Chart.js/samples/polar-area.html

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<!doctype html>
<html>
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<head>
<title>Polar Area Chart</title>
<script src="../Chart.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>
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<body>
<div id="canvas-holder" style="width:100%">
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<canvas id="chart-area"></canvas>
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</div>
<button id="randomizeData">Randomize Data</button>
<button id="addData">Add Data</button>
<button id="removeData">Remove Data</button>
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<div>
<h3>Legend</h3>
<div id="legendContainer">
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</div>
</div>
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<script>
var randomScalingFactor = function() {
return Math.round(Math.random() * 100);
};
var randomColorFactor = function() {
return Math.round(Math.random() * 255);
};
var randomColor = function(opacity) {
return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
};
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var config = {
data: {
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datasets: [{
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
],
backgroundColor: [
"#F7464A",
"#46BFBD",
"#FDB45C",
"#949FB1",
"#4D5360",
],
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label: 'My dataset' // for legend
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}],
labels: [
"Red",
"Green",
"Yellow",
"Grey",
"Dark Grey"
]
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},
options: {
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responsive: true,
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legend: {
position: 'top',
},
title: {
display: true,
text: 'Our Favorite Dataset'
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},
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scale: {
ticks: {
beginAtZero: true
},
reverse: false
},
animateRotate:false
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}
};
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window.onload = function() {
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var ctx = document.getElementById("chart-area");
window.myPolarArea = Chart.PolarArea(ctx, config);
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updateLegend();
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};
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function updateLegend() {
$legendContainer = $('#legendContainer');
$legendContainer.empty();
$legendContainer.append(window.myPolarArea.generateLegend());
}
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$('#randomizeData').click(function() {
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$.each(config.data.datasets, function(i, piece) {
$.each(piece.data, function(j, value) {
config.data.datasets[i].data[j] = randomScalingFactor();
config.data.datasets[i].backgroundColor[j] = randomColor();
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});
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});
window.myPolarArea.update();
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updateLegend();
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});
$('#addData').click(function() {
if (config.data.datasets.length > 0) {
config.data.labels.push('dataset #' + config.data.labels.length);
$.each(config.data.datasets, function(i, dataset) {
dataset.backgroundColor.push(randomColor());
dataset.data.push(randomScalingFactor());
});
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window.myPolarArea.update();
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updateLegend();
}
});
$('#removeData').click(function() {
config.data.labels.pop(); // remove the label first
$.each(config.data.datasets, function(i, dataset) {
dataset.backgroundColor.pop();
dataset.data.pop();
});
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window.myPolarArea.update();
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updateLegend();
});
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</script>
</body>
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</html>