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<!doctype html>
<html>
<head>
<title>Polar Area Chart</title>
<script src="../../dist/Chart.min.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 id="canvas-holder" style="width:50%">
<canvas id="chart-area"></canvas>
</div>
<button id="randomizeData">Randomize Data</button>
<button id="addData">Add Data</button>
<button id="removeData">Remove Data</button>
<script>
var randomScalingFactor = function() {
return Math.round(Math.random() * 100);
};
var chartColors = window.chartColors;
var color = Chart.helpers.color;
var config = {
data: {
datasets: [{
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
],
backgroundColor: [
color(chartColors.red).alpha(0.5).rgbString(),
color(chartColors.orange).alpha(0.5).rgbString(),
color(chartColors.yellow).alpha(0.5).rgbString(),
color(chartColors.green).alpha(0.5).rgbString(),
color(chartColors.blue).alpha(0.5).rgbString(),
],
label: 'My dataset' // for legend
}],
labels: [
'Red',
'Orange',
'Yellow',
'Green',
'Blue'
]
},
options: {
responsive: true,
legend: {
position: 'right',
},
title: {
display: true,
text: 'Chart.js Polar Area Chart'
},
scale: {
ticks: {
beginAtZero: true
},
reverse: false
},
animation: {
animateRotate: false,
animateScale: true
}
}
};
window.onload = function() {
var ctx = document.getElementById('chart-area');
window.myPolarArea = Chart.PolarArea(ctx, config);
};
document.getElementById('randomizeData').addEventListener('click', function() {
config.data.datasets.forEach(function(piece, i) {
piece.data.forEach(function(value, j) {
config.data.datasets[i].data[j] = randomScalingFactor();
});
});
window.myPolarArea.update();
});
var colorNames = Object.keys(window.chartColors);
document.getElementById('addData').addEventListener('click', function() {
if (config.data.datasets.length > 0) {
config.data.labels.push('data #' + config.data.labels.length);
config.data.datasets.forEach(function(dataset) {
var colorName = colorNames[config.data.labels.length % colorNames.length];
dataset.backgroundColor.push(window.chartColors[colorName]);
dataset.data.push(randomScalingFactor());
});
window.myPolarArea.update();
}
});
document.getElementById('removeData').addEventListener('click', function() {
config.data.labels.pop(); // remove the label first
config.data.datasets.forEach(function(dataset) {
dataset.backgroundColor.pop();
dataset.data.pop();
});
window.myPolarArea.update();
});
</script>
</body>
</html>