c3 - flow data

HTML

<script src="https://rawgit.com/masayuki0812/c3/master/c3.js"></script>
<link rel="stylesheet" href="https://rawgit.com/masayuki0812/c3/master/c3.css">
<div id="chart"></div>

JavaScript

var chart = c3.generate({
    data: {
        rows: [
            ['data4', 'data2', 'data3'],
            [90, 120, 300],
            [40, 160, 240],
            [50, 200, 290],
            [120, 160, 230],
            [80, 130, 300],
            [90, 220, 320]
        ],
        type: 'bar'
    }
});

setTimeout(function () {
	      			chart.transform('line', 'data4');
	      		}, 2500);
	      		setTimeout(function () {
	      			chart.transform('area', 'data2');
	      		}, 5000);
	      		setTimeout(function () {
	      			chart.transform('spline', 'data3');
	      		}, 7500);