interactive-vis-course/Week9/area_plot.html at gh-pages · arnicas/interactive-vis-course · GitHub

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<!DOCTYPE html>
<!-- modification of code from Scott Murray -->
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Area Chart with Multiple Areas</title>
		<script type="text/javascript" src="../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;
			}

			.area {
				fill: steelblue;
				stroke: none;
				opacity: 0.1;
			}

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

			.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}

		</style>
	</head>
	<body>

		<h1>CO2 Emissions by Country Area Plot</h1>

		<p>Carbon dioxide emissions, 1961-2010. Data not available for the entire period for all countries. From an example by Scott Murray. Source: <a href="http://data.worldbank.org/indicator/EN.ATM.CO2E.KT?page=6">World Bank</a>, 2014</p>

		<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
		<script type="text/javascript">


			//Dimensions and padding

			var fullwidth = 700;
			var fullheight = 600;
			var margin = {top: 20, right: 10, bottom: 40, left:100};

			var width = fullwidth - margin.left - margin.right;
			var height = fullheight - margin.top - margin.bottom;


			//Set up date formatting and years
			var dateFormat = d3.time.format("%Y");


			//Set up scales
			var xScale = d3.time.scale()
								.range([ 0, width ]);

			var yScale = d3.scale.linear()
								.range([ 0, height ]);


			//Configure axis generators
			var xAxis = d3.svg.axis()
							.scale(xScale)
							.orient("bottom")
							.ticks(15)
							.tickFormat(function(d) {
								return dateFormat(d);
							});

			var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left");


			//Configure area generator
			var area = d3.svg.area()
				.x(function(d) {
					return xScale(dateFormat.parse(d.year));
				})
				.y0(height)
				.y1(function(d) {
					return yScale(+d.amount);
				});


			//Create the empty SVG image
			var svg = d3.select("body")
						.append("svg")
						.attr("width", fullwidth)
						.attr("height", fullheight)
						.append("g")
						.attr("transform", "translate(" + margin.left + "," + margin.top + ")");


			//Load data
			d3.csv("data/co2_emissions.csv", function(data) {


				//New array with all the years, for referencing later
				var years = ["1961", "1962", "1963", "1964", "1965", "1966", "1967", "1968", "1969", "1970", "1971", "1972", "1973", "1974", "1975", "1976", "1977", "1978", "1979", "1980", "1981", "1982", "1983", "1984", "1985", "1986", "1987", "1988", "1989", "1990", "1991", "1992", "1993", "1994", "1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008", "2009", "2010"];

				//Create a new, empty array to hold our restructured dataset
				var dataset = [];


				data.forEach(function (d, i) {

					var myEmissions = [];

					//Loop through all the years - and get the emissions for this data element
					years.forEach(function (y) {

						// If value is not empty
						if (d[y]) {
							//Add a new object to the new emissions data array - for year, amount
							myEmissions.push({
								country: d.countryName, // we can put the country in here too. It won't hurt.
								year: y,
								amount: d[y]  // this is the value for, for example, d["2004"]
 							});
						}

					});

					//Create new object with this country's name and empty array
					// d is the current data row... from data.forEach above.
					dataset.push( {
						country: d.countryName,
						emissions: myEmissions  // we just built this!
						} );

				});


				//Set scale domains
				xScale.domain(d3.extent(years, function (d) {
						return dateFormat.parse(d);
					})
				);

				yScale.domain([
					d3.max(dataset, function(d) {
						return d3.max(d.emissions, function(d) {
							return +d.amount;
						});
					}),
					0
				]);


				//Make a group for each country
				var groups = svg.selectAll("g")
					.data(dataset)
					.enter()
					.append("g");

				//Append a title with the country name (so we get easy tooltips)
				groups.append("title")
					.text(function(d) {
						return d.country;
					});

				//Within each group, create a new path,
				//binding just the emissions data to each one
				groups.selectAll("path")
					.data(function(d) {
						return [ d.emissions ];
					})
					.enter()
					.append("path")
					.attr("class", "area")
					.attr("d", area);


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

				svg.append("g")
					.attr("class", "y axis")
					.call(yAxis);

			});


		</script>

	</body>
</html>