1072 lines
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1072 lines
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Animations
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Layout
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Elements
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Line
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Radar
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Polar Area
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Bubble
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Scatter
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Area
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Axes
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<a href="../axes/cartesian/">
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Cartesian
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<ul class="articles">
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<a href="../axes/cartesian/category.html">
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Category
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</a>
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<a href="../axes/cartesian/linear.html">
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Linear
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</a>
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</li>
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<li class="chapter " data-level="1.6.1.3" data-path="../axes/cartesian/logarithmic.html">
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<a href="../axes/cartesian/logarithmic.html">
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Logarithmic
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</a>
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</li>
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<li class="chapter " data-level="1.6.1.4" data-path="../axes/cartesian/time.html">
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<a href="../axes/cartesian/time.html">
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Time
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.6.2" data-path="../axes/radial/">
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<a href="../axes/radial/">
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Radial
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.6.2.1" data-path="../axes/radial/linear.html">
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<a href="../axes/radial/linear.html">
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Linear
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.6.3" data-path="../axes/labelling.html">
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<a href="../axes/labelling.html">
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Labelling
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</a>
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</li>
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<li class="chapter " data-level="1.6.4" data-path="../axes/styling.html">
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<a href="../axes/styling.html">
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Styling
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</a>
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</li>
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</ul>
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<li class="chapter " data-level="1.7" data-path="../developers/">
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<a href="../developers/">
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Developers
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.7.1" data-path="../developers/api.html">
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<a href="../developers/api.html">
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Chart.js API
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</a>
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<li class="chapter " data-level="1.7.2" data-path="../developers/updates.html">
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<a href="../developers/updates.html">
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Updating Charts
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</a>
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</li>
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<li class="chapter " data-level="1.7.3" data-path="../developers/plugins.html">
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<a href="../developers/plugins.html">
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Plugins
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</a>
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</li>
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<li class="chapter " data-level="1.7.4" data-path="../developers/charts.html">
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<a href="../developers/charts.html">
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New Charts
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</a>
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</li>
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<li class="chapter " data-level="1.7.5" data-path="../developers/axes.html">
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<a href="../developers/axes.html">
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New Axes
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</a>
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</li>
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<li class="chapter " data-level="1.7.6" data-path="../developers/contributing.html">
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<a href="../developers/contributing.html">
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Contributing
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</a>
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</li>
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</ul>
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<li class="chapter " data-level="1.8" data-path="../notes/">
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<a href="../notes/">
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Additional Notes
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.8.1" data-path="../notes/comparison.html">
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<a href="../notes/comparison.html">
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Polar Area</a>
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</h1>
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</div>
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<div class="page-wrapper" tabindex="-1" role="main">
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<div class="search-plus" id="book-search-results">
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<div class="search-noresults">
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<section class="normal markdown-section">
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<h1 id="polar-area">Polar Area</h1>
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<p>Polar area charts are similar to pie charts, but each segment has the same angle - the radius of the segment differs depending on the value.</p>
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<p>This type of chart is often useful when we want to show a comparison data similar to a pie chart, but also show a scale of values for context.</p>
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<p><div class="chartjs-wrapper"><canvas id="chartjs-5" class="chartjs" width="undefined" height="undefined"></canvas><script>new Chart(document.getElementById("chartjs-5"),{"type":"polarArea","data":{"labels":["Red","Green","Yellow","Grey","Blue"],"datasets":[{"label":"My First Dataset","data":[11,16,7,3,14],"backgroundColor":["rgb(255, 99, 132)","rgb(75, 192, 192)","rgb(255, 205, 86)","rgb(201, 203, 207)","rgb(54, 162, 235)"]}]}});</script></div></p>
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<h2 id="example-usage">Example Usage</h2>
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<pre><code class="lang-javascript"><span class="hljs-keyword">new</span> Chart(ctx, {
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data: data,
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type: <span class="hljs-string">'polarArea'</span>,
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options: options
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});
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</code></pre>
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<h2 id="dataset-properties">Dataset Properties</h2>
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<p>The following options can be included in a polar area chart dataset to configure options for that specific dataset.</p>
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<table>
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>backgroundColor</code></td>
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<td><code>Color[]</code></td>
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<td>The fill color of the arcs in the dataset. See <a href="../general/colors.html#colors">Colors</a></td>
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</tr>
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<tr>
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<td><code>borderColor</code></td>
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<td><code>Color[]</code></td>
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<td>The border color of the arcs in the dataset. See <a href="../general/colors.html#colors">Colors</a></td>
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</tr>
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<tr>
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<td><code>borderWidth</code></td>
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<td><code>Number[]</code></td>
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<td>The border width of the arcs in the dataset.</td>
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</tr>
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<tr>
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<td><code>hoverBackgroundColor</code></td>
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<td><code>Color[]</code></td>
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<td>The fill colour of the arcs when hovered.</td>
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</tr>
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<tr>
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<td><code>hoverBorderColor</code></td>
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<td><code>Color[]</code></td>
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<td>The stroke colour of the arcs when hovered.</td>
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</tr>
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<tr>
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<td><code>hoverBorderWidth</code></td>
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<td><code>Number[]</code></td>
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<td>The stroke width of the arcs when hovered.</td>
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</tr>
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</tbody>
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</table>
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<h2 id="config-options">Config Options</h2>
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|
<p>These are the customisation options specific to Polar Area charts. These options are merged with the <a href="#default-options">global chart default options</a>, and form the options of the chart.</p>
|
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<table>
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<thead>
|
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<tr>
|
|
<th>Name</th>
|
|
<th>Type</th>
|
|
<th>Default</th>
|
|
<th>Description</th>
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</tr>
|
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</thead>
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<tbody>
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<tr>
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<td><code>startAngle</code></td>
|
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<td><code>Number</code></td>
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<td><code>-0.5 * Math.PI</code></td>
|
|
<td>Starting angle to draw arcs for the first item in a dataset.</td>
|
|
</tr>
|
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<tr>
|
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<td><code>animation.animateRotate</code></td>
|
|
<td><code>Boolean</code></td>
|
|
<td><code>true</code></td>
|
|
<td>If true, the chart will animate in with a rotation animation. This property is in the <code>options.animation</code> object.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>animation.animateScale</code></td>
|
|
<td><code>Boolean</code></td>
|
|
<td><code>true</code></td>
|
|
<td>If true, will animate scaling the chart from the center outwards.</td>
|
|
</tr>
|
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</tbody>
|
|
</table>
|
|
<h2 id="default-options">Default Options</h2>
|
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<p>We can also change these defaults values for each PolarArea type that is created, this object is available at <code>Chart.defaults.polarArea</code>. Changing the global options only affects charts created after the change. Existing charts are not changed.</p>
|
|
<p>For example, to configure all new polar area charts with <code>animateScale = false</code> you would do:</p>
|
|
<pre><code class="lang-javascript">Chart.defaults.polarArea.animation.animateScale = <span class="hljs-literal">false</span>;
|
|
</code></pre>
|
|
<h2 id="data-structure">Data Structure</h2>
|
|
<p>For a polar area chart, datasets need to contain an array of data points. The data points should be a number, Chart.js will total all of the numbers and calculate the relative proportion of each.</p>
|
|
<p>You also need to specify an array of labels so that tooltips appear correctly for each slice.</p>
|
|
<pre><code class="lang-javascript">data = {
|
|
datasets: [{
|
|
data: [<span class="hljs-number">10</span>, <span class="hljs-number">20</span>, <span class="hljs-number">30</span>]
|
|
}],
|
|
|
|
<span class="hljs-comment">// These labels appear in the legend and in the tooltips when hovering different arcs</span>
|
|
labels: [
|
|
<span class="hljs-string">'Red'</span>,
|
|
<span class="hljs-string">'Yellow'</span>,
|
|
<span class="hljs-string">'Blue'</span>
|
|
]
|
|
};
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</code></pre>
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