Force-Directed Graph

.block

license: gpl-3.0
height: 600

README.md

This simple force-directed graph shows character co-occurence in Les Misérables. A physical simulation of charged particles and springs places related characters in closer proximity, while unrelated characters are farther apart. Layout algorithm inspired by Tim Dwyer and Thomas Jakobsen. Data based on character coappearence in Victor Hugo's Les Misérables, compiled by Donald Knuth.

Compare this display to a force layout with curved links, a force layout with fisheye distortion and a matrix diagram.

code.js

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

var color = d3.scaleOrdinal(d3.schemeCategory20);

var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().id(function(d) { return d.id; }))
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(width / 2, height / 2));

var selected = ["CountessdeLo"];

d3.json("miserables.txt", function(error, _graph) {
  if (error) throw error;
  graph = _graph;
  firstDraw();
});

var graph;
var link;
var node;
var link4Tick, node4Tick;
var nodeIndices = [];
var is2D = true;
//var selectedIndices = [];


function firstDraw() {
  link = svg.append("g")
      .attr("class", "links")
    .selectAll("line")
    .data(graph.links);

  node = svg.append("g")
      .attr("class", "nodes")
    .selectAll("circle")
    .data(graph.nodes);
 nodeIndices = d3.range(graph.nodes.length);

  node.append("title")
      .text(function(d) { return d.id; });

  simulation
      .nodes(graph.nodes)
      .on("tick", updateDraw);
  simulation.force("link")
      .links(graph.links);

  for (var i=0; i<1000; i++) {
      simulation.tick();
  }

  function ticked() {
    link4Tick
        .attr("x1", d => selected.includes(d.id) ? d.source.x-10 : 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; });

    node4Tick
        .attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
  }

  link4Tick = link.enter().append("line");

  node4Tick = node.enter().append("circle")
      .attr("title", d => d.id)
      .on("click", function(d,i){
          console.log(d);
          var index = selected.indexOf(d.id);
          if (index >= 0)
            selected.splice(index, 1);
          else if(d != null)
            selected.push(d.id);
          d.selected = true;
          updateDraw();
      });
  updateDraw();
}

function updateDraw() {
  var transition = d3.transition()
    .duration(0);

  for (var n=0; n<graph.nodes.length; n++) {
      graph.nodes[n].selected = selectionProximity(graph.nodes[n].id);
  } 

  link4Tick
      .data(graph.links)
      .transition(transition)
      .style("stroke", d => color( graph.nodes.find(n => n.id == d.target.id).group ))
      .attr("stroke-width", d => Math.pow(Math.max( d.source.selected, d.target.selected),2) + 1);
  node4Tick
      .data(nodeIndices.map(i => graph.nodes[i]))
      .transition(transition)
      .attr("stroke-width", (d => 0*d.selected))
      .attr("r", d => d.selected*2 + 5)
      .attr("fill", d => d3.hcl(color(d.group)).brighter(d.selected*1) );

  // position
  link4Tick
      //.transition(transition)
      .attr("x1", d => toSVGCoords(toWorldCoords(d.source), d.source.selected).x)
      .attr("y1", d => toSVGCoords(toWorldCoords(d.source), d.source.selected).y)
      .attr("x2", d => toSVGCoords(toWorldCoords(d.target), d.target.selected).x)
      .attr("y2", d => toSVGCoords(toWorldCoords(d.target), d.target.selected).y);

  node4Tick
      .transition(transition)
      .attr("cx", d => toSVGCoords(toWorldCoords(d), d.selected).x)
      .attr("cy", d => toSVGCoords(toWorldCoords(d), d.selected).y);
}

function selectionProximity(id) {
    // id is selected?
    if (selected.includes(id))
        return 2;
    // id's neighbor is selected?
    var neighbors1 = graph.links.filter(edge => edge.source.id == id).map(edge => edge.target.id);
    var neighbors2 = graph.links.filter(edge => edge.target.id == id).map(edge => edge.source.id);
    var neighbors = neighbors1.concat(neighbors2);
    if (neighbors.filter(n => selected.includes(n)).length > 0)
        return 1;

    // // id's neighbor's neighbor is selected?
    // for (var i=0; i<neighbors.length; i++) {
    //     var neighbor = neighbors[i];
    //     neighbors1 = graph.links.filter(edge => edge.source.id == neighbor).map(edge => edge.target.id);
    //     neighbors2 = graph.links.filter(edge => edge.target.id == neighbor).map(edge => edge.source.id);
    //     var neighborsneighbors = neighbors1.concat(neighbors2);
    //     if (neighborsneighbors.filter(n => selected.includes(n)).length > 0)
    //         return 1;
    // }
    return 0;
}

function toWorldCoords(thing, shift=.25) {
  shift = 1 + thing.selected * shift * is2D;
  return {
    x: (thing.x / width * 2 - 1) * shift,
    y: (thing.y / height * 2 - 1) * shift
  }
}

function toSVGCoords(thing) {
  return {
    x: (thing.x + 1) / 2 * width,
    y: (thing.y + 1) / 2 * height
  }
}

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>

svg { background-color: #333; }

line {
  stroke: #999;
  stroke-opacity: 0.6;
}

circle {
  stroke: #fff;
}

</style>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="code.js"></script>

jsconfig.json

{
    "compilerOptions": {
        "target": "ES6"
    },
    "exclude": [
        "node_modules"
    ]
}

miserables.txt

{
  "nodes": [
    {"id": "Myriel", "group": 1},
    {"id": "Napoleon", "group": 1},
    {"id": "Mlle.Baptistine", "group": 1},
    {"id": "Mme.Magloire", "group": 1},
    {"id": "CountessdeLo", "group": 1},
    {"id": "Geborand", "group": 1},
    {"id": "Champtercier", "group": 1},
    {"id": "Cravatte", "group": 1},
    {"id": "Count", "group": 1},
    {"id": "OldMan", "group": 1},
    {"id": "Labarre", "group": 2},
    {"id": "Valjean", "group": 2},
    {"id": "Marguerite", "group": 3},
    {"id": "Mme.deR", "group": 2},
    {"id": "Isabeau", "group": 2},
    {"id": "Gervais", "group": 2},
    {"id": "Tholomyes", "group": 3},
    {"id": "Listolier", "group": 3},
    {"id": "Fameuil", "group": 3},
    {"id": "Blacheville", "group": 3},
    {"id": "Favourite", "group": 3},
    {"id": "Dahlia", "group": 3},
    {"id": "Zephine", "group": 3},
    {"id": "Fantine", "group": 3},
    {"id": "Mme.Thenardier", "group": 4},
    {"id": "Thenardier", "group": 4},
    {"id": "Cosette", "group": 5},
    {"id": "Javert", "group": 4},
    {"id": "Fauchelevent", "group": 0},
    {"id": "Bamatabois", "group": 2},
    {"id": "Perpetue", "group": 3},
    {"id": "Simplice", "group": 2},
    {"id": "Scaufflaire", "group": 2},
    {"id": "Woman1", "group": 2},
    {"id": "Judge", "group": 2},
    {"id": "Champmathieu", "group": 2},
    {"id": "Brevet", "group": 2},
    {"id": "Chenildieu", "group": 2},
    {"id": "Cochepaille", "group": 2},
    {"id": "Pontmercy", "group": 4},
    {"id": "Boulatruelle", "group": 6},
    {"id": "Eponine", "group": 4},
    {"id": "Anzelma", "group": 4},
    {"id": "Woman2", "group": 5},
    {"id": "MotherInnocent", "group": 0},
    {"id": "Gribier", "group": 0},
    {"id": "Jondrette", "group": 7},
    {"id": "Mme.Burgon", "group": 7},
    {"id": "Gavroche", "group": 8},
    {"id": "Gillenormand", "group": 5},
    {"id": "Magnon", "group": 5},
    {"id": "Mlle.Gillenormand", "group": 5},
    {"id": "Mme.Pontmercy", "group": 5},
    {"id": "Mlle.Vaubois", "group": 5},
    {"id": "Lt.Gillenormand", "group": 5},
    {"id": "Marius", "group": 8},
    {"id": "BaronessT", "group": 5},
    {"id": "Mabeuf", "group": 8},
    {"id": "Enjolras", "group": 8},
    {"id": "Combeferre", "group": 8},
    {"id": "Prouvaire", "group": 8},
    {"id": "Feuilly", "group": 8},
    {"id": "Courfeyrac", "group": 8},
    {"id": "Bahorel", "group": 8},
    {"id": "Bossuet", "group": 8},
    {"id": "Joly", "group": 8},
    {"id": "Grantaire", "group": 8},
    {"id": "MotherPlutarch", "group": 9},
    {"id": "Gueulemer", "group": 4},
    {"id": "Babet", "group": 4},
    {"id": "Claquesous", "group": 4},
    {"id": "Montparnasse", "group": 4},
    {"id": "Toussaint", "group": 5},
    {"id": "Child1", "group": 10},
    {"id": "Child2", "group": 10},
    {"id": "Brujon", "group": 4},
    {"id": "Mme.Hucheloup", "group": 8}
  ],
  "links": [
    {"source": "Napoleon", "target": "Myriel", "value": 1},
    {"source": "Mlle.Baptistine", "target": "Myriel", "value": 8},
    {"source": "Mme.Magloire", "target": "Myriel", "value": 10},
    {"source": "Mme.Magloire", "target": "Mlle.Baptistine", "value": 6},
    {"source": "CountessdeLo", "target": "Myriel", "value": 1},
    {"source": "Geborand", "target": "Myriel", "value": 1},
    {"source": "Champtercier", "target": "Myriel", "value": 1},
    {"source": "Cravatte", "target": "Myriel", "value": 1},
    {"source": "Count", "target": "Myriel", "value": 2},
    {"source": "OldMan", "target": "Myriel", "value": 1},
    {"source": "Valjean", "target": "Labarre", "value": 1},
    {"source": "Valjean", "target": "Mme.Magloire", "value": 3},
    {"source": "Valjean", "target": "Mlle.Baptistine", "value": 3},
    {"source": "Valjean", "target": "Myriel", "value": 5},
    {"source": "Marguerite", "target": "Valjean", "value": 1},
    {"source": "Mme.deR", "target": "Valjean", "value": 1},
    {"source": "Isabeau", "target": "Valjean", "value": 1},
    {"source": "Gervais", "target": "Valjean", "value": 1},
    {"source": "Listolier", "target": "Tholomyes", "value": 4},
    {"source": "Fameuil", "target": "Tholomyes", "value": 4},
    {"source": "Fameuil", "target": "Listolier", "value": 4},
    {"source": "Blacheville", "target": "Tholomyes", "value": 4},
    {"source": "Blacheville", "target": "Listolier", "value": 4},
    {"source": "Blacheville", "target": "Fameuil", "value": 4},
    {"source": "Favourite", "target": "Tholomyes", "value": 3},
    {"source": "Favourite", "target": "Listolier", "value": 3},
    {"source": "Favourite", "target": "Fameuil", "value": 3},
    {"source": "Favourite", "target": "Blacheville", "value": 4},
    {"source": "Dahlia", "target": "Tholomyes", "value": 3},
    {"source": "Dahlia", "target": "Listolier", "value": 3},
    {"source": "Dahlia", "target": "Fameuil", "value": 3},
    {"source": "Dahlia", "target": "Blacheville", "value": 3},
    {"source": "Dahlia", "target": "Favourite", "value": 5},
    {"source": "Zephine", "target": "Tholomyes", "value": 3},
    {"source": "Zephine", "target": "Listolier", "value": 3},
    {"source": "Zephine", "target": "Fameuil", "value": 3},
    {"source": "Zephine", "target": "Blacheville", "value": 3},
    {"source": "Zephine", "target": "Favourite", "value": 4},
    {"source": "Zephine", "target": "Dahlia", "value": 4},
    {"source": "Fantine", "target": "Tholomyes", "value": 3},
    {"source": "Fantine", "target": "Listolier", "value": 3},
    {"source": "Fantine", "target": "Fameuil", "value": 3},
    {"source": "Fantine", "target": "Blacheville", "value": 3},
    {"source": "Fantine", "target": "Favourite", "value": 4},
    {"source": "Fantine", "target": "Dahlia", "value": 4},
    {"source": "Fantine", "target": "Zephine", "value": 4},
    {"source": "Fantine", "target": "Marguerite", "value": 2},
    {"source": "Fantine", "target": "Valjean", "value": 9},
    {"source": "Mme.Thenardier", "target": "Fantine", "value": 2},
    {"source": "Mme.Thenardier", "target": "Valjean", "value": 7},
    {"source": "Thenardier", "target": "Mme.Thenardier", "value": 13},
    {"source": "Thenardier", "target": "Fantine", "value": 1},
    {"source": "Thenardier", "target": "Valjean", "value": 12},
    {"source": "Cosette", "target": "Mme.Thenardier", "value": 4},
    {"source": "Cosette", "target": "Valjean", "value": 31},
    {"source": "Cosette", "target": "Tholomyes", "value": 1},
    {"source": "Cosette", "target": "Thenardier", "value": 1},
    {"source": "Javert", "target": "Valjean", "value": 17},
    {"source": "Javert", "target": "Fantine", "value": 5},
    {"source": "Javert", "target": "Thenardier", "value": 5},
    {"source": "Javert", "target": "Mme.Thenardier", "value": 1},
    {"source": "Javert", "target": "Cosette", "value": 1},
    {"source": "Fauchelevent", "target": "Valjean", "value": 8},
    {"source": "Fauchelevent", "target": "Javert", "value": 1},
    {"source": "Bamatabois", "target": "Fantine", "value": 1},
    {"source": "Bamatabois", "target": "Javert", "value": 1},
    {"source": "Bamatabois", "target": "Valjean", "value": 2},
    {"source": "Perpetue", "target": "Fantine", "value": 1},
    {"source": "Simplice", "target": "Perpetue", "value": 2},
    {"source": "Simplice", "target": "Valjean", "value": 3},
    {"source": "Simplice", "target": "Fantine", "value": 2},
    {"source": "Simplice", "target": "Javert", "value": 1},
    {"source": "Scaufflaire", "target": "Valjean", "value": 1},
    {"source": "Woman1", "target": "Valjean", "value": 2},
    {"source": "Woman1", "target": "Javert", "value": 1},
    {"source": "Judge", "target": "Valjean", "value": 3},
    {"source": "Judge", "target": "Bamatabois", "value": 2},
    {"source": "Champmathieu", "target": "Valjean", "value": 3},
    {"source": "Champmathieu", "target": "Judge", "value": 3},
    {"source": "Champmathieu", "target": "Bamatabois", "value": 2},
    {"source": "Brevet", "target": "Judge", "value": 2},
    {"source": "Brevet", "target": "Champmathieu", "value": 2},
    {"source": "Brevet", "target": "Valjean", "value": 2},
    {"source": "Brevet", "target": "Bamatabois", "value": 1},
    {"source": "Chenildieu", "target": "Judge", "value": 2},
    {"source": "Chenildieu", "target": "Champmathieu", "value": 2},
    {"source": "Chenildieu", "target": "Brevet", "value": 2},
    {"source": "Chenildieu", "target": "Valjean", "value": 2},
    {"source": "Chenildieu", "target": "Bamatabois", "value": 1},
    {"source": "Cochepaille", "target": "Judge", "value": 2},
    {"source": "Cochepaille", "target": "Champmathieu", "value": 2},
    {"source": "Cochepaille", "target": "Brevet", "value": 2},
    {"source": "Cochepaille", "target": "Chenildieu", "value": 2},
    {"source": "Cochepaille", "target": "Valjean", "value": 2},
    {"source": "Cochepaille", "target": "Bamatabois", "value": 1},
    {"source": "Pontmercy", "target": "Thenardier", "value": 1},
    {"source": "Boulatruelle", "target": "Thenardier", "value": 1},
    {"source": "Eponine", "target": "Mme.Thenardier", "value": 2},
    {"source": "Eponine", "target": "Thenardier", "value": 3},
    {"source": "Anzelma", "target": "Eponine", "value": 2},
    {"source": "Anzelma", "target": "Thenardier", "value": 2},
    {"source": "Anzelma", "target": "Mme.Thenardier", "value": 1},
    {"source": "Woman2", "target": "Valjean", "value": 3},
    {"source": "Woman2", "target": "Cosette", "value": 1},
    {"source": "Woman2", "target": "Javert", "value": 1},
    {"source": "MotherInnocent", "target": "Fauchelevent", "value": 3},
    {"source": "MotherInnocent", "target": "Valjean", "value": 1},
    {"source": "Gribier", "target": "Fauchelevent", "value": 2},
    {"source": "Mme.Burgon", "target": "Jondrette", "value": 1},
    {"source": "Gavroche", "target": "Mme.Burgon", "value": 2},
    {"source": "Gavroche", "target": "Thenardier", "value": 1},
    {"source": "Gavroche", "target": "Javert", "value": 1},
    {"source": "Gavroche", "target": "Valjean", "value": 1},
    {"source": "Gillenormand", "target": "Cosette", "value": 3},
    {"source": "Gillenormand", "target": "Valjean", "value": 2},
    {"source": "Magnon", "target": "Gillenormand", "value": 1},
    {"source": "Magnon", "target": "Mme.Thenardier", "value": 1},
    {"source": "Mlle.Gillenormand", "target": "Gillenormand", "value": 9},
    {"source": "Mlle.Gillenormand", "target": "Cosette", "value": 2},
    {"source": "Mlle.Gillenormand", "target": "Valjean", "value": 2},
    {"source": "Mme.Pontmercy", "target": "Mlle.Gillenormand", "value": 1},
    {"source": "Mme.Pontmercy", "target": "Pontmercy", "value": 1},
    {"source": "Mlle.Vaubois", "target": "Mlle.Gillenormand", "value": 1},
    {"source": "Lt.Gillenormand", "target": "Mlle.Gillenormand", "value": 2},
    {"source": "Lt.Gillenormand", "target": "Gillenormand", "value": 1},
    {"source": "Lt.Gillenormand", "target": "Cosette", "value": 1},
    {"source": "Marius", "target": "Mlle.Gillenormand", "value": 6},
    {"source": "Marius", "target": "Gillenormand", "value": 12},
    {"source": "Marius", "target": "Pontmercy", "value": 1},
    {"source": "Marius", "target": "Lt.Gillenormand", "value": 1},
    {"source": "Marius", "target": "Cosette", "value": 21},
    {"source": "Marius", "target": "Valjean", "value": 19},
    {"source": "Marius", "target": "Tholomyes", "value": 1},
    {"source": "Marius", "target": "Thenardier", "value": 2},
    {"source": "Marius", "target": "Eponine", "value": 5},
    {"source": "Marius", "target": "Gavroche", "value": 4},
    {"source": "BaronessT", "target": "Gillenormand", "value": 1},
    {"source": "BaronessT", "target": "Marius", "value": 1},
    {"source": "Mabeuf", "target": "Marius", "value": 1},
    {"source": "Mabeuf", "target": "Eponine", "value": 1},
    {"source": "Mabeuf", "target": "Gavroche", "value": 1},
    {"source": "Enjolras", "target": "Marius", "value": 7},
    {"source": "Enjolras", "target": "Gavroche", "value": 7},
    {"source": "Enjolras", "target": "Javert", "value": 6},
    {"source": "Enjolras", "target": "Mabeuf", "value": 1},
    {"source": "Enjolras", "target": "Valjean", "value": 4},
    {"source": "Combeferre", "target": "Enjolras", "value": 15},
    {"source": "Combeferre", "target": "Marius", "value": 5},
    {"source": "Combeferre", "target": "Gavroche", "value": 6},
    {"source": "Combeferre", "target": "Mabeuf", "value": 2},
    {"source": "Prouvaire", "target": "Gavroche", "value": 1},
    {"source": "Prouvaire", "target": "Enjolras", "value": 4},
    {"source": "Prouvaire", "target": "Combeferre", "value": 2},
    {"source": "Feuilly", "target": "Gavroche", "value": 2},
    {"source": "Feuilly", "target": "Enjolras", "value": 6},
    {"source": "Feuilly", "target": "Prouvaire", "value": 2},
    {"source": "Feuilly", "target": "Combeferre", "value": 5},
    {"source": "Feuilly", "target": "Mabeuf", "value": 1},
    {"source": "Feuilly", "target": "Marius", "value": 1},
    {"source": "Courfeyrac", "target": "Marius", "value": 9},
    {"source": "Courfeyrac", "target": "Enjolras", "value": 17},
    {"source": "Courfeyrac", "target": "Combeferre", "value": 13},
    {"source": "Courfeyrac", "target": "Gavroche", "value": 7},
    {"source": "Courfeyrac", "target": "Mabeuf", "value": 2},
    {"source": "Courfeyrac", "target": "Eponine", "value": 1},
    {"source": "Courfeyrac", "target": "Feuilly", "value": 6},
    {"source": "Courfeyrac", "target": "Prouvaire", "value": 3},
    {"source": "Bahorel", "target": "Combeferre", "value": 5},
    {"source": "Bahorel", "target": "Gavroche", "value": 5},
    {"source": "Bahorel", "target": "Courfeyrac", "value": 6},
    {"source": "Bahorel", "target": "Mabeuf", "value": 2},
    {"source": "Bahorel", "target": "Enjolras", "value": 4},
    {"source": "Bahorel", "target": "Feuilly", "value": 3},
    {"source": "Bahorel", "target": "Prouvaire", "value": 2},
    {"source": "Bahorel", "target": "Marius", "value": 1},
    {"source": "Bossuet", "target": "Marius", "value": 5},
    {"source": "Bossuet", "target": "Courfeyrac", "value": 12},
    {"source": "Bossuet", "target": "Gavroche", "value": 5},
    {"source": "Bossuet", "target": "Bahorel", "value": 4},
    {"source": "Bossuet", "target": "Enjolras", "value": 10},
    {"source": "Bossuet", "target": "Feuilly", "value": 6},
    {"source": "Bossuet", "target": "Prouvaire", "value": 2},
    {"source": "Bossuet", "target": "Combeferre", "value": 9},
    {"source": "Bossuet", "target": "Mabeuf", "value": 1},
    {"source": "Bossuet", "target": "Valjean", "value": 1},
    {"source": "Joly", "target": "Bahorel", "value": 5},
    {"source": "Joly", "target": "Bossuet", "value": 7},
    {"source": "Joly", "target": "Gavroche", "value": 3},
    {"source": "Joly", "target": "Courfeyrac", "value": 5},
    {"source": "Joly", "target": "Enjolras", "value": 5},
    {"source": "Joly", "target": "Feuilly", "value": 5},
    {"source": "Joly", "target": "Prouvaire", "value": 2},
    {"source": "Joly", "target": "Combeferre", "value": 5},
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  ]
}

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