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@Cthulahoop
Last active Oct 5, 2017
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Simple filled area in v4
license: mit

This is a simple graph demonstrating the addition of a filled area in conjunction with a line graph. This was written using d3.js v4 and is a follow on to the simple 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.

forked from d3noob's block: Simple filled area in v4

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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 */
.line {
fill: none;
stroke: rgba(0,128,255,0.5);
stroke-width: 2px;
}
.area {
fill: rgba(0,128,255,0.2);
}
.chart:hover .line {
stroke: rgba(0,128,255,1);
}
</style>
<body>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
console.clear();
// 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;
// set the ranges
var x = d3.scaleLinear().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
// define the area
var area = d3.area()
.x(function(d,i) { return x(d.x0); })
.y0(height)
.y1(function(d) { return y(d.length); });
// define the line
var valueline = d3.line()
.x(function(d) { return x(d.x0); })
.y(function(d) { return y(d.length); });
// 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)
.attr('class','chart')
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
render();
function render() {
// generate data
var data = d3.range(2000).map(d3.randomBates(6));
var bins=d3.histogram().thresholds(x.ticks(200))(data);
// scale the range of the data
x.domain(d3.extent(bins, function(d,i) { return d.x0; })).nice(2);
y.domain(d3.extent(bins, function(d) { return d.length; })).nice();
// add the area
var a = svg.selectAll('.area')
.data([bins]); // must cast as array
var l = svg.selectAll('.line')
.data([bins]);
// enter
a.enter()
.append("path")
.attr("class", "area")
.transition()
.duration(250)
.attr("d", area);
// update
a.transition()
.duration(250)
.attr("d", area);
// exit
a.exit().remove();
// enter
l.enter()
.append("path")
.attr("class", "line")
.transition()
.duration(250)
.attr("d", valueline);
// update
l.transition()
.duration(250)
.attr("d", valueline);
// exit
l.exit().remove();
// add the X Axis
var axisx = svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// add the Y Axis
svg.append("g")
.call(d3.axisLeft(y));
}
svg.on('click', function(){
render();
});
</script>
</body>
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