This is the code for Chapter 4, Figure 22 from D3.js in Action which loads data and creates several interpolated lines using d3.svg.line().
<html>
<head>
<title>D3 in Action Chapter 4 - Example 12</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", areaChart)
function areaChart(data) {
xScale = d3.scale.linear().domain([1,10.5]).range([20,480]);
yScale = d3.scale.linear().domain([0,35]).range([480,20]);
xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.tickSize(480)
.tickValues([1,2,3,4,5,6,7,8,9,10]);
d3.select("svg").append("g").attr("id", "xAxisG").call(xAxis);
yAxis = d3.svg.axis()
.scale(yScale)
.orient("right")
.ticks(10)
.tickSize(480)
.tickSubdivide(true);
d3.select("svg").append("g").attr("id", "yAxisG").call(yAxis);
for (x in data[0]) {
if (x != "day") {
movieArea = d3.svg.line()
.x(function(d) {
return xScale(d.day)
})
.y(function(d) {
return yScale(d[x])
})
.interpolate("cardinal")
d3.select("svg")
.append("path")
.style("id", x + "Area")
.attr("d", movieArea(data))
.attr("fill", "none")
.attr("stroke", "black")
.attr("stroke-width", 3)
.style("opacity", .75)
}
}
}
</script>
</footer>
</html>