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HTML

            
              

<div id="chart">
  <h1>National Contiguity - Force Directed Graph</h1>
<div id="notes">
  Code by <a href="http://lukewalker.org" target="_blank">Luke Walker</a>, as a solution for <a href="https://www.freecodecamp.com/challenges/show-national-contiguity-with-a-force-directed-graph" target="_blank">this Free Code Camp project</a>. I got a lot of help from <a href="http://jsdatav.is/visuals.html?id=26648f33f3bc9725604a" target="_blank">this</a> series of tutorials.
</div>
</div>
!

CSS

            
              body {
  font: 14px sans-serif;
  padding: 20px;
  background: #333;
}

#notes {
  position: absolute;
  bottom: 10px;
  width: 100%;
  text-align: center;
}

#flags-img {
  display: block;
  position: fixed;
  bottom: 0;
  left: 0
  z-index: 100;
}
#chart {
  background: #ccc;
  width: 900px;
  height: 800px;
  box-shadow: 10px 10px 40px -2px rgba(0,0,0,0.62);
  padding: 20px 0;
  margin: 20px auto;
  position: relative;
}

h1 {
  position: absolute;
  font-size: 30px;
  font-family: Courier, monospace;
  top: 10px;
  left: 10px;
  width: 100%;
  text-align: center;
  
}

.countries {
  position: absolute;
}

.link {
  stroke: #777;
  stroke-width: 1px;
}

.tooltip {
  position: absolute;
  text-align: center;
  width: 150px;
  height: auto;
  padding: 10px 5px;
  font: 16px sans-serif;
  line-height: 1.4;
  font-weight: 100;
  background: #000;
  border: 0px;
  border-radius: 8px;
  display: none;
  opacity: 0.9;
  color: white; 
}

/*!
 * Generated with CSS Flag Sprite generator (https://www.flag-sprites.com/)
 */

.flag {
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    height: 15px;
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!

JS

            
              (function() {
 var dataUrl = 'https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json';

  var tooltip = d3.select('body').append('div').attr('class', 'tooltip'),
        showTooltip = function(d) {
          tooltip.html('<div>' + d.country + '</div>')
            .style('left', (d3.event.pageX + 10) + 'px')
            .style('top', (d3.event.pageY + 10) + 'px')
            .style('display', 'block');
        },
        hideTooltip = function(d) {
          tooltip.style('display', 'none');
        };

  d3.json(dataUrl, function(e, data) {
    if (e) throw e;
    buildChart(data);
  });

  function buildChart(graph) {

    var margin = {
      top: 5,
      right: 5,
      bottom: 5,
      left: 5
    };

    var width = 900 - margin.right - margin.left,
      height = 780 - margin.top - margin.bottom;


    var countries = d3.select('#chart')
      .append('div')
      .attr('class', 'countries');

    var svg = d3.select('#chart').append('svg')
      .attr('width', width + margin.right + margin.left)
      .attr('height', height + margin.top + margin.bottom)
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    var nodes = graph.nodes,
        links = graph.links;

    var force = d3.layout.force()
      .size([width, height])
      .nodes(nodes)
      .links(links)
      .linkDistance(55)
      .charge([-100])
      .start();

    var borders = svg.selectAll('.link')
      .data(links)
      .enter().append('line')
      .attr('class', 'link')

    var node = countries.selectAll('.flag')
      .data(nodes)
      .enter().append('img')
      .attr('class', function(d) {
        return 'flag flag-' + d.code;
      })
      .call(force.drag)
      .on('mouseover', showTooltip)
      .on('mouseout', hideTooltip);


    force.on('tick', function() {
      borders
        .attr('x1', function(d) { return d.source.x + margin.left; })
        .attr('y1', function(d) { return d.source.y + margin.top; })
        .attr('x2', function(d) { return d.target.x + margin.left; })
        .attr('y2', function(d) { return d.target.y + margin.top; });

      node
        .style('left', function(d) {
          return d.x + margin.left + 'px'; })
        .style('top', function(d) { return d.y + margin.top + 'px'; });
    });

  }
  
})();
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