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Last active November 26, 2019 18:22
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Dual axes in v5
license: gpl-3.0

This is a multiple line graph demonstrating the display of seperate colour coded y axes for each line. This was written using d3.js v4 and is a follow on to the multiple line graph example here.

This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 4 of d3.js.

date close open
1-May-12 58.13 3.41
30-Apr-12 53.98 4.55
27-Apr-12 67.00 6.78
26-Apr-12 89.70 7.85
25-Apr-12 99.00 8.92
24-Apr-12 130.28 9.92
23-Apr-12 166.70 10.13
20-Apr-12 234.98 12.23
19-Apr-12 345.44 13.45
18-Apr-12 443.34 16.04
17-Apr-12 543.70 18.03
16-Apr-12 580.13 21.02
13-Apr-12 605.23 22.34
12-Apr-12 622.77 20.15
11-Apr-12 626.20 21.26
10-Apr-12 628.44 31.04
9-Apr-12 636.23 35.04
5-Apr-12 633.68 41.02
4-Apr-12 624.31 43.05
3-Apr-12 629.32 46.03
2-Apr-12 618.63 51.03
30-Mar-12 599.55 53.42
29-Mar-12 609.86 57.82
28-Mar-12 617.62 59.01
27-Mar-12 614.48 56.03
26-Mar-12 606.98 58.01
<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
.line {
fill: none;
stroke: steelblue;
stroke-width: 2px;
}
.axisSteelBlue text{
fill: steelblue;
}
.axisRed text{
fill: red;
}
</style>
<body>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var margin = {top: 20, right: 40, bottom: 30, left: 50},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// parse the date / time
var parseTime = d3.timeParse("%d-%b-%y");
// set the ranges
var x = d3.scaleTime().range([0, width]);
var y0 = d3.scaleLinear().range([height, 0]);
var y1 = d3.scaleLinear().range([height, 0]);
// define the 1st line
var valueline = d3.line()
.x(function(d) { return x(d.date); })
.y(function(d) { return y0(d.close); });
// define the 2nd line
var valueline2 = d3.line()
.x(function(d) { return x(d.date); })
.y(function(d) { return y1(d.open); });
// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
// Get the data
d3.csv("data4.csv", function(error, data) {
if (error) throw error;
// format the data
data.forEach(function(d) {
d.date = parseTime(d.date);
d.close = +d.close;
d.open = +d.open;
});
// Scale the range of the data
x.domain(d3.extent(data, function(d) { return d.date; }));
y0.domain([0, d3.max(data, function(d) {return Math.max(d.close);})]);
y1.domain([0, d3.max(data, function(d) {return Math.max(d.open); })]);
// Add the valueline path.
svg.append("path")
.data([data])
.attr("class", "line")
.attr("d", valueline);
// Add the valueline2 path.
svg.append("path")
.data([data])
.attr("class", "line")
.style("stroke", "red")
.attr("d", valueline2);
// Add the X Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// Add the Y0 Axis
svg.append("g")
.attr("class", "axisSteelBlue")
.call(d3.axisLeft(y0));
// Add the Y1 Axis
svg.append("g")
.attr("class", "axisRed")
.attr("transform", "translate( " + width + ", 0 )")
.call(d3.axisRight(y1));
});
</script>
</body>
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