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Ch. 5, Fig. 21 - D3.js in Action

This is the code for Chapter 5, Figure 21 from D3.js in Action showing how to use d3.layout.stack() to create a streamgraph.

<html>
<head>
<title>D3 in Action Chapter 5 - Example 9</title>
<meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
</head>
<style>
svg {
height: 500px;
width: 500px;
border: 1px solid gray;
}
</style>
<body>
<div id="viz">
<svg>
</svg>
</div>
</body>
<footer>
<script>
d3.csv("movies.csv", function(error,data) {dataViz(data)});
function dataViz(incData) {
expData = incData;
stackData = [];
var xScale = d3.scale.linear()
.domain([0, 10])
.range([0, 500]);
var yScale = d3.scale.linear()
.domain([0, 100])
.range([500, 0]);
var movieColors = d3.scale.category10(["movie1","movie2","movie3","movie4","movie5","movie6"]);
var stackArea = d3.svg.area()
.interpolate("basis")
.x(function(d) { return xScale(d.x); })
.y0(function(d) { return yScale(d.y0); })
.y1(function(d) { return yScale(d.y0 + d.y); });
for (x in incData[0]) {
if (x != "day") {
var newMovieObject = {name: x, values: []};
for (y in incData) {
newMovieObject.values.push({x: parseInt(incData[y]["day"]) ,y: parseInt(incData[y][x])})
}
stackData.push(newMovieObject);
}
}
stackLayout = d3.layout.stack()
.offset("silhouette")
.order("inside-out")
.values(function(d) { return d.values; });
d3.select("svg").selectAll("path")
.data(stackLayout(stackData))
.enter().append("path")
.style("fill", function(d) {return movieColors(d.name)})
.attr("d", function(d) { return stackArea(d.values); })
}
</script>
</footer>
</html>
day movie1 movie2 movie3 movie4 movie5 movie6
1 20 8 3 0 0 0
2 18 5 1 13 0 0
3 14 3 1 10 0 0
4 7 3 0 5 27 15
5 4 3 0 2 20 14
6 3 1 0 0 10 13
7 2 0 0 0 8 12
8 0 0 0 0 6 11
9 0 0 0 0 3 9
10 0 0 0 0 1 8
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