block by GerHobbelt 2514183

Force tree transition chaining (incrementally showing nodes and links in a force graph); single nodes appear incrementally

Full Screen

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.

index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Force-Directed Layout</title>
    <script type="text/javascript" src="//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>

force.js

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); });
  }
});

miserables.json

{"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},{"source":2,"target":0,"value":8},{"source":3,"target":0,"value":10},{"source":3,"target":2,"value":6},{"source":4,"target":0,"value":1},{"source":5,"target":0,"value":1},{"source":6,"target":0,"value":1},{"source":7,"target":0,"value":1},{"source":8,"target":0,"value":2},{"source":9,"target":0,"value":1},{"source":11,"target":10,"value":1},{"source":11,"target":3,"value":3},{"source":11,"target":2,"value":3},{"source":11,"target":0,"value":5},{"source":12,"target":11,"value":1},{"source":13,"target":11,"value":1},{"source":14,"target":11,"value":1},{"source":15,"target":11,"value":1},{"source":17,"target":16,"value":4},{"source":18,"target":16,"value":4},{"source":18,"target":17,"value":4},{"source":19,"target":16,"value":4},{"source":19,"target":17,"value":4},{"source":19,"target":18,"value":4},{"source":20,"target":16,"value":3},{"source":20,"target":17,"value":3},{"source":20,"target":18,"value":3},{"source":20,"target":19,"value":4},{"source":21,"target":16,"value":3},{"source":21,"target":17,"value":3},{"source":21,"target":18,"value":3},{"source":21,"target":19,"value":3},{"source":21,"target":20,"value":5},{"source":22,"target":16,"value":3},{"source":22,"target":17,"value":3},{"source":22,"target":18,"value":3},{"source":22,"target":19,"value":3},{"source":22,"target":20,"value":4},{"source":22,"target":21,"value":4},{"source":23,"target":16,"value":3},{"source":23,"target":17,"value":3},{"source":23,"target":18,"value":3},{"source":23,"target":19,"value":3},{"source":23,"target":20,"value":4},{"source":23,"target":21,"value":4},{"source":23,"target":22,"value":4},{"source":23,"target":12,"value":2},{"source":23,"target":11,"value":9},{"source":24,"target":23,"value":2},{"source":24,"target":11,"value":7},{"source":25,"target":24,"value":13},{"source":25,"target":23,"value":1},{"source":25,"target":11,"value":12},{"source":26,"target":24,"value":4},{"source":26,"target":11,"value":31},{"source":26,"target":16,"value":1},{"source":26,"target":25,"value":1},{"source":27,"target":11,"value":17},{"source":27,"target":23,"value":5},{"source":27,"target":25,"value":5},{"source":27,"target":24,"value":1},{"source":27,"target":26,"value":1},{"source":28,"target":11,"value":8},{"source":28,"target":27,"value":1},{"source":29,"target":23,"value":1},{"source":29,"target":27,"value":1},{"source":29,"target":11,"value":2},{"source":30,"target":23,"value":1},{"source":31,"target":30,"value":2},{"source":31,"target":11,"value":3},{"source":31,"target":23,"value":2},{"source":31,"target":27,"value":1},{"source":32,"target":11,"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