This is the code for Chapter 5, Figure 22 from D3.js in Action showing how to use d3.layout.stack() to create a stacked bar chart.
<html>
<head>
<title>D3 in Action Chapter 5 - Example 10</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;
}
line {
shape-rendering: crispEdges;
stroke: #000000;
}
line.minor {
stroke: #777777;
stroke-dasharray: 2,2;
}
path.domain {
fill: none;
stroke: black;
}
</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([1, 10])
.range([20, 440]);
var yScale = d3.scale.linear()
.domain([0, 70])
.range([480, 0]);
var heightScale = d3.scale.linear()
.domain([0, 70])
.range([0, 480]);
var movieColors = d3.scale.category10(["movie1","movie2","movie3","movie4","movie5","movie6"]);
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()
.values(function(d) { return d.values; });
xAxis = d3.svg.axis().scale(xScale).orient("bottom").tickSize(480).ticks(10);
d3.select("svg").append("g").attr("id", "xAxisG").call(xAxis);
yAxis = d3.svg.axis().scale(yScale).orient("right").ticks(8).tickSize(480).tickSubdivide(true);
d3.select("svg").append("g").attr("id", "yAxisG").call(yAxis);
d3.select("svg").selectAll("g.bar")
.data(stackLayout(stackData))
.enter()
.append("g")
.attr("class", "bar")
.each(function(d) {
d3.select(this).selectAll("rect")
.data(d.values)
.enter()
.append("rect")
.attr("x", function(p) { return xScale(p.x) - 15; })
.attr("y", function(p) { return yScale(p.y + p.y0); })
.attr("height", function(p) { return heightScale(p.y); })
.attr("width", 30)
.style("fill", movieColors(d.name))
})
}
</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