Module 4, exercice 4 (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;
			}

rect: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: 0;
			}

</style>
	</head>
	<body>

<h1> Top 20 countries by woodland </h1>
		<p> Forest area per country &#40km<SUP>2</SUP>, 2012&#41</p>

// set width and height of viz, plus padding
			var w = 700;
			var h = 600;
			var padding = [ 10, 25, 20, 120 ];  //Top, right, bottom, left

// make width scale, set as linear (to hold numbers). Subtract padding
			var widthScale = d3.scale.linear()
								.range([ 0, w - padding[1] - padding[3] ]);

// make height scale, set as ordinal (eg categories). Subtract padding.			
			var heightScale = d3.scale.ordinal()
								.rangeRoundBands([ padding[0], h - padding[2] ], 0.2);

// create horizontal axis and place it on the bottom
			var xAxis = d3.svg.axis()
							.scale(widthScale)
							.orient("bottom");

// create veritcal axis and place it on the left
			var yAxis = d3.svg.axis()
							.scale(heightScale)
							.orient("left");

// 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
				widthScale.domain([ 0, d3.max(data, function(d) {
					return +d.forest2012Km2;
				}) ]);

// make axis height scalable to biggest value
				heightScale.domain(data.map(function(d) { return d.country; } ));

// create a rectangle for each line of data
				var rects = svg.selectAll("rect")
								.data(data)
								.enter()
								.append("rect");

// add padding between bars. set fill color. assemble tooltip
				rects.attr("x", padding[3])
					.attr("y", function(d) {
						return heightScale(d.country);
					})
					.attr("width", function(d) {
						return widthScale(d.forest2012Km2);
					})
					.attr("height", heightScale.rangeBand())
					.attr("fill", "green")
					.append("title")
					.text(function(d) {
						return d.country + "'s forest area is " + d.forest2012Km2 + " km2" ;
					});

// draw horizontal axis, allow for padding
				svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(" + padding[3] + "," + (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