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National Contiguity - D3 Force Directed Graph

A Pen By Luke Walker

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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

            
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/*!
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!

JS

            
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  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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