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<td >Qt 5.9</td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-examples.html">Qt Charts Examples</a></td><td >AreaChart Example</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#creating-area-charts">Creating Area Charts</a></li>
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<h1 class="title">AreaChart Example</h1>
<span class="subtitle"></span>
<!-- $$$areachart-description -->
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<p class="centerAlign"><img src="images/examples_areachart.png" alt="" /></p><a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<a name="creating-area-charts"></a>
<h2 id="creating-area-charts">Creating Area Charts</h2>
<p>To create area charts, we need two <a href="qlineseries.html">QLineSeries</a> instances. They are going to define the upper and lower boundary of the area.</p>
<pre class="cpp">
<span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series0 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>();
<span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series1 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>();
</pre>
<p>We add data to both series and use the stream operator.</p>
<pre class="cpp">
<span class="operator">*</span>series0 <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">1</span><span class="operator">,</span> <span class="number">5</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">3</span><span class="operator">,</span> <span class="number">7</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">7</span><span class="operator">,</span> <span class="number">6</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">9</span><span class="operator">,</span> <span class="number">7</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">12</span><span class="operator">,</span> <span class="number">6</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">16</span><span class="operator">,</span> <span class="number">7</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">18</span><span class="operator">,</span> <span class="number">5</span>);
<span class="operator">*</span>series1 <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">1</span><span class="operator">,</span> <span class="number">3</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">3</span><span class="operator">,</span> <span class="number">4</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">7</span><span class="operator">,</span> <span class="number">3</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">8</span><span class="operator">,</span> <span class="number">2</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">12</span><span class="operator">,</span> <span class="number">3</span>)
<span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">16</span><span class="operator">,</span> <span class="number">4</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">18</span><span class="operator">,</span> <span class="number">3</span>);
</pre>
<p>Now we create a <a href="qareaseries.html">QAreaSeries</a> instance using two line series objects. We set the custom gradient fill and width of the outline.</p>
<pre class="cpp">
<span class="type"><a href="qareaseries.html">QAreaSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qareaseries.html">QAreaSeries</a></span>(series0<span class="operator">,</span> series1);
series<span class="operator">-</span><span class="operator">></span>setName(<span class="string">"Batman"</span>);
<span class="type">QPen</span> pen(<span class="number">0x059605</span>);
pen<span class="operator">.</span>setWidth(<span class="number">3</span>);
series<span class="operator">-</span><span class="operator">></span>setPen(pen);
<span class="type">QLinearGradient</span> gradient(<span class="type">QPointF</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> <span class="type">QPointF</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">1</span>));
gradient<span class="operator">.</span>setColorAt(<span class="number">0.0</span><span class="operator">,</span> <span class="number">0x3cc63c</span>);
gradient<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> <span class="number">0x26f626</span>);
gradient<span class="operator">.</span>setCoordinateMode(<span class="type">QGradient</span><span class="operator">::</span>ObjectBoundingMode);
series<span class="operator">-</span><span class="operator">></span>setBrush(gradient);
</pre>
<p>Last we create the <a href="qchartview.html">QChartView</a> instance, set the title, set anti-aliasing, and add the area series. We also create the default axes and specify the ranges on them.</p>
<pre class="cpp">
<span class="type"><a href="qchart.html">QChart</a></span> <span class="operator">*</span>chart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>();
chart<span class="operator">-</span><span class="operator">></span>addSeries(series);
chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Simple areachart example"</span>);
chart<span class="operator">-</span><span class="operator">></span>createDefaultAxes();
chart<span class="operator">-</span><span class="operator">></span>axisX()<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">20</span>);
chart<span class="operator">-</span><span class="operator">></span>axisY()<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">10</span>);
</pre>
<p>The chart is ready to be shown.</p>
<pre class="cpp">
<span class="type"><a href="qchartview.html">QChartView</a></span> <span class="operator">*</span>chartView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchartview.html">QChartView</a></span>(chart);
chartView<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing);
</pre>
<p>Files:</p>
<ul>
<li><a href="qtcharts-areachart-main-cpp.html">areachart/main.cpp</a></li>
<li><a href="qtcharts-areachart-areachart-pro.html">areachart/areachart.pro</a></li>
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