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File: radar-skip-points.html
<!doctype html>
<html>

<head>
	<title>Radar Chart</title>
	<script src="../../Chart.bundle.js"></script>
	<script src="../utils.js"></script>
	<style>
		canvas {
			-moz-user-select: none;
			-webkit-user-select: none;
			-ms-user-select: none;
		}
	</style>
</head>

<body>
	<div style="width:40%">
		<canvas id="canvas"></canvas>
	</div>
	<button id="randomizeData">Randomize Data</button>
	<script>
		var randomScalingFactor = function() {
			return Math.round(Math.random() * 100);
		};

		var color = Chart.helpers.color;
		var config = {
			type: 'radar',
			data: {
				labels: ['Eating', 'Drinking', 'Sleeping', 'Designing', 'Coding', 'Cycling', 'Running'],
				datasets: [{
					label: 'Skip first dataset',
					borderColor: window.chartColors.red,
					backgroundColor: color(window.chartColors.red).alpha(0.2).rgbString(),
					pointBackgroundColor: window.chartColors.red,
					data: [
						NaN,
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor()
					]
				}, {
					label: 'Skip mid dataset',
					borderColor: window.chartColors.blue,
					backgroundColor: color(window.chartColors.blue).alpha(0.2).rgbString(),
					pointBackgroundColor: window.chartColors.blue,
					data: [
						randomScalingFactor(),
						randomScalingFactor(),
						NaN,
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor()
					]
				}, {
					label: 'Skip last dataset',
					borderColor: window.chartColors.green,
					backgroundColor: color(window.chartColors.green).alpha(0.2).rgbString(),
					pointBackgroundColor: window.chartColors.green,
					data: [
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						NaN
					]
				}]
			},
			options: {
				title: {
					display: true,
					text: 'Chart.js Radar Chart - Skip Points'
				},
				elements: {
					line: {
						tension: 0.0,
					}
				},
				scale: {
					beginAtZero: true,
				}
			}
		};

		window.onload = function() {
			window.myRadar = new Chart(document.getElementById('canvas'), config);
		};

		document.getElementById('randomizeData').addEventListener('click', function() {
			config.data.datasets.forEach(function(dataset) {
				dataset.data = dataset.data.map(function() {
					return randomScalingFactor();
				});

			});

			window.myRadar.update();
		});
	</script>
</body>

</html>