My tribute to Hans Rosling

Based on Gapminder Subset, data and design by Gapminder, of course.

Not your cleanest code.

<!DOCTYPE html>
<head>
<meta charset="utf-8">
<link href="https://fonts.googleapis.com/css?family=Quicksand" rel="stylesheet">
<title>My tribute to Hans Rosling</title>
<style>
body{
  font-family: 'Quicksand', sans-serif;
}

text {
  font-family: 'Quicksand', sans-serif;
  font-size: 12px;
}
  
text.seventeen {
  font-size: 300px;
  fill: #e1e1e1;
  letter-spacing: 30px;
}
 
text.fourtyseven {
  font-size: 32px;
  letter-spacing: 10px;
  fill: #e1e1e1;
}
  
text.rosling {
  font-size: 140px;
  fill: #000000;
}
  
text.thanks {
  font-size: 50px;
  fill: #000000;
}

.dot {
  stroke: #000;
  opacity: 1;
}
  
.dot2 {
  opacity: 1;
}

.axis path, .axis line {
  fill: none;
  stroke: rgb(153, 153, 153);
  shape-rendering: crispEdges;
}

.y.label, .x.label {
    font-size: 20px;
  }

g.tick text, .label {
  fill: rgb(153, 153, 153);
}
  
button {
  border-radius: 40px;
  font-size: 1em;
  width: 40px;
  height: 40px;
  background: #fff;
  display: block;
  border: 0;
  padding: 0;
  margin: 5px;
  cursor: pointer;
}

</style>
</head>
<body>
  <button id="animate">
  <svg class="vzb-icon vzb-icon-play" viewBox="3 3 42 42" xmlns="https://www.w3.org/2000/svg">
    <path xmlns="https://www.w3.org/2000/svg" d="M24 4C12.95 4 4 12.95 4 24s8.95 20 20 20 20-8.95 20-20S35.05 4 24 4zm-4 29V15l12 9-12 9z"></path>
  </svg>
</button>
<div id="chart"></div>

// Chart dimensions.
var margin = {top: 19.5, right: 32, bottom: 40, left: 32},
    width = 960 - margin.right - margin.left,
    height = 600 - margin.top - margin.bottom;
var colorscheme = ["#ff5872", "#7feb00", "#00d5e9", "#ffe700"];

// Create the SVG container and set the origin.
var svg = d3.select("#chart").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// Various scales. These domains make assumptions of data
var xScale = d3.scaleLog().domain([400, 82000]).range([0, width]),
    yScale = d3.scaleLinear().domain([20, 85]).range([height, 0]),
    radiusScale = d3.scaleSqrt().domain([0, 5e8]).range([3, 40]),
    colorScale = d3.scaleOrdinal(colorscheme);

// The x & y axes
var xAxis = d3.axisBottom(xScale)
  .tickValues([500, 1000, 2000, 4000, 8000, 16000, 32000, 64000, 128000])
  .tickFormat(function (d) {
      if ((d / 10000) >= 1) {
        d = d / 1000 + "k";
      }
      return d;
    })
  .tickSize(0),
    yAxis = d3.axisLeft(yScale)
    .tickValues([20, 30, 40, 50, 60, 70, 80])
    .tickSize(0);

// Add the x-axis
svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

// Add the y-axis
svg.append("g")
    .attr("class", "y axis")
    .call(yAxis);

// Add an x-axis title
svg.append("text")
    .attr("class", "x label")
    .attr("text-anchor", "end")
    .attr("x", width)
    .attr("y", height + 32)
    .text("Income per person, GDP/capita in $/year adjusted for inflation & prices");

// Add a y-axis title
svg.append("text")
    .attr("class", "y label")
    .attr("y", -20)
    .attr("x", -22)
    .attr("dy", ".75em")
    .text("Life expectancy (years)");
  
svg.append("text")
    .attr("class", "rosling")
    .attr("text-anchor", "middle")
    .attr("y", 3*height/4 - 100)
    .attr("x", width/2)
    .text("Hans Rosling")
    .style("opacity", 0);

svg.append("text")
    .attr("class", "yearlabel seventeen")
    .attr("text-anchor", "middle")
    .attr("y", 3*height/4 - 30)
    .attr("x", width/2)
    .text("2017");
  
svg.append("text")
    .attr("class", "yearlabel fourtyseven")
    .attr("text-anchor", "middle")
    .attr("y", 3*height/4 - 30)
    .attr("x", 3*width/4 - 5)
    .text("1948 - ")
    .style("opacity", 0);
  
svg.append("text")
    .attr("class", "thanks")
    .attr("text-anchor", "middle")
    .attr("y", height - 70)
    .attr("x", width/2)
    .text("Thank you, professor. Rest in peace.")
    .style("opacity", 0);
  
var dropPath = 'M 243.44676,222.01677 C 243.44676,288.9638 189.17548,343.23508 122.22845,343.23508 C 55.281426,343.23508 1.0101458,288.9638 1.0101458,222.01677 C 1.0101458,155.06975 40.150976,142.95572 122.22845,0.79337431 C 203.60619,141.74374 243.44676,155.06975 243.44676,222.01677 z';
  
d3.select("#animate").on("click", function(){
  d3.select(".seventeen")
    .transition().delay(4000).duration(6000)
    .attr("x", 3*width/4 + 135)
    .style("font-size", "32px")
    .style("letter-spacing", "10px");
  d3.select(".fourtyseven")
    .transition().delay(10000).duration(2000)
    .style("opacity", 1);
  
  d3.select(".rosling")
    .transition().delay(10000).duration(2000)
    .style("opacity", 1);
  d3.select(".thanks")
    .transition().delay(12000).duration(2000)
    .style("opacity", 1);
  
  d3.selectAll(".dot")
    .transition()
    .delay(function(d,i) { return i*100; })
    .style("opacity", 0);
  
  d3.selectAll(".dot2").transition().duration(4000)
    .delay(function(d,i) { return i*100; })
    .attr("cy", function() {return Math.random()*100; })
    .style("opacity", 0.1);
  
  d3.selectAll(".drop")
    .transition().duration(4000).delay(function(d,i) { return i*100; })
    .style("opacity", 1)
    .attr("transform", function(d, i){
        return 'translate('+[xScale(+d.gdp) - radiusScale(+d.pop)*1.2, height+50] + ') scale('+radiusScale(+d.pop)*0.01+','+ radiusScale(+d.pop)*0.01+')';})
});

// Load the data
  
d3.queue()
  .defer(d3.json, 'datapoints.json')
  .defer(d3.json, 'geo.json')
  .await(function(error, nations, geo) {
  
  var nationsdata = [];
  nations.rows.forEach(function(d) {
    var obj = {};
    obj.countrycode = d[0];
    var geodata = geo.rows.filter(function(ccode){
      return ccode[0] == d[0];
    });
    obj.name = geodata[0][1];
    obj.region = geodata[0][2];
    obj.lifeexp = d[3];
    obj.gdp = d[2];
    obj.pop = d[4];
    nationsdata.push(obj);
    return nationsdata;
  });
  
  var dotGroup2 = svg.append("g");
  var dotGroup = svg.append("g");
   
  var dots = dotGroup.selectAll("circle")
      .data(nationsdata.sort(order));
  var dots2 = dotGroup2.selectAll("circle")
      .data(nationsdata.sort(order));
      
  dots2  	  
      .enter().append("circle")
      .attr("class", "dot2")
      .attr("id", function(d){ return d.countrycode; })
      .attr("cx", function(d) { return xScale(+d.gdp); })
      .attr("cy", function(d) { return yScale(+d.lifeexp); })
      .attr("r", function(d) { return radiusScale(+d.pop); })
      .style("fill", function(d) { return colorScale(d.region); })
  	  .append("title");
  
  dots  	  
      .enter().append("circle")
      .attr("class", "dot")
      .attr("id", function(d){ return d.countrycode; })
      .attr("cx", function(d) { return xScale(+d.gdp); })
      .attr("cy", function(d) { return yScale(+d.lifeexp); })
      .attr("r", function(d) { return radiusScale(+d.pop); })
      .style("fill", function(d) { return colorScale(d.region); })
  	  .append("title");
  
  svg.selectAll('g.drop').data(nationsdata.sort(order))
      .enter().append('g')
      .attr("class", "drop")
      .attr("transform", function(d, i){
        return 'translate('+[xScale(+d.gdp) - radiusScale(+d.pop)*1.2, yScale(+d.lifeexp)- radiusScale(+d.pop)*1.2]+') scale('+radiusScale(+d.pop)*0.01+','+ radiusScale(+d.pop)*0.01+')';
      })
      .style("opacity", 0)
      .append('path').attr("d", dropPath)
      .style("fill", "none")
      .style("stroke", "#000000")
      .style("stroke-width", 10);
  
  // Defines a sort order so that the smallest dots are drawn on top.
  function order(a, b) {
    return +b.pop - +a.pop;
  }
});

</script>
</body>

Modified http://d3js.org/d3.v4.min.js to a secure url

https://d3js.org/d3.v4.min.js