Topojson Import into Force-Directed II

An update that uses a mercator projection to place each country at its centroid so you can understand how Europe is connected to South America.

<html xmlns="https://www.w3.org/1999/xhtml">
<head>
  <title>topojson import into force directed network II</title>
  <meta charset="utf-8" />
</head>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<style>

</style>
<body onload="forceDirected();">
<div id="controls">
</div>
<div id="vizcontainer">
<svg style="width:500px;height:500px;border:1px lightgray solid;" />
</div>

function forceDirected() {
    d3.json("/emeeks/raw/9980626/world.json", createForceLayout)

d3.select("svg").selectAll("line.link").data(edges).enter()
      .append("line")
      .attr("class", "link")
      .style("stroke", "black")
      .style("opacity", .5)
      .style("stroke-width", 1);
      
      var nodeEnter = d3.select("svg").selectAll("g.node").data(nodes).enter()
      .append("g")
      .attr("class", "node")
      .call(force.drag())
      .on("click", fixNode)
      .each(function(d) {
          var c = geoPath.centroid(d);
          d.x = c[0];
          d.px = c[0];
          d.y = c[1];
          d.py = c[1];
      });
      
      //You need to start the force to calculate degree centrality
      forceTick();
      force.start();
      force.stop();
      sizeByDegree();
      
      function fixNode(d) {
        d3.select(this).select("circle").style("stroke-width", 4);
        d.fixed = true;
      }
      
      nodeEnter.append("circle")
      .attr("r", 1)
      .style("fill", "lightgray")
      .style("stroke", "black")
      .style("stroke-width", "1px");

nodeEnter.append("text")
      .style("text-anchor", "middle")
      .attr("y", 15)
//      The topojson data file I'm using doesn't have names...
//      .text(function(d) {return d.properites.name})

function forceTick() {
      d3.selectAll("line.link")
      .attr("x1", function (d) {return d.source.x})
      .attr("x2", function (d) {return d.target.x})
      .attr("y1", function (d) {return d.source.y})
      .attr("y2", function (d) {return d.target.y});
      
      d3.selectAll("g.node")
      .attr("transform", function (d) {return "translate("+d.x+","+d.y+")"})
      }

</script>
  </footer>
</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

Modified http://d3js.org/topojson.v1.min.js to a secure url

https://d3js.org/d3.v3.min.js

https://d3js.org/topojson.v1.min.js