Module 5, exercice 5 (Joachim)

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Cleaning Up</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: 40px;
				margin: 0;
			}

p {
				font-size: 13px;
				margin: 20px 20 0 0;
			}

svg {
				background-color: white;
			}

circle:hover {
				fill: steelblue;
			}
			
			.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 13px;
			}

.y.axis path,
			.y.axis line {
				opacity: 20;
			}

</style>
	</head>
	<body>

<h1> Top 20 countries by forest </h1>
		<p> % of the area cover by woodland and total area of forest in km<SUP>2</SUP> </p>

// set width and height of viz, plus padding
			var w = 700;
			var h = 600;
			var padding = [ 10, 50, 20, 50 ];  //Top, right, bottom, left

// make width scale, set as linear (to hold numbers). Subtract padding
			var xScale = d3.scale.linear()
								.range([ padding[3], w - padding[1] ]);

// make height scale, set as ordinal (eg categories). Subtract padding.			
			var yScale = d3.scale.linear()
								.range([ padding[0], h - padding[2] ]);

// create horizontal axis and place it on the bottom
			var xAxis = d3.svg.axis()
							.scale(xScale)
							.orient("bottom")
							.ticks(4)
							.tickFormat(function(d) {
								return d + " km2";
							});

// create veritcal axis and place it on the left
			var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left")
							.tickFormat(function(d) {
								return d + " %";
							});

// create a holder for the SVG in the body, give it the width and height set earlier
			var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

// call the data
			d3.csv("forestdata.csv", function(data) {

// sort the data, descending
				data.sort(function(a, b) {
					return d3.descending(+a.forest2012Km2, +b.forest2012Km2);
				});

// make axis width scalable to biggest value
				xScale.domain([ 0, 8000000 ]);

// make axis height scalable to biggest value
				yScale.domain([ 70, 0 ]);

// create a circleangle for each line of data
				var circles = svg.selectAll("circle")
								.data(data)
								.enter()
								.append("circle");

// add padding between bars. set fill color. assemble tooltip
				circles.attr("cx", function(d) {
						return xScale(d.forest2012Km2);
						})
					.attr("cy", function(d) {
						return yScale(d.forest2012);
					})
					.attr("r", 0)
					.attr("fill", "green")
					.append("title")
					.text(function(d) {
						return d.country + "'s forest area is " + d.forest2012Km2 + " km2 and cover " + d.forest2012 + "% of the country" ;
					});

circles.sort(function(a, b) {
						return d3.ascending(+a.forest2012Km2, +b.forest2012Km2);
					})
					.transition()
					.delay(function(d, i) {
						return i * 150;
					})
					.duration(2000)
					.attr("r", 7);

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

// draw vertical axis, allow for padding
				svg.append("g")
					.attr("class", "y axis")
					.attr("transform", "translate(" + padding[3] + ",0)")
					.call(yAxis);

});

</script>

<p>Source : Banque mondiale<p>

</body>
</html>

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

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