This is a graph demonstrating the implimentation of a gradient on an area graph.
This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 6 of d3.js.
license: mit |
This is a graph demonstrating the implimentation of a gradient on an area graph.
This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 6 of d3.js.
date | close | |
---|---|---|
1-May-12 | 58.13 | |
30-Apr-12 | 53.98 | |
27-Apr-12 | 67.00 | |
26-Apr-12 | 89.70 | |
25-Apr-12 | 99.00 | |
24-Apr-12 | 130.28 | |
23-Apr-12 | 166.70 | |
20-Apr-12 | 234.98 | |
19-Apr-12 | 345.44 | |
18-Apr-12 | 443.34 | |
17-Apr-12 | 543.70 | |
16-Apr-12 | 580.13 | |
13-Apr-12 | 605.23 | |
12-Apr-12 | 622.77 | |
11-Apr-12 | 626.20 | |
10-Apr-12 | 628.44 | |
9-Apr-12 | 636.23 | |
5-Apr-12 | 633.68 | |
4-Apr-12 | 624.31 | |
3-Apr-12 | 629.32 | |
2-Apr-12 | 618.63 | |
30-Mar-12 | 599.55 | |
29-Mar-12 | 609.86 | |
28-Mar-12 | 617.62 | |
27-Mar-12 | 614.48 | |
26-Mar-12 | 606.98 |
<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> /* set the CSS */ | |
.area { | |
fill: url(#area-gradient); | |
stroke-width: 0px; | |
} | |
</style> | |
<body> | |
<!-- load the d3.js library --> | |
<script src="https://d3js.org/d3.v6.min.js"></script> | |
<script> | |
// set the dimensions and margins of the graph | |
var margin = {top: 20, right: 20, 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 y = d3.scaleLinear().range([height, 0]); | |
// define the area | |
var area = d3.area() | |
.x(function(d) { return x(d.date); }) | |
.y0(height) | |
.y1(function(d) { return y(d.close); }); | |
// 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("data.csv").then(function(data) { | |
// format the data | |
data.forEach(function(d) { | |
d.date = parseTime(d.date); | |
d.close = +d.close; | |
}); | |
// Scale the range of the data | |
x.domain(d3.extent(data, function(d) { return d.date; })); | |
y.domain([0, d3.max(data, function(d) { return d.close; })]); | |
// set the gradient | |
svg.append("linearGradient") | |
.attr("id", "area-gradient") | |
.attr("gradientUnits", "userSpaceOnUse") | |
.attr("x1", 0).attr("y1", y(0)) | |
.attr("x2", 0).attr("y2", y(1000)) | |
.selectAll("stop") | |
.data([ | |
{offset: "0%", color: "red"}, | |
{offset: "30%", color: "red"}, | |
{offset: "45%", color: "black"}, | |
{offset: "55%", color: "black"}, | |
{offset: "60%", color: "lawngreen"}, | |
{offset: "100%", color: "lawngreen"} | |
]) | |
.enter().append("stop") | |
.attr("offset", function(d) { return d.offset; }) | |
.attr("stop-color", function(d) { return d.color; }); | |
// Add the area. | |
svg.append("path") | |
.data([data]) | |
.attr("class", "area") | |
.attr("d", area); | |
// Add the X Axis | |
svg.append("g") | |
.attr("transform", "translate(0," + height + ")") | |
.call(d3.axisBottom(x)); | |
// Add the Y Axis | |
svg.append("g") | |
.call(d3.axisLeft(y)); | |
}); | |
</script> | |
</body> |