1091 lines
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1091 lines
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Getting Started
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General
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Responsive
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Pixel Ratio
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Interactions
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Events
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Modes
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Options
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Colors
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Fonts
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Configuration
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Animations
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Layout
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Legend
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Title
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Tooltip
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Elements
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<li class="chapter " data-level="1.5" data-path="./">
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Charts
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<ul class="articles">
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Line
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Bar
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<li class="chapter " data-level="1.5.3" data-path="radar.html">
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<a href="radar.html">
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Radar
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</a>
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</li>
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<li class="chapter active" data-level="1.5.4" data-path="doughnut.html">
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<a href="doughnut.html">
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Doughnut & Pie
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</a>
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</li>
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<li class="chapter " data-level="1.5.5" data-path="polar.html">
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<a href="polar.html">
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Polar Area
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<a href="bubble.html">
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Bubble
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</a>
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Scatter
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Area
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</li>
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Mixed
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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" data-path="../axes/">
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<a href="../axes/">
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Axes
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.6.1" data-path="../axes/cartesian/">
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<a href="../axes/cartesian/">
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Cartesian
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.6.1.1" data-path="../axes/cartesian/category.html">
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<a href="../axes/cartesian/category.html">
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Category
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</a>
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</li>
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<li class="chapter " data-level="1.6.1.2" data-path="../axes/cartesian/linear.html">
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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>
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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>
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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>
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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=".." >Doughnut & Pie</a>
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</h1>
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<div class="search-noresults">
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<section class="normal markdown-section">
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<h1 id="doughnut-and-pie">Doughnut and Pie</h1>
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<p>Pie and doughnut charts are probably the most commonly used charts. They are divided into segments, the arc of each segment shows the proportional value of each piece of data.</p>
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<p>They are excellent at showing the relational proportions between data.</p>
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<p>Pie and doughnut charts are effectively the same class in Chart.js, but have one different default value - their <code>cutoutPercentage</code>. This equates what percentage of the inner should be cut out. This defaults to <code>0</code> for pie charts, and <code>50</code> for doughnuts.</p>
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<p>They are also registered under two aliases in the <code>Chart</code> core. Other than their different default value, and different alias, they are exactly the same.</p>
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<p><div class="chartjs-wrapper"><canvas id="chartjs-4" class="chartjs" width="undefined" height="undefined"></canvas><script>new Chart(document.getElementById("chartjs-4"),{"type":"doughnut","data":{"labels":["Red","Blue","Yellow"],"datasets":[{"label":"My First Dataset","data":[300,50,100],"backgroundColor":["rgb(255, 99, 132)","rgb(54, 162, 235)","rgb(255, 205, 86)"]}]}});</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-comment">// For a pie chart</span>
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<span class="hljs-keyword">var</span> myPieChart = <span class="hljs-keyword">new</span> Chart(ctx,{
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type: <span class="hljs-string">'pie'</span>,
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data: data,
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options: options
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});
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</code></pre>
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<pre><code class="lang-javascript"><span class="hljs-comment">// And for a doughnut chart</span>
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<span class="hljs-keyword">var</span> myDoughnutChart = <span class="hljs-keyword">new</span> Chart(ctx, {
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type: <span class="hljs-string">'doughnut'</span>,
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data: data,
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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 doughnut/pie chart allows a number of properties to be specified for each dataset. These are used to set display properties for a specific dataset. For example, the colour of a the dataset's arc are generally set this way.</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>
|
|
<td>The stroke width of the arcs when hovered.</td>
|
|
</tr>
|
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</tbody>
|
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</table>
|
|
<h2 id="config-options">Config Options</h2>
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|
<p>These are the customisation options specific to Pie & Doughnut charts. These options are merged with the global chart configuration options, and form the options of the chart.</p>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Name</th>
|
|
<th>Type</th>
|
|
<th>Default</th>
|
|
<th>Description</th>
|
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</tr>
|
|
</thead>
|
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<tbody>
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<tr>
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<td><code>cutoutPercentage</code></td>
|
|
<td><code>Number</code></td>
|
|
<td><code>50</code> - for doughnut, <code>0</code> - for pie</td>
|
|
<td>The percentage of the chart that is cut out of the middle.</td>
|
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</tr>
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<tr>
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<td><code>rotation</code></td>
|
|
<td><code>Number</code></td>
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|
<td><code>-0.5 * Math.PI</code></td>
|
|
<td>Starting angle to draw arcs from.</td>
|
|
</tr>
|
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<tr>
|
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<td><code>circumference</code></td>
|
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<td><code>Number</code></td>
|
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<td><code>2 * Math.PI</code></td>
|
|
<td>Sweep to allow arcs to cover</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>false</code></td>
|
|
<td>If true, will animate scaling the chart from the center outwards.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<h2 id="default-options">Default Options</h2>
|
|
<p>We can also change these default values for each Doughnut type that is created, this object is available at <code>Chart.defaults.doughnut</code>. Pie charts also have a clone of these defaults available to change at <code>Chart.defaults.pie</code>, with the only difference being <code>cutoutPercentage</code> being set to 0.</p>
|
|
<h2 id="data-structure">Data Structure</h2>
|
|
<p>For a pie 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</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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};
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</code></pre>
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