
}); | |
</script> | |
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{ | |
"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}, | |
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] | |
} |
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