D3 Examples - Module 2 : Stacked area chart

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<!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">
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            body {
                background-color: #222222;
                font-family: Helvetica, sans-serif;
            }
                
            .content {
                width: 800px;
                margin:0 auto;
                padding:50px;
                text-align: center;
            }
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            h1 {
                font-size: 24px;
                margin: 0;
                color:#ffffff;
            }
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            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>
​
            <div class="chart"></div>
        </div>
        <script type="text/javascript">     
​
​
    var stack = d3.layout.stack()
                            .values(function(d) {
                                return d.population;
                            })
                            .order("reverse");
​
​
​
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            var w = 800;
            var h = 500;
            var padding = [ 20, 10, 50, 100 ];
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            var dateFormat = d3.time.format("%Y");
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            var xScale = d3.time.scale()
                                .range([ padding[3], w - padding[1] - padding[3] ]);
            
            var yScale = d3.scale.linear()
                                .range([ padding[0], h - padding[2] ]);
​
​
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            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 area = d3.svg.area()
                .x(function(d) {
                    return xScale(dateFormat.parse(d.x));
                })
                .y0(function(d) {
                    return yScale(d.y0);  
                })
                .y1(function(d) {
                    return yScale(d.y0 + d.y);  
                });
​
            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) {
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                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 = [];
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                for (var i = 0; i < data.length; i++) {
​
                
                    dataset[i] = {
                        regionName: data[i].regionName,
                        population: []
                    };
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                    for (var j = 0; j < years.length; j++) {
​
                        
                        var population = null;
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                        if (data[i][years[j]]) {
                            population = +data[i][years[j]];
                        }
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                        dataset[i].population.push({
                            x: years[j],
                            y: population
                        });
​
                    }
​
                }
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                stack(dataset);
​
        
                xScale.domain([ 
                    d3.min(years, function(d) {
                        return dateFormat.parse(d);
                    }),
                    d3.max(years, function(d) {
                        return dateFormat.parse(d);
                    })
                ]);
​
                
                var totals = [];
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                for (i = 0; i < years.length; i++) {
                    totals[i] = 0;
                    for (j = 0; j < dataset.length; j++) {
                        totals[i] += dataset[j].population[i].y;
                    }
                }
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                yScale.domain([ d3.max(totals), 0 ]);
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                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>
    