JSFiddle - React, Tailwind, and code Playground

by andrewarnier

HTML

<svg width="960" height="960"></svg>
<script src="//d3js.org/d3.v4.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>

CSS

.stroke {
    fill: none;
    stroke: #000;
    stroke-width: 3px;
  }
  
  .fill {
    fill: #fff;
  }
  
  .graticule {
    fill: none;
    stroke: #777;
    stroke-width: 0.5px;
    stroke-opacity: 0.5;
  }
  
  .land {
    fill: #222;
  }
  
  .boundary {
    fill: none;
    stroke: #fff;
    stroke-width: 0.5px;
  }

JavaScript

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

  var projection = d3.geoMercator()
    .scale((width - 3) / (2 * Math.PI))
    .translate([width / 2, height / 2]);

  var path = d3.geoPath()
    .projection(projection);

  var graticule = d3.geoGraticule();

  svg.append("defs").append("path")
    .datum({
      type: "Sphere"
    })
    .attr("id", "sphere")
    .attr("d", path);

  svg.append("use")
    .attr("class", "stroke")
    .attr("xlink:href", "#sphere");

  svg.append("use")
    .attr("class", "fill")
    .attr("xlink:href", "#sphere");

  svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);

  d3.json("https://rawgit.com/d3/d3-geo/master/test/data/world-50m.json", function(error, world) {
    if (error) throw error;

    svg.insert("path", ".graticule")
      .datum(topojson.feature(world, world.objects.land))
      .attr("class", "land")
      .attr("d", path);

    svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) {
        return a !== b;
      }))
      .attr("class", "boundary")
      .attr("d", path);


    var coordinates = [
      projection([-74, 40]), // new york
      projection([37, 55]) // moscow
    ];

    var line = svg.append("path")
      .datum(coordinates)
      .attr("d", function(c) {
        var d = {
          source: c[0],
          target: c[1]
        };
        var dx = d.target[0] - d.source[0],
          dy = d.target[1] - d.source[1],
          dr = Math.sqrt(dx * dx + dy * dy);
        return "M" + d.source[0] + "," + d.source[1] + "A" + dr + "," + dr +
          " 0 0,1 " + d.target[0] + "," + d.target[1];
      })
      .style("stroke", "steelblue")
      .style("stroke-width", 5)
      .style("fill", "none")
      .transition()
      .duration(5000)
      .attrTween("stroke-dasharray", function() {
        var len = this.getTotalLength();
        return function(t) {
     ...