<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src=
</script>
</head>
<body>
<h1 style="text-align: center; color: green;">
GeeksforGeeks
</h1>
<center>
<canvas id="gfg" width="200" height="200">
</canvas>
</center>
<script>
var data = [
{a: 3840, b: 1920, c: 960, d: 400},
{a: 1600, b: 1440, c: 960, d: 400},
{a: 640, b: 960, c: 640, d: 400},
{a: 320, b: 480, c: 640, d: 400}
];
var stackGen = d3.stack()
.keys(["a", "b", "c", "d"])
.order(d3.stackOrderNone)
.offset(d3.stackOffsetNone);
var stack = stackGen(data);
for(var i=0;i<4;i++){
console.log(stack[i]);
}
</script>
</body>
</html>