Topojson Import into Force-Directed

Just a simple reminder that a topology is a network. This takes a topojson world map of countries and uses topojson.neighbors to populate an edge list and topojson.feature to populate a node list and bind that to a traditional force-directed network.

<html xmlns="https://www.w3.org/1999/xhtml">
<head>
  <title>topojson import into force directed network</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();">

function forceDirected() {
    d3.json("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);
      
      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})

force.start();

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+")"})
      }

function sizeByDegree() {
      force.stop();
      d3.selectAll("circle")
      .attr("r", function(d) {return d.weight * .2})
      }
   d3.select("#controls").append("button").on("click", sizeByDegree).html("Degree Size");
   
   
    }
  }

</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