Module 2 : Stacked area chart

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Stacked area chart</title>
	    <script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
            <style type="text/css">

body {
				background-color: #222222;
				font-family: Helvetica, sans-serif;
			}
                
            .content {
                width: 800px;
                margin:0 auto;
                padding:50px;
                text-align: center;
            }

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

p {
				font-size: 14px;
                color:#cccccc;
			}
                
			path:hover {
				opacity:1;
			}
			
			.axis path,
			.axis line {
				fill: none;
				stroke: #888888;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
                fill:#888888;
			}

</style>
	</head>
	<body>
        <div class="content">
            <h1>Population at regional level in South Korea</h1>
            <p>South Korea's total population is 20,724,094 in 2014. 
           <br> And the area in South Korea with the largest population is Seoul and Gyeonggi.</p>
            <p>1992-2014, Source : Korea Statistical information Service</p>
            <p>Songyi Lim, www.attrs.co.kr</p>

var stack = d3.layout.stack()
							.values(function(d) {
								return d.population;
							})
							.order("reverse");

var w = 800;
			var h = 500;
			var padding = [ 20, 10, 50, 100 ];

var dateFormat = d3.time.format("%Y");

var xScale = d3.time.scale()
								.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 dateFormat(d);
							});

var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left")
							.ticks(5);

var color = d3.scale.category10();

var svg = d3.select(".chart")
						.append("svg")
						.attr("width", w)
						.attr("height", h);
            
            var color = d3.scale.ordinal()
            .range(["#FADBAE", "#FFC794 ", "#FFA16D ", "#FC7F58 ", "#FF7865 "]);

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

var years = ["1992", "1993", "1994", "1995", "1996", "1997", "1998", "1999", "2000", 
                             "2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008", "2009", "2010",
                            "2011","2012","2013","2014"];

var dataset = [];

for (var i = 0; i < data.length; i++) {

dataset[i] = {
						regionName: data[i].regionName,
						population: []
					};

for (var j = 0; j < years.length; j++) {

var population = null;

if (data[i][years[j]]) {
							population = +data[i][years[j]];
						}

dataset[i].population.push({
							x: years[j],
							y: population
						});

}

stack(dataset);

xScale.domain([ 
					d3.min(years, function(d) {
						return dateFormat.parse(d);
					}),
					d3.max(years, function(d) {
						return dateFormat.parse(d);
					})
				]);

var totals = [];

for (i = 0; i < years.length; i++) {
					totals[i] = 0;
					for (j = 0; j < dataset.length; j++) {
						totals[i] += dataset[j].population[i].y;
					}
				}

yScale.domain([ d3.max(totals), 0 ]);

var paths = svg.selectAll("path")
					.data(dataset)
					.enter()
					.append("path")
					.attr("class", "area")
					.attr("d", function(d) {
						return area(d.population);
					})
					.attr("stroke", "none")
					.attr("fill", function(d, i) {
						return color(i);
					})
          .attr("opacity",0.8);

paths.append("title")
					.text(function(d) {
						return d.regionName;
					});

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

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

});
		</script>
	</body>
</html>

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