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HTML

              
                <h1>Nations Sharing Borders (Contiguity)</h1>
<div class="container">
	<div id="flag-icons"></div>
</div>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css?family=Open+Sans:400,400italic");

body {
  font-family: 'Open Sans';
}

.container {
  padding-top: 20px;
}

#flag-icons {
  position: absolute;
}

.tooltip {
  text-align: center;
  background-color: #333;
  line-height: 1.3em;
  color: #fff;
  width: 130px;
  opacity: 0.8;
  font-size: 12px;
  padding: 5px 6px;
  border-radius: 6px;
  border: 1px solid #ff0000;
}

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

.flag {
    position: absolute;
    width: 32px;
    height: 32px;
    background-image: url("https://bit.ly/2l6GbZI");
	background-repeat: no-repeat;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

.flag.flag-no {
    background-position: 0 -320px;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

JS

              
                /* This is version 2 of this Free Code Camp challenge, as the original camper hot news data feed was discontinued. */

d3.json('https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json',
   function(error, json) {
    if (error) return console.warn(error);
      var dataset = json;
      
    makeForceLayout(dataset);
});
  
function makeForceLayout(dataset) {
  // establish the SVG canvas area
  var width = 800;
  var height = 800;
  var flagW = 32;
  var flagH = 32;
      
  // set force SVG
  var container = d3.select('.container');

  var svg = container.append("svg")
              .attr("width", width)
              .attr("height", height)
              .append("g");

  // initialize force layout using nodes and links 
  var force = d3.layout.force()
                .nodes(dataset.nodes) 
                .links(dataset.links)
                .gravity(0.2) 
                .charge([-120])     
                .size([width, height])
                .start();
	
  // add links
  var links = svg.selectAll("line")
                 .data(dataset.links)
                 .enter()
                 .append("line")
                 .style("stroke", "#ff0000")
                 .style("stroke-width", 1);
  
  // add images               
  var nodes = container
                .select('#flag-icons')
                .selectAll("img")
                .data(dataset.nodes)
                .enter()
                .append("img")
                .attr("class", function(d) {
                  return 'flag flag-' + d.code;
                })
								.attr("title", function(d) {
									return d.country;
								})
                .call(force.drag);
                  
  force.on("tick", function(e) {
    nodes.style('left', function(d){
      return (d.x - 16) + 'px';
    })
    .style('top', function(d) {
      return (d.y - 16) + 'px';
    });

    links.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;
    });
  });
}
              
            
!
999px

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