The Wealth & Health of Nations

This is a recreation in D3 of Gapminder’s Wealth & Health of Nations, made famous by Hans Rosling’s memorable 2006 TED talk. It shows the dynamic fluctuation in per-capita income (x), life expectancy (y) and population (radius) of 180 nations over the last 209 years. Nations are colored by geographic region; mouseover to read their names.

Original credit to Mike Bostock. I added the tooltip labels.

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>The Wealth & Health of Nations</title>
<style>
#chart {
    font-family: "Helvetica Neue";
  	margin-left: -20px;
  	height: 506px;
}

.dot { stroke: #000; }

.axis path, .axis line {
  	fill: none;
  	stroke: #000;
  	shape-rendering: crispEdges;
}

.year.label {
  	font: 500 196px "Helvetica Neue";
  	fill: #ddd;
}

.overlay {
  	fill: none;
  	pointer-events: all;
  	cursor: ew-resize;
}
  .d3-tip {
  font-family: "Helvetica Neue";
  line-height: 1;
  font-weight: bold;
  padding: 12px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 2px;
  pointer-events: none;
}

/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: rgba(0, 0, 0, 0.8);
  position: absolute;
  pointer-events: none;
}

/* Northward tooltips */
.d3-tip.n:after {
  content: "\25BC";
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
  text-align: center;
}

/* Eastward tooltips */
.d3-tip.e:after {
  content: "\25C0";
  margin: -4px 0 0 0;
  top: 50%;
  left: -8px;
}

/* Southward tooltips */
.d3-tip.s:after {
  content: "\25B2";
  margin: 0 0 1px 0;
  top: -8px;
  left: 0;
  text-align: center;
}

/* Westward tooltips */
.d3-tip.w:after {
  content: "\25B6";
  margin: -4px 0 0 -1px;
  top: 50%;
  left: 100%;
}
</style>

// Various scales. These domains make assumptions of data, naturally.
var xScale = d3.scale.log().domain([300, 1e5]).range([0, width]),
    yScale = d3.scale.linear().domain([10, 85]).range([height, 0]),
    radiusScale = d3.scale.sqrt().domain([0, 5e8]).range([0, 40]),
    colorScale = d3.scale.category10();

// The x & y axes.
var xAxis = d3.svg.axis().scale(xScale).orient("bottom").ticks(12, d3.format(",d"));
var yAxis = d3.svg.axis().scale(yScale).orient("left");

// 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 + ")");

// 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 label.
svg.append("text")
    .attr("class", "x label")
    .attr("text-anchor", "end")
    .attr("x", width)
    .attr("y", height - 6)
    .text("income per capita, inflation-adjusted (dollars)");

// Add a y-axis label.
svg.append("text")
    .attr("class", "y label")
    .attr("text-anchor", "end")
    .attr("y", 6)
    .attr("dy", ".75em")
    .attr("transform", "rotate(-90)")
    .text("life expectancy (years)");

// Add the year label; the value is set on transition.
var label = svg.append("text")
    .attr("class", "year label")
    .attr("text-anchor", "end")
    .attr("y", height - 24)
    .attr("x", width)
    .text(1800);
 var format = d3.format(".2s");
var tip = d3.tip()
  .attr('class', 'd3-tip')
  .direction('s')
  .html(function(d) {
    return "<p><strong>" + d.name + "</strong></p><p><strong>Population: </strong>" + format(d.population) + "</p>";
  })
// Various accessors that specify the four dimensions of data to visualize.
function x(d) { return d.income; }
function y(d) { return d.lifeExpectancy; }
function radius(d) { return d.population; }
function color(d) { return d.region; }
function key(d) { return d.name; }

// Load the data.
d3.json("nations.json", function(nations) {
  	// A bisector since many nation's data is sparsely-defined.
  	var bisect = d3.bisector(function(d) { return d[0]; });

// Add a dot per nation. Initialize the data at 1800, and set the colors.
  	var dot = svg.append("g")
    		.call(tip)
    		.attr("class", "dots")
    	.selectAll(".dot")
    		.data(interpolateData(1800))
    	.enter().append("circle")
    		.on('mouseover', tip.show)
     		.on('mouseout', tip.hide)
    		.attr("class", function (d) { return "dot " + d.name; })
      	.style("fill", function(d) { return colorScale(color(d)); })
      	.call(position)
      	.sort(order);
  
  	// Add an overlay for the year label.
  	var box = label.node().getBBox();
  
  	var overlay = svg.append("rect")
    		.attr("class", "overlay")
    		.attr("x", box.x)
    		.attr("y", box.y)
    		.attr("width", box.width)
    		.attr("height", box.height)
    		.on("mouseover", enableInteraction);
  
  	// Start a transition that interpolates the data based on year.
  	svg.transition()
      	.duration(15000)
      	.ease("linear")
      	.tween("year", tweenYear)
      	.each("end", enableInteraction);
  
  	// Positions the dots based on data.
  	function position(dot) {
      	dot.attr("cx", function(d) { return xScale(x(d)); })
          	.attr("cy", function(d) { return yScale(y(d)); })
          	.attr("r", function(d) { return radiusScale(radius(d)); });
    		}
  
  	// Defines a sort order so that the smallest dots are drawn on top.
  	function order(a, b) { return radius(b) - radius(a); }
  
  	// After the transition finishes, you can mouseover to change the year.
  	function enableInteraction() {
      	var yearScale = d3.scale.linear()
        	.domain([1800, 2009])
        	.range([box.x + 10, box.x + box.width - 10])
        	.clamp(true);

// Cancel the current transition, if any.
      	svg.transition().duration(0);

overlay
          	.on("mouseover", mouseover)
          	.on("mouseout", mouseout)
          	.on("mousemove", mousemove)
          	.on("touchmove", mousemove);

// Tweens the entire chart by first tweening the year, and then the data.
  	// For the interpolated data, the dots and label are redrawn.
  	function tweenYear() {
      	var year = d3.interpolateNumber(1800, 2009);
      	return function(t) { displayYear(year(t)); };
    }

// Updates the display to show the specified year.
  	function displayYear(year) {
      	console.log(dot.data(interpolateData(year), key).call(position).sort(order))
        dot.data(interpolateData(year), key).call(position).sort(order);
      	label.text(Math.round(year));
    }

// Interpolates the dataset for the given (fractional) year.
  	function interpolateData(year) {
      	return nations.map(function(d) {
          	return {
              	name: d.name,
              	region: d.region,
              	income: interpolateValues(d.income, year),
              	population: interpolateValues(d.population, year),
              	lifeExpectancy: interpolateValues(d.lifeExpectancy, year)
            };
        });
    }

// Finds (and possibly interpolates) the value for the specified year.
  	function interpolateValues(values, year) {
      	var i = bisect.left(values, year, 0, values.length - 1),
            a = values[i];
      	if (i > 0) {
          	var b = values[i - 1],
                t = (year - a[0]) / (b[0] - a[0]);
          	return a[1] * (1 - t) + b[1] * t;
        }
      return a[1];
    }
});
</script>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js

https://cdnjs.cloudflare.com/ajax/libs/d3-tip/0.6.3/d3-tip.min.js