Less 5 MOOC

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Renewable energy consumption and energy dependence rate in the European Union</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
	<style type="text/css">
			
			body {
				background-color: white;
				font-family: Helvetica, Arial, sans-serif;
			}

h1 {
				font-size: 24px;
				margin: 0;
			}

p {
				font-size: 14px;
				margin: 10px 0 0 0;
			}

svg {
				background-color: white;
			}

circle:hover {
				opacity: 0.6;
			}
			
			.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}
			.y.axis path,
			.y.axis line {
				opacity: 0;
			}

</style>
	</head>
	<body>

<h1>Where does the EU energy comes from?</h1>

<p>Renewable energy consumption and energy dependence rate per EU countries</p>
		<p>In percentage, for 2013. Source: <a href="https://ec.europa.eu/eurostat/home">Eurostat</a></p>

var w = 750;
			var h = 500;
			var padding = [ 30, 30, 50, 50 ];  //Top, right, bottom, left

var xScale = d3.scale.linear()
								.range([ padding[3], w - padding[1] - padding[3] ]);
			
			var yScale = d3.scale.linear()
								.range([ padding[0], h - padding[2] ]);

var xAxis = d3.svg.axis()
							.scale(xScale)
							.orient("bottom")
							.ticks(15)
							.tickFormat(function(d) {
								return d + "%";
							});

var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left")
							.ticks(10)
							.tickFormat(function(d) {
								return d + "%";
							});

var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

d3.csv("Lesson3GreenEnergy.csv", function(data) {

xScale.domain([ 
					d3.min(data, function(d) {
						return +d.Energy_dependance;
					}), 
					d3.max(data, function(d) {
						return +d.Energy_dependance;
					})
				]);

yScale.domain([
					d3.max(data, function(d) {
						return +d.Renewable_energy_consumption;
					}),
					d3.min(data, function(d) {
						return +d.Renewable_energy_consumption;
					})
				]);

var circles = svg.selectAll("circle")
								.data(data)
								.enter()
								.append("circle");

circles.attr("cx", function(d) {
						return xScale(d.Energy_dependance);
					})
					.attr("cy", function(d) {
						return yScale(d.Renewable_energy_consumption);
					})
					.attr("r", 0.1)
					.attr("fill", "green")
					.append("title")
					.text(function(d) {
						return d.Country + " consumes " + d.Renewable_energy_consumption + "% of renewable energy, and its energy dependence rate is " + d.Energy_dependance + "%";
					});

circles.sort(function(a, b) {
						return d3.ascending(+a.Energy_dependance, +b.Energy_dependance);
					})
					.transition()
					.delay(function(d, i) {
						return i * 20;
					})
					.duration(1500)
					.attr("r", 5);

svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(0," + (h - padding[2] + 10) + ")")
					.call(xAxis);

svg.append("g")
					.attr("class", "y axis")
					.attr("transform", "translate(" + (padding[3] - 10) + ",0)")
					.call(yAxis);

});

</script>

</body>
</html>

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

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