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HTML 

              
                <h1>If you can see this, something broke</h1>
<h2>World State Contiguity Graph</h2>
<div class="root"></div>
<button id="dispToggle">Toggle Basic Display</button>
<p>Background Image Credit: <a href="http://coolinfographics.com/blog/2016/6/3/the-global-air-transportation-network.html" target="_blank">http://coolinfographics.com/blog/2016/6/3/the-global-air-transportation-network.html</a></p>
!

CSS 

              
                body {
  background-color: #ecf0f1;
  // background-image: url("https://www.martingrandjean.ch/wp-content/uploads/2016/05/airports-map.png");
  // background-image: url("https://images.squarespace-cdn.com/content/v1/5bfc8dbab40b9d7dd9054f41/1546536945064-I274NMOL541FUC7PQW75/ke17ZwdGBToddI8pDm48kLAc1mZZ8w29KdMldU4BXwdZw-zPPgdn4jUwVcJE1ZvWQUxwkmyExglNqGp0IvTJZUJFbgE-7XRK3dMEBRBhUpxcdTlaiiQyCdZv_-k0-ue9n3jqPGJOHB8BX8cyPfQJLw-USXOwGRIEZxkJYp5BL3E/airports-map.png?format=750w");
  // background-image: url("https://cdn.pixabay.com/photo/2018/07/08/17/51/network-3524352_960_720.jpg");
  background-image: url("https://cdn.pixabay.com/photo/2020/02/15/14/33/network-4851119_960_720.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-attachment: fixed;
  background-size: cover;

}

h2 {
  color: white;
  text-align: center;
  font-family: 'Poiret One', 'Open sans', 'Josefin Sans', Arial
}

.links line {
  stroke: #999;
  stroke-opacity: 0.6;
}

.nodes circle {
  stroke: #fff;
  stroke-width: 1.5px;
}

.nodes rect {
  stroke: #fff;
  stroke-width: 1.5px;
}

#dispToggle {
  position: fixed;
  right: 0;
  bottom: 0;
}

p, a {
  color: #7e8c8d;
  position: fixed;
  bottom: 0;
  &:hover, &:visited, &:link {
    color: #7e8c8d;
    text-decoration: none;
  }
}
!

JS 

              
                $(document).ready(function () {

d3.selectAll('h1').style("display", "none");

var url = "https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json";

$.getJSON(url, function (json) {

var schema = {
  nodes: [
    {
      "country": "Canada",
      "code": "ca"
    }
  ],
  links: [
    {
      "target": 66,
      "source": 0
    }
  ]
}

var graphHeight   = Math.min(600, ($(window).height()-20)),
    graphWidth    = Math.min(960, ($(window).width()-20)),
    radius        = 5,
    simpleDisplay = false;

var canvas = d3.select('.root')
                .append('svg')
                .attr("width", graphWidth)
                .attr("height", graphHeight)
                .attr("transform", "translate(" + (($(window).width() - 0 - graphWidth)/2) + ", " + (($(window).height() - 100 - graphHeight)/2) + ")")
                .style("background-color", "rgba(255,255,255,0.9)")
                .style("border", "1px solid black");

var simulation = d3.forceSimulation()
                    .nodes(json.nodes);

var customManyBody = d3.forceManyBody()
                        .strength(-50)
                        .distanceMax(130);

var customForceCenter = d3.forceCenter(graphWidth/2, graphHeight/2)
                          //.strength(1);

var link_force = d3.forceLink(json.links)
                    .strength(1.3)
                    // .id(function (d) { return d.country; });

var colide_force = d3.forceCollide(radius)
                      .strength(4);

simulation.force("charge_force", customManyBody)
          .force("center_force", customForceCenter) //d3.forceCenter(graphWidth/2, graphHeight/2)
          .force("links", link_force)
          .force("colide", colide_force);


var link = canvas.append('g')
                  .attr("class", "links")
                  .selectAll('line')
                  .data(json.links)
                  .enter()
                  .append('line')
                  .attr("stroke-width", 2);

var node = canvas.append('g')
                  .attr("class", "nodes")
                  .selectAll('image')
                  .data(json.nodes)
                  .enter()
                  // .append('img')
                  // .attr("class", function (d) {
                  //   return "flag flag-" + d.code
                  // })

                  // .append('image')
                  // .attr("href", "https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png")
                  // .attr("transform", "translate(" + -radius + ", " + -radius + ")")
                  // .attr("width", radius*2)
                  // .attr("height", radius*2);

                  .append('image')
                  .attr("href", function (d) {
                    return "https://www.geonames.org/flags/x/" + d.code + ".gif";
                  })
                  .attr("class", "flag flag-cz")
                  .attr("transform", "translate(" + -radius + ", " + -radius + ")")
                  .attr("width", radius*2)
                  .attr("height", radius*2)

                  .on("mouseover", function (d) {
                    var xPos = d3.mouse(this)[0] + 10;
                    var yPos = d3.mouse(this)[1] - 40;
                    toolTip.style("display", null)
                            .attr("transform", "translate(" + xPos + ", " + yPos + ")")
                    toolTipText.text(d.country)
                    toolTipBack.attr("width", function () { return d.country.length * 8 })
                  })
                  .on("mousemove", function (d) {
                    var xPos = d3.mouse(this)[0] + 10;
                    var yPos = d3.mouse(this)[1] - 40;
                    toolTip.attr("transform", "translate(" + xPos + ", " + yPos + ")")
                  })
                  .on("mouseout", function() {
                    toolTip.style("display", "none")
                  })


                  // .append('rect')
                  // .attr("transform", "translate(" + -radius + ", " + -radius + ")")
                  // .attr("width", radius*2)
                  // .attr("height", radius*2)
                  // .attr("fill", "red");

var toolTip = canvas.append('g')
                    .style("display", "none")

var toolTipBack = toolTip.append('rect')
                         .attr("width", "100")
                         .attr("height", "18")
                         .attr("fill", "white");

var toolTipText = toolTip.append("text")
                          .text("placeholder")
                          .attr("x", "4")
                          .attr("y", "14")


function tickActions() {
  node.attr("x", function(d) { return d.x = Math.max(radius, (Math.min(graphWidth-(radius*2), d.x))); })
      .attr("y", function(d) { return d.y = Math.max(radius, (Math.min(graphHeight-radius, d.y))); });

  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 })
}

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

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

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

var drag_handler = d3.drag()
                      .on("start", drag_start)
                      .on("drag", drag_drag)
                      .on("end", drag_end);

drag_handler(node);

simulation.on("tick", tickActions);


var testFlag = canvas.append('img')
                      //.attr("src", "blank.gif")
                      .attr("class", "flag flag-cz")
                      .attr("alt", "Czech Republic")
                      //.style("display", "block")
                      .attr("x", "30")
                      .attr("y", "30");
      //redners but is invisible whatup w that


// var iestImg = canvas//.append('rect')
// // .attr("width", "200")
// // .attr("height", "200")
// // .attr("fill", "none")
//                     .append('image')
//                     .attr("href", "https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png")
//                     .attr("width", "200")
//                     .attr("height", "200")
//                     .attr("x", "0")
//                     .attr("y", "0");


function toggleDisplay() {
  switch(simpleDisplay) {
    case false:
    d3.select('body')
      .style("background-image", 'none')
      .style("background-color", "white");
    canvas.style("background-color", "white")
    d3.selectAll('h2')
      .style("color", "black")
      .style("font-family", "arial")
    simpleDisplay = true;
    break;
    case true:
    d3.select('body')
      .style("background-image", null)
      .style("background-color", "none");
    canvas.style("background-color", "rgba(255,255,255,0.9)");
    d3.selectAll('h2')
      .style("color", null)
      .style("font-family", null)
    simpleDisplay = false;
    break;

  }
}

$('#dispToggle').on("click", function () {
  toggleDisplay();
})



});



});
!
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