function onRefresh(chart) {
	var t = Date.now();
	var data = chart.data.datasets[0].data;
	var last;

	t -= t % 5000;
	if (data.length === 0) {
		data.push({ t: t - 5000, o: 99, h: 101, l: 98, c: 100 });
	}
	last = data[data.length - 1];
	if (t != last.t) {
		var c = last.c;
		last = { t: t, o: c, h: c, l: c, c: c };
		data.push(last);
	}
	last.c += Math.random() - 0.5;
	last.h = Math.max(last.h, last.c);
	last.l = Math.min(last.l, last.c);
}

var config = {
	type: 'candlestick',
	data: {
		datasets: [{
			data: [],
			fractionalDigitsCount: 2
		}]
	},
	options: {
		title: {
			display: true,
			text: 'Financial chart sample'
		},
		legend: {
			display: false,
		},
		scales: {
			xAxes: [{
				type: 'realtime',
				realtime: {
					duration: 120000,
					refresh: 500,
					delay: 0,
					onRefresh: onRefresh
				}
			}]
		},
		tooltips: {
			position: 'nearest',
			intersect: false
		},
		animation: {
			duration: 0
		}
	}
};

window.onload = function() {
	var ctx = document.getElementById('myChart').getContext('2d');
	window.myChart = new Chart(ctx, config);
};