index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
</head>
<style>
.viz-area .area{
fill: steelblue;
stroke: none;
}
</style>
<body>
<svg width="960" height="600">
<g transform="translate(50,50)"></g>
</svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="//vizjs.org/viz.v1.3.0.min.js"></script>
<script>
var area = viz.area()
.data(randomData())
.curve(d3.curveBasis)
.ease(d3.easeBounceOut)
.value0(function(d){ return d.value0;})
.value1(function(d){ return d.value1;})
d3.select("g").call(area)
setInterval(update,2000)
function update(){
area.data(randomData())
.valueScale(undefined)
area.transition()
}
function randomData(){
return d3.range(20).map(function(i){ var y1= Math.random(); return {key:i, value1:y1, value0: y1*Math.random()}; })
}
</script>