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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 >HorizontalBarChart 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-horizontal-bar-charts">Creating Horizontal Bar Charts</a></li>
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<h1 class="title">HorizontalBarChart Example</h1>
<span class="subtitle"></span>
<!-- $$$horizontalbarchart-description -->
<div class="descr"> <a name="details"></a>
<p>QHorizontalBarChart shows the data in sets as separate bars, which are grouped in categories. QHorizontalBarChart works just like QBarChart, except that the bars are drawn horizontally on the chart.</p>
<p class="centerAlign"><img src="images/examples_horizontalbarchart.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-horizontal-bar-charts"></a>
<h2 id="creating-horizontal-bar-charts">Creating Horizontal Bar Charts</h2>
<p>The bar sets are used in the same way in all bar charts. To illustrate the difference between various bar charts, we use the same data in all examples. Data that bar chart visualizes, is defined by <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 also 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 bar sets 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, and so on.</p>
<pre class="cpp">
<span class="type"><a href="qhorizontalbarseries.html">QHorizontalBarSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhorizontalbarseries.html">QHorizontalBarSeries</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 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 horizontal barchart 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 the categories displayed on axis, we need to create a <a href="qbarcategoryaxis.html">QBarCategoryAxis</a>. Here we create a category axis with a list of categories and set it to be the y-axis of the chart. The chart takes ownership of axis. For the x-axis we use the default axis, which is created and scaled to series data by calling createDefaultAxes of the chart. Note that the call for createDefaultAxes must be done 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>axisY <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbarcategoryaxis.html">QBarCategoryAxis</a></span>();
axisY<span class="operator">-</span><span class="operator">></span>append(categories);
chart<span class="operator">-</span><span class="operator">></span>setAxisY(axisY<span class="operator">,</span> series);
<span class="type"><a href="qvalueaxis.html">QValueAxis</a></span> <span class="operator">*</span>axisX <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span>();
chart<span class="operator">-</span><span class="operator">></span>setAxisX(axisX<span class="operator">,</span> series);
axisX<span class="operator">-</span><span class="operator">></span>applyNiceNumbers();
</pre>
<p>We also want to show the legend. To do so, we get the legend pointer from 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-horizontalbarchart-main-cpp.html">horizontalbarchart/main.cpp</a></li>
<li><a href="qtcharts-horizontalbarchart-horizontalbarchart-pro.html">horizontalbarchart/horizontalbarchart.pro</a></li>
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<!-- @@@horizontalbarchart -->
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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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