Force simulation - test

Grouped nodes + links

by navinleon

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.1.1/d3.min.js"></script>
<svg width="960" height="600"></svg>

CSS

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

.nodes circle {
  stroke: #fff;
  stroke-width: 1.5px;
} 300px;

JavaScript

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 / 4, height / 3));

  var nodes = [
    {"id": "Aug", "name": "Paul" },
    {"id": "Aug", "name": "Ian" },
    {"id": "Aug", "name": "Andy" },
    {"id": "Sep", "name": "Gabby" },
    {"id": "Sep", "name": "Vicky" },
    {"id": "Oct", "name": "Dylan" },
    {"id": "Oct", "name": "Finley" },
    {"id": "Oct", "name": "Rudi" }
  ]
  var links = [
    {"source": "Aug", "target": "Aug" },
    {"source": "Aug", "target": "Aug" },
    {"source": "Aug", "target": "Aug" },
    {"source": "Sep", "target": "Sep" },
    {"source": "Sep", "target": "Sep" },
    {"source": "Oct", "target": "Oct" },
    {"source": "Oct", "target": "Oct" }
  ]

  var link = svg.append("g")
    .attr("class", "links")
    .selectAll("line")
    .data(links)
    .enter()
      .append("line")
      .attr("stroke-width",2);
      
  var node = svg.append("g")
    .attr("class", "nodes")
    .selectAll("circle")
    .data(nodes)
    .enter()
      .append("circle")
      .attr("r", 6)
      .attr("fill", function(d) { return color(d.id); })


		var label = svg.selectAll(".mytext")
      .data(nodes)
      .enter()
      .append("text")
        .text(function (d) { return d.name; })
        .style("text-anchor", "middle")
        .style("fill", "#555")
        .style("font-family", "Arial")
        .style("font-size", 12);

  simulation
      .nodes(nodes)
      .on("tick", ticked);

  simulation.force("link")
      .links(links);

  function ticked() {
    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...