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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 >LineChart 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-line-charts">Creating Line Charts</a></li>
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<h1 class="title">LineChart Example</h1>
<span class="subtitle"></span>
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<div class="descr"> <a name="details"></a>
<p class="centerAlign"><img src="images/examples_linechart.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-line-charts"></a>
<h2 id="creating-line-charts">Creating Line Charts</h2>
<p>To create a line chart, a <a href="qlineseries.html">QLineSeries</a> instance is needed. Let's create one.</p>
<pre class="cpp">
<span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>();
</pre>
<p>Then we add data to the series. We can use the append() member function or use the stream operator.</p>
<pre class="cpp">
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">0</span><span class="operator">,</span> <span class="number">6</span>);
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">2</span><span class="operator">,</span> <span class="number">4</span>);
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">3</span><span class="operator">,</span> <span class="number">8</span>);
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">7</span><span class="operator">,</span> <span class="number">4</span>);
series<span class="operator">-</span><span class="operator">></span>append(<span class="number">10</span><span class="operator">,</span> <span class="number">5</span>);
<span class="operator">*</span>series <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">11</span><span class="operator">,</span> <span class="number">1</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(<span class="number">13</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">17</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">18</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">20</span><span class="operator">,</span> <span class="number">2</span>);
</pre>
<p>To present the data on the chart we need a <a href="qchart.html">QChart</a> instance. We add the series to it, create the default axes, and set the title of the chart.</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>legend()<span class="operator">-</span><span class="operator">></span>hide();
chart<span class="operator">-</span><span class="operator">></span>addSeries(series);
chart<span class="operator">-</span><span class="operator">></span>createDefaultAxes();
chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Simple line chart example"</span>);
</pre>
<p>Then we create a <a href="qchartview.html">QChartView</a> object with <a href="qchart.html">QChart</a> as a parameter. This way we don't need to create a QGraphicsView scene ourselves. We also set the Antialiasing on to have the rendered lines look nicer.</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>The chart is ready to be shown.</p>
<pre class="cpp">
<span class="type">QMainWindow</span> window;
window<span class="operator">.</span>setCentralWidget(chartView);
window<span class="operator">.</span>resize(<span class="number">400</span><span class="operator">,</span> <span class="number">300</span>);
window<span class="operator">.</span>show();
</pre>
<p>Files:</p>
<ul>
<li><a href="qtcharts-linechart-main-cpp.html">linechart/main.cpp</a></li>
<li><a href="qtcharts-linechart-linechart-pro.html">linechart/linechart.pro</a></li>
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