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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 >StackedBarChart 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-stacked-bar-charts">Creating Stacked Bar Charts</a></li>
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<h1 class="title">StackedBarChart Example</h1>
<span class="subtitle"></span>
<!-- $$$stackedbarchart-description -->
<div class="descr"> <a name="details"></a>
<p>The stacked bar chart shows the data in sets as bars stacked on top of each other. The stacking is done per category. The example shows how to create a simple stacked bar chart. Stacked bar chart shows the data in sets as bars that are stacked on top of each other. The stacking is done per category. Creating a stacked bar chart is just like creating a regular <a href="qtcharts-barchart-example.html">bar chart</a>, except that for a stacked bar chart, we use the <a href="qstackedbarseries.html">QStackedBarSeries</a> API instead of <a href="qbarseries.html">QBarSeries</a>.</p>
<p class="centerAlign"><img src="images/examples_stackedbarchart.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-stacked-bar-charts"></a>
<h2 id="creating-stacked-bar-charts">Creating Stacked Bar Charts</h2>
<p>The barsets are used in same way in all barcharts. To illustrate the difference between various barcharts, we use same data in all examples. Data, which the barchart visualizes, is defined by the <a href="qbarset.html">QBarSet</a> instances. Here we create the sets and append data to them. The data is appended here with << operator. Alternatively the append method could be used.</p>
<pre class="cpp">
<span class="type"><a href="qbarset.html">QBarSet</a></span> <span class="operator">*</span>set0 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbarset.html">QBarSet</a></span>(<span class="string">"Jane"</span>);
<span class="type"><a href="qbarset.html">QBarSet</a></span> <span class="operator">*</span>set1 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbarset.html">QBarSet</a></span>(<span class="string">"John"</span>);
<span class="type"><a href="qbarset.html">QBarSet</a></span> <span class="operator">*</span>set2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbarset.html">QBarSet</a></span>(<span class="string">"Axel"</span>);
<span class="type"><a href="qbarset.html">QBarSet</a></span> <span class="operator">*</span>set3 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbarset.html">QBarSet</a></span>(<span class="string">"Mary"</span>);
<span class="type"><a href="qbarset.html">QBarSet</a></span> <span class="operator">*</span>set4 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbarset.html">QBarSet</a></span>(<span class="string">"Samantha"</span>);
<span class="operator">*</span>set0 <span class="operator"><</span><span class="operator"><</span> <span class="number">1</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">2</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">3</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">4</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">5</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">6</span>;
<span class="operator">*</span>set1 <span class="operator"><</span><span class="operator"><</span> <span class="number">5</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">0</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">0</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">4</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">0</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">7</span>;
<span class="operator">*</span>set2 <span class="operator"><</span><span class="operator"><</span> <span class="number">3</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">5</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">8</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">13</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">8</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">5</span>;
<span class="operator">*</span>set3 <span class="operator"><</span><span class="operator"><</span> <span class="number">5</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">6</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">7</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">3</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">4</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">5</span>;
<span class="operator">*</span>set4 <span class="operator"><</span><span class="operator"><</span> <span class="number">9</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">7</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">5</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">3</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">1</span> <span class="operator"><</span><span class="operator"><</span> <span class="number">2</span>;
</pre>
<p>We create the series and append the barsets to it. The series takes ownership of the barsets. The series groups the data from sets to categories. The first values of each set are grouped together in the first category, the second values in the second category etc.</p>
<pre class="cpp">
<span class="type"><a href="qstackedbarseries.html">QStackedBarSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstackedbarseries.html">QStackedBarSeries</a></span>();
series<span class="operator">-</span><span class="operator">></span>append(set0);
series<span class="operator">-</span><span class="operator">></span>append(set1);
series<span class="operator">-</span><span class="operator">></span>append(set2);
series<span class="operator">-</span><span class="operator">></span>append(set3);
series<span class="operator">-</span><span class="operator">></span>append(set4);
</pre>
<p>Here we create the chart object and add the series to it. We set the title for the chart with setTitle, and then turn on animations of the series by calling setAnimationOptions(<a href="qchart.html#AnimationOption-enum">QChart::SeriesAnimations</a>).</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 stackedbarchart example"</span>);
chart<span class="operator">-</span><span class="operator">></span>setAnimationOptions(<span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>SeriesAnimations);
</pre>
<p>To have categories displayed on the axis, we need to create a <a href="qbarcategoryaxis.html">QBarCategoryAxis</a>. Here we create a category axis with list of categories and set it to be the x-axis of the chart. The chart takes ownership of the axis. For the y-axis we use default axis, which is created and scaled to series data by calling createDefaultAxes of the chart. Note that the call for createDefaultAxes must be before we set the category axis. Otherwise the default axis will override the category axis.</p>
<pre class="cpp">
<span class="type">QStringList</span> categories;
categories <span class="operator"><</span><span class="operator"><</span> <span class="string">"Jan"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"Feb"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"Mar"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"Apr"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"May"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"Jun"</span>;
<span class="type"><a href="qbarcategoryaxis.html">QBarCategoryAxis</a></span> <span class="operator">*</span>axis <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbarcategoryaxis.html">QBarCategoryAxis</a></span>();
axis<span class="operator">-</span><span class="operator">></span>append(categories);
chart<span class="operator">-</span><span class="operator">></span>createDefaultAxes();
chart<span class="operator">-</span><span class="operator">></span>setAxisX(axis<span class="operator">,</span> series);
</pre>
<p>We also want to show the legend. To do so, we get the legend pointer from the chart and set it to visible. We also place the legend to the bottom of the chart by setting its alignment to Qt::AlignBottom.</p>
<pre class="cpp">
chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">true</span>);
chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type">Qt</span><span class="operator">::</span>AlignBottom);
</pre>
<p>Finally, we add the chart onto a view. We also turn on the antialiasing for the chartView.</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. We set the chart to be the central widget of the window. We also set the size for the chart window and show it.</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">420</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-stackedbarchart-main-cpp.html">stackedbarchart/main.cpp</a></li>
<li><a href="qtcharts-stackedbarchart-stackedbarchart-pro.html">stackedbarchart/stackedbarchart.pro</a></li>
</ul>
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<!-- @@@stackedbarchart -->
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x86_64
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media
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core-updates
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19952c5e751bf7e3108c3c59625b0f35
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