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              <head>
  <link href="https://fonts.googleapis.com/css?family=Dosis" rel="stylesheet">
</head>
<body>
  <div class="text-center">
    <div id="container" class="text-center">
      <h1>Force Directed Graph of State Continuity</h1>
    </div>
    <div id="graph">
      <div id = "sprites"></div>
    </div>
  </div>
</body>
            
          
!
            
              body {
  background-color: #98BF2C;
}
#sprites {
 position: absolute;
}

#container {
  width: 450px;
  height: 130px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 10px;
  margin-bottom: 10px;
  padding-top: 15px;
  border-radius: 10px;
}

h1 {
  color: #51615A;
  font-family: 'Dosis', sans-serif;
}

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

.flag {
    display: inline-block;
    width: 32px;
    height: 32px;
    background: url('https://s7.postimg.org/75vfk37rf/flags.png') no-repeat;
  position:absolute;
}


.flag.flag-nz {
    background-position: -224px -320px;
}

.flag.flag-pa {
    background-position: -288px -320px;
}

.flag.flag-cd {
    background-position: -128px -64px;
}

.flag.flag-cn {
    background-position: -384px -64px;
}

.flag.flag-dk {
    background-position: -192px -96px;
}

.flag.flag-vu {
    background-position: -288px -448px;
}

.flag.flag-gy {
    background-position: -288px -160px;
}

.flag.flag-cl {
    background-position: -320px -64px;
}

.flag.flag-st {
    background-position: -320px -384px;
}

.flag.flag-no {
    background-position: -128px -320px;
}

.flag.flag-tw {
    background-position: -352px -416px;
}

.flag.flag-dm {
    background-position: -224px -96px;
}

.flag.flag-kz {
    background-position: -320px -224px;
}

.flag.flag-ec {
    background-position: -320px -96px;
}

.flag.flag-to {
    background-position: -224px -416px;
}

.flag.flag-tm {
    background-position: -160px -416px;
}

.flag.flag-bd {
    background-position: -64px -32px;
}

.flag.flag-ht {
    background-position: -416px -160px;
}

.flag.flag-je {
    background-position: -352px -192px;
}

.flag.flag-ie {
    background-position: -32px -192px;
}

.flag.flag-ck {
    background-position: -288px -64px;
}

.flag.flag-an {
    background-position: -224px 0;
}

.flag.flag-sd {
    background-position: 0 -384px;
}

.flag.flag-om {
    background-position: -256px -320px;
}

.flag.flag-sy {
    background-position: -384px -384px;
}

.flag.flag-kp {
    background-position: -192px -224px;
}

.flag.flag-ao {
    background-position: -256px 0;
}

.flag.flag-ws {
    background-position: -320px -448px;
}

.flag.flag-ky {
    background-position: -288px -224px;
}

.flag.flag-id {
    background-position: 0 -192px;
}

.flag.flag-tz {
    background-position: -384px -416px;
}

.flag.flag-dj {
    background-position: -160px -96px;
}

.flag.flag-vi {
    background-position: -224px -448px;
}

.flag.flag-za {
    background-position: -384px -448px;
}

.flag.flag-km {
    background-position: -128px -224px;
}

.flag.flag-bw {
    background-position: 0 -64px;
}

.flag.flag-ga {
    background-position: -224px -128px;
}

.flag.flag-az {
    background-position: -448px 0;
}

.flag.flag-ba {
    background-position: 0 -32px;
}

.flag.flag-nr {
    background-position: -192px -320px;
}

.flag.flag-gb {
    background-position: -256px -128px;
}

.flag.flag-li {
    background-position: -448px -224px;
}

.flag.flag-pk {
    background-position: -448px -320px;
}

.flag.flag-sc {
    background-position: -448px -352px;
}

.flag.flag-me {
    background-position: -320px -256px;
}

.flag.flag-pf {
    background-position: -352px -320px;
}

.flag.flag-cg {
    background-position: -192px -64px;
}

.flag.flag-tr {
    background-position: -256px -416px;
}

.flag.flag-na {
    background-position: -416px -288px;
}

.flag.flag-ge {
    background-position: -320px -128px;
}

.flag.flag-uz {
    background-position: -64px -448px;
}

.flag.flag-py {
    background-position: -160px -352px;
}

.flag.flag-cm {
    background-position: -352px -64px;
}

.flag.flag-sl {
    background-position: -160px -384px;
}

.flag.flag-gu {
    background-position: -224px -160px;
}

.flag.flag-ci {
    background-position: -256px -64px;
}

.flag.flag-gw {
    background-position: -256px -160px;
}

.flag.flag-hr {
    background-position: -384px -160px;
}

.flag.flag-si {
    background-position: -96px -384px;
}

.flag.flag-ps {
    background-position: -64px -352px;
}

.flag.flag-nc {
    background-position: -448px -288px;
}

.flag.flag-bz {
    background-position: -64px -64px;
}

.flag.flag-gh {
    background-position: -416px -128px;
}

.flag.flag-jm {
    background-position: -384px -192px;
}

.flag.flag-sb {
    background-position: -416px -352px;
}

.flag.flag-kn {
    background-position: -160px -224px;
}

.flag.flag-mk {
    background-position: -416px -256px;
}

.flag.flag-de {
    background-position: -128px -96px;
}

.flag.flag-tj {
    background-position: -96px -416px;
}

.flag.flag-sa {
    background-position: -384px -352px;
}

.flag.flag-mg {
    background-position: -352px -256px;
}

.flag.flag-eg {
    background-position: -384px -96px;
}

.flag.flag-lc {
    background-position: -416px -224px;
}

.flag.flag-mo {
    background-position: -64px -288px;
}

.flag.flag-sg {
    background-position: -64px -384px;
}

.flag.flag-at {
    background-position: -352px 0;
}

.flag.flag-ma {
    background-position: -224px -256px;
}

.flag.flag-am {
    background-position: -192px 0;
}

.flag.flag-gt {
    background-position: -192px -160px;
}

.flag.flag-ch {
    background-position: -224px -64px;
}

.flag.flag-ve {
    background-position: -160px -448px;
}

.flag.flag-ug {
    background-position: -448px -416px;
}

.flag.flag-im {
    background-position: -128px -192px;
}

.flag.flag-md {
    background-position: -288px -256px;
}

.flag.flag-ca {
    background-position: -96px -64px;
}

.flag.flag-sm {
    background-position: -192px -384px;
}

.flag.flag-be {
    background-position: -96px -32px;
}

.flag.flag-lb {
    background-position: -384px -224px;
}

.flag.flag-au {
    background-position: -384px 0;
}

.flag.flag-mc {
    background-position: -256px -256px;
}

.flag.flag-lv {
    background-position: -160px -256px;
}

.flag.flag-ml {
    background-position: -448px -256px;
}

.flag.flag-do {
    background-position: -256px -96px;
}

.flag.flag-cr {
    background-position: -448px -64px;
}

.flag.flag-jp {
    background-position: -448px -192px;
}

.flag.flag-ki {
    background-position: -96px -224px;
}

.flag.flag-co {
    background-position: -416px -64px;
}

.flag.flag-rw {
    background-position: -352px -352px;
}

.flag.flag-fj {
    background-position: -96px -128px;
}

.flag.flag-bs {
    background-position: -416px -32px;
}

.flag.flag-fi {
    background-position: -64px -128px;
}

.flag.flag-bh {
    background-position: -192px -32px;
}

.flag.flag-ni {
    background-position: -64px -320px;
}

.flag.flag-sn {
    background-position: -224px -384px;
}

.flag.flag-ar {
    background-position: -288px 0;
}

.flag.flag-ls {
    background-position: -64px -256px;
}

.flag.flag-vc {
    background-position: -128px -448px;
}

.flag.flag-is {
    background-position: -256px -192px;
}

.flag.flag-lt {
    background-position: -96px -256px;
}

.flag.flag-kw {
    background-position: -256px -224px;
}

.flag.flag-us {
    background-position: 0 -448px;
}

.flag.flag-kr {
    background-position: -224px -224px;
}

.flag.flag-iq {
    background-position: -192px -192px;
}

.flag.flag-my {
    background-position: -352px -288px;
}

.flag.flag-zm {
    background-position: -416px -448px;
}

.flag.flag-mv {
    background-position: -256px -288px;
}

.flag.flag-ad {
    background-position: 0 0;
}

.flag.flag-qa {
    background-position: -192px -352px;
}

.flag.flag-fr {
    background-position: -192px -128px;
}

.flag.flag-la {
    background-position: -352px -224px;
}

.flag.flag-mr {
    background-position: -128px -288px;
}

.flag.flag-td {
    background-position: 0 -416px;
}

.flag.flag-et {
    background-position: -32px -128px;
}

.flag.flag-np {
    background-position: -160px -320px;
}

.flag.flag-bi {
    background-position: -224px -32px;
}

.flag.flag-gr {
    background-position: -160px -160px;
}

.flag.flag-re {
    background-position: -224px -352px;
}

.flag.flag-bf {
    background-position: -128px -32px;
}

.flag.flag-bo {
    background-position: -352px -32px;
}

.flag.flag-lu {
    background-position: -128px -256px;
}

.flag.flag-cy {
    background-position: -64px -96px;
}

.flag.flag-tv {
    background-position: -320px -416px;
}

.flag.flag-ke {
    background-position: 0 -224px;
}

.flag.flag-dz {
    background-position: -288px -96px;
}

.flag.flag-ai {
    background-position: -128px 0;
}

.flag.flag-bt {
    background-position: -448px -32px;
}

.flag.flag-pl {
    background-position: 0 -352px;
}

.flag.flag-ua {
    background-position: -416px -416px;
}

.flag.flag-lr {
    background-position: -32px -256px;
}

.flag.flag-pw {
    background-position: -128px -352px;
}

.flag.flag-br {
    background-position: -384px -32px;
}

.flag.flag-gl {
    background-position: 0 -160px;
}

.flag.flag-gd {
    background-position: -288px -128px;
}

.flag.flag-mq {
    background-position: -96px -288px;
}

.flag.flag-pt {
    background-position: -96px -352px;
}

.flag.flag-vn {
    background-position: -256px -448px;
}

.flag.flag-es {
    background-position: 0 -128px;
}

.flag.flag-eh {
    background-position: -416px -96px;
}

.flag.flag-bn {
    background-position: -320px -32px;
}

.flag.flag-ro {
    background-position: -256px -352px;
}

.flag.flag-aw {
    background-position: -416px 0;
}

.flag.flag-uy {
    background-position: -32px -448px;
}

.flag.flag-gm {
    background-position: -32px -160px;
}

.flag.flag-ng {
    background-position: -32px -320px;
}

.flag.flag-tt {
    background-position: -288px -416px;
}

.flag.flag-bb {
    background-position: -32px -32px;
}

.flag.flag-hu {
    background-position: -448px -160px;
}

.flag.flag-er {
    background-position: -448px -96px;
}

.flag.flag-fo {
    background-position: -160px -128px;
}

.flag.flag-tn {
    background-position: -192px -416px;
}

.flag.flag-gp {
    background-position: -96px -160px;
}

.flag.flag-rs {
    background-position: -288px -352px;
}

.flag.flag-zw {
    background-position: -448px -448px;
}

.flag.flag-mh {
    background-position: -384px -256px;
}

.flag.flag-ae {
    background-position: -32px 0;
}

.flag.flag-mw {
    background-position: -288px -288px;
}

.flag.flag-pg {
    background-position: -384px -320px;
}

.flag.flag-ph {
    background-position: -416px -320px;
}

.flag.flag-cf {
    background-position: -160px -64px;
}

.flag.flag-ne {
    background-position: 0 -320px;
}

.flag.flag-al {
    background-position: -160px 0;
}

.flag.flag-af {
    background-position: -64px 0;
}

.flag.flag-gq {
    background-position: -128px -160px;
}

.flag.flag-mz {
    background-position: -384px -288px;
}

.flag.flag-hn {
    background-position: -352px -160px;
}

.flag.flag-mn {
    background-position: -32px -288px;
}

.flag.flag-gn {
    background-position: -64px -160px;
}

.flag.flag-so {
    background-position: -256px -384px;
}

.flag.flag-sk {
    background-position: -128px -384px;
}

.flag.flag-ms {
    background-position: -160px -288px;
}

.flag.flag-sz {
    background-position: -416px -384px;
}

.flag.flag-tg {
    background-position: -32px -416px;
}

.flag.flag-ye {
    background-position: -352px -448px;
}

.flag.flag-ir {
    background-position: -224px -192px;
}

.flag.flag-cz {
    background-position: -96px -96px;
}

.flag.flag-tl {
    background-position: -128px -416px;
}

.flag.flag-sr {
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}

.flag.flag-kg {
    background-position: -32px -224px;
}

.flag.flag-jo {
    background-position: -416px -192px;
}

.flag.flag-by {
    background-position: -32px -64px;
}

.flag.flag-gg {
    background-position: -384px -128px;
}

.flag.flag-as {
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}

.flag.flag-mm {
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}

.flag.flag-tc {
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}

.flag.flag-ee {
    background-position: -352px -96px;
}

.flag.flag-bj {
    background-position: -256px -32px;
}

.flag.flag-cv {
    background-position: -32px -96px;
}

.flag.flag-fm {
    background-position: -128px -128px;
}

.flag.flag-hk {
    background-position: -320px -160px;
}

.flag.flag-se {
    background-position: -32px -384px;
}

.flag.flag-lk {
    background-position: 0 -256px;
}

.flag.flag-pr {
    background-position: -32px -352px;
}

.flag.flag-cu {
    background-position: 0 -96px;
}

.flag.flag-it {
    background-position: -288px -192px;
}

.flag.flag-bm {
    background-position: -288px -32px;
}

.flag.flag-il {
    background-position: -64px -192px;
}

.flag.flag-bg {
    background-position: -160px -32px;
}

.flag.flag-in {
    background-position: -160px -192px;
}

.flag.flag-sv {
    background-position: -352px -384px;
}

.flag.flag-mu {
    background-position: -224px -288px;
}

.flag.flag-nl {
    background-position: -96px -320px;
}

.flag.flag-ag {
    background-position: -96px 0;
}

.flag.flag-pe {
    background-position: -320px -320px;
}

.flag.flag-ly {
    background-position: -192px -256px;
}

.flag.flag-kh {
    background-position: -64px -224px;
}

.flag.flag-ru {
    background-position: -320px -352px;
}

.flag.flag-vg {
    background-position: -192px -448px;
}

.flag.flag-gi {
    background-position: -448px -128px;
}

.flag.flag-mt {
    background-position: -192px -288px;
}

.flag.flag-mx {
    background-position: -320px -288px;
}

.flag.flag-va {
    background-position: -96px -448px;
}

.flag.flag-th {
    background-position: -64px -416px;
}

            
          
!
            
              /*jshint esversion: 6*/

const DATA =
  "https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json";

fetch(DATA).then((response) => response.json()).then(function(data) {
  
  let width = 800,
      height = 800;

   let svg = d3.select('#graph').append('svg').attr('width', width).attr('height', height);
  
  let nodes = data.nodes;
  let links = data.links;

  let tooltip = d3.select('body').append('div')
      .attr('id', "tooltip")
      .style('position', 'absolute')
      .style('background', '#7BC9A7')
      .style('padding', '5 15px')
      .style('border', '1px #7BC9A7 solid')
      .style('border-radius', '5px')
      .style('opacity', 0)
      .attr('font-family', 'Dosis')
      .style('color', 'black')
      .data(nodes);
  let simulation = d3.forceSimulation().nodes(nodes).force('links', d3.forceLink()).force("charge", d3.forceManyBody(-200).distanceMax(300))
    .force("center", d3.forceCenter(width / 2, height / 2));

  let link = svg.append('g').attr('class', 'links').selectAll('line').data(links).enter().append('line').style('stroke', 'black').style('stroke-width', 1);

  let node = svg.append('svg:g').attr('class', 'nodes').selectAll('img').data(nodes).enter().append('img').attr('class', function(d){return 'flag flag-' + d.code}).call(d3.drag()
    .on("start", dragstarted)
    .on("drag", dragged)
    .on("end", dragended));
  
  let sprites = d3.select('#sprites').selectAll('img').data(nodes).enter().append('img').attr('class', function(d){return 'flag flag-' + d.code}).call(d3.drag()
    .on("start", dragstarted)
    .on("drag", dragged)
    .on("end", dragended));
  
  simulation.nodes(nodes).on('tick', ticked);
  simulation.force('links').links(links);
  console.log(links);
  
  sprites.on('mouseover', function(d) {
      tooltip.html(d.country);
      tooltip.transition()
        .style('opacity', 1);

      tooltip.style('left', (d3.event.pageX) + 'px').style('top', (d3.event.pageY + 'px'));
      d3.select(this).style('opacity', 0.5);
    }).on('mouseout', function(d) {
      tooltip.transition()
        .style('opacity', 0);
      d3.select(this).style('opacity', 1);
    });

  function ticked() {
    link
      .attr("x1", function(d) {
        return d.source.x;
      })
      .attr("y1", function(d) {
        return d.source.y;
      })
      .attr("x2", function(d) {
        return d.target.x;
      })
      .attr("y2", function(d) {
        return d.target.y;
      });

    sprites
      .style("left", function(d) {
        return (d.x + 220) + 'px';
      })
      .style("top", function(d) {
        return d.y + 'px';
      });
  }

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

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

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