HP Books:Spells Force Layout

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <body>
  <script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://unpkg.com/d3-force-cluster@latest"></script>
    <script>

var width = 960,
    height = 500,
    padding = 1.5, // separation between same-color nodes
    clusterPadding = 6, // separation between different-color nodes
    maxRadius = 8;

var n = 200, // total number of nodes
    m = 7; // number of distinct clusters--# of books

var color = d3.scaleSequential(d3.interpolateRainbow)
    .domain(d3.range(m));

// The largest node for each cluster.
var clusters = new Array(m);

var nodes = d3.range(n).map(function () {
  //make i be according to book
  //radius size kept random for now
  var i = Math.floor(Math.random() * m),
      r = Math.sqrt((i + 1) / m * -Math.log(Math.random())) * maxRadius,
      d = {
        cluster: i,
        radius: r,
        x: Math.cos(i / m * 2 * Math.PI) * 150 + width / 2 + Math.random(),
        y: Math.sin(i / m * 2 * Math.PI) * 150 + height / 2 + Math.random()
      };
  if (!clusters[i] || (r > clusters[i].radius)) clusters[i] = d;
  return d;
});

var simulation = d3.forceSimulation()
  // keep entire simulation balanced around screen center
  .force('center', d3.forceCenter(width/2, height/2))

// cluster by section
  .force('cluster', d3.forceCluster()
    .centers(function (d) { return clusters[d.cluster]; })
    .strength(0.5))

// apply collision with padding
  .force('collide', d3.forceCollide(function (d) { return d.radius + padding; }))

.on('tick', layoutTick)
  .nodes(nodes);
  
var svg = d3.select('body').append('svg')
    .attr('width', width)
    .attr('height', height);

https://d3js.org/d3.v4.min.js

https://unpkg.com/d3-force-cluster@latest