fresh block

<!DOCTYPE html>
<meta charset="utf-8">
<canvas width="960" height="600"></canvas>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var canvas = document.querySelector("canvas"),
    context = canvas.getContext("2d"),
    width = canvas.width,
    height = canvas.height;

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 nodeColors = d3.scaleOrdinal().range(d3.schemeCategory20),
      labelColors = d3.scaleOrdinal().range(['white', 'orange', 'blue', 'black', 'purple']);

d3.json("miserables.json", function(error, graph) {
  if (error) throw error;

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

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

d3.select(canvas)
      .call(d3.drag()
          .container(canvas)
          .subject(dragsubject)
          .on("start", dragstarted)
          .on("drag", dragged)
          .on("end", dragended));

function ticked() {
    context.clearRect(0, 0, width, height);

context.beginPath();
    graph.links.forEach(drawLink);
    context.strokeStyle = "#aaa";
    context.stroke();

context.beginPath();
    graph.nodes.forEach(drawNode);
    context.fill();
    context.strokeStyle = "#fff";
    context.stroke();
  }

function dragsubject() {
    return simulation.find(d3.event.x, d3.event.y);
  }
});

function dragstarted() {
  if (!d3.event.active) simulation.alphaTarget(0.3).restart();
  d3.event.subject.fx = d3.event.subject.x;
  d3.event.subject.fy = d3.event.subject.y;
}

function dragged() {
  d3.event.subject.fx = d3.event.x;
  d3.event.subject.fy = d3.event.y;
}

function dragended() {
  if (!d3.event.active) simulation.alphaTarget(0);
  d3.event.subject.fx = null;
  d3.event.subject.fy = null;
}

function drawLink(d) {
  context.moveTo(d.source.x, d.source.y);
  context.lineTo(d.target.x, d.target.y);
}

function drawNode(d) {
  context.beginPath(); 
  context.moveTo(d.x+10, d.y);
  context.arc(d.x, d.y, 10, 0, 2 * Math.PI);
  context.fillStyle = nodeColors(d.group); 
  context.fill();
  context.strokeStyle = "#fff";
  context.stroke();
  context.fillStyle = labelColors(d.group);
  context.font = (d.labelSize ? d.labelSize : 13)+'px Arial';
  context.fillText(d.label ? d.label : d.group, d.x,d.y);
}

</script>

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