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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 >ScatterChart 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-scatter-charts">Creating Scatter Charts</a></li>
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<h1 class="title">ScatterChart Example</h1>
<span class="subtitle"></span>
<!-- $$$scatterchart-description -->
<div class="descr"> <a name="details"></a>
<p class="centerAlign"><img src="images/examples_scatterchart.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-scatter-charts"></a>
<h2 id="creating-scatter-charts">Creating Scatter Charts</h2>
<p>To create scatter charts, a <a href="qscatterseries.html">QScatterSeries</a> instance is needed. Here we create a scatter series instance, and set the type and width of outline for the scatter points.</p>
<pre class="cpp">
<span class="type"><a href="qscatterseries.html">QScatterSeries</a></span> <span class="operator">*</span>series0 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscatterseries.html">QScatterSeries</a></span>();
series0<span class="operator">-</span><span class="operator">></span>setName(<span class="string">"scatter1"</span>);
series0<span class="operator">-</span><span class="operator">></span>setMarkerShape(<span class="type"><a href="qscatterseries.html">QScatterSeries</a></span><span class="operator">::</span>MarkerShapeCircle);
series0<span class="operator">-</span><span class="operator">></span>setMarkerSize(<span class="number">15.0</span>);
<span class="type"><a href="qscatterseries.html">QScatterSeries</a></span> <span class="operator">*</span>series1 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscatterseries.html">QScatterSeries</a></span>();
series1<span class="operator">-</span><span class="operator">></span>setName(<span class="string">"scatter2"</span>);
series1<span class="operator">-</span><span class="operator">></span>setMarkerShape(<span class="type"><a href="qscatterseries.html">QScatterSeries</a></span><span class="operator">::</span>MarkerShapeRectangle);
series1<span class="operator">-</span><span class="operator">></span>setMarkerSize(<span class="number">20.0</span>);
<span class="type"><a href="qscatterseries.html">QScatterSeries</a></span> <span class="operator">*</span>series2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscatterseries.html">QScatterSeries</a></span>();
series2<span class="operator">-</span><span class="operator">></span>setName(<span class="string">"scatter3"</span>);
series2<span class="operator">-</span><span class="operator">></span>setMarkerShape(<span class="type"><a href="qscatterseries.html">QScatterSeries</a></span><span class="operator">::</span>MarkerShapeRectangle);
series2<span class="operator">-</span><span class="operator">></span>setMarkerSize(<span class="number">30.0</span>);
</pre>
<p>We add the data to be shown. We can use the append() member function or use the stream operator.</p>
<pre class="cpp">
series0<span class="operator">-</span><span class="operator">></span>append(<span class="number">0</span><span class="operator">,</span> <span class="number">6</span>);
series0<span class="operator">-</span><span class="operator">></span>append(<span class="number">2</span><span class="operator">,</span> <span class="number">4</span>);
series0<span class="operator">-</span><span class="operator">></span>append(<span class="number">3</span><span class="operator">,</span> <span class="number">8</span>);
series0<span class="operator">-</span><span class="operator">></span>append(<span class="number">7</span><span class="operator">,</span> <span class="number">4</span>);
series0<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>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">1</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">3</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">8</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">10</span><span class="operator">,</span> <span class="number">2</span>);
<span class="operator">*</span>series2 <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">4</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">6</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">9</span><span class="operator">,</span> <span class="number">5</span>);
</pre>
<p>We can define the brush of the scatter series to be an image. Here the image is a star created using QPainterPath.</p>
<pre class="cpp">
<span class="type">QPainterPath</span> starPath;
starPath<span class="operator">.</span>moveTo(<span class="number">28</span><span class="operator">,</span> <span class="number">15</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator"><</span> <span class="number">5</span>; <span class="operator">+</span><span class="operator">+</span>i) {
starPath<span class="operator">.</span>lineTo(<span class="number">14</span> <span class="operator">+</span> <span class="number">14</span> <span class="operator">*</span> qCos(<span class="number">0.8</span> <span class="operator">*</span> i <span class="operator">*</span> Pi)<span class="operator">,</span>
<span class="number">15</span> <span class="operator">+</span> <span class="number">14</span> <span class="operator">*</span> qSin(<span class="number">0.8</span> <span class="operator">*</span> i <span class="operator">*</span> Pi));
}
starPath<span class="operator">.</span>closeSubpath();
<span class="type">QImage</span> star(<span class="number">30</span><span class="operator">,</span> <span class="number">30</span><span class="operator">,</span> <span class="type">QImage</span><span class="operator">::</span>Format_ARGB32);
star<span class="operator">.</span>fill(<span class="type">Qt</span><span class="operator">::</span>transparent);
<span class="type">QPainter</span> painter(<span class="operator">&</span>star);
painter<span class="operator">.</span>setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing);
painter<span class="operator">.</span>setPen(<span class="type">QRgb</span>(<span class="number">0xf6a625</span>));
painter<span class="operator">.</span>setBrush(painter<span class="operator">.</span>pen()<span class="operator">.</span>color());
painter<span class="operator">.</span>drawPath(starPath);
series2<span class="operator">-</span><span class="operator">></span>setBrush(star);
series2<span class="operator">-</span><span class="operator">></span>setPen(<span class="type">QColor</span>(<span class="type">Qt</span><span class="operator">::</span>transparent));
</pre>
<p>In the end we enable anti-aliasing, set the chart title, and add the scatter series onto the chart. We also disable drop shadow, because it would not look good on an application with only chart view shown.</p>
<pre class="cpp">
setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing);
chart()<span class="operator">-</span><span class="operator">></span>addSeries(series0);
chart()<span class="operator">-</span><span class="operator">></span>addSeries(series1);
chart()<span class="operator">-</span><span class="operator">></span>addSeries(series2);
chart()<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Simple scatterchart example"</span>);
chart()<span class="operator">-</span><span class="operator">></span>createDefaultAxes();
chart()<span class="operator">-</span><span class="operator">></span>setDropShadowEnabled(<span class="keyword">false</span>);
</pre>
<p>We can also use the scatter points as legend markers.</p>
<pre class="cpp">
chart()<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>setMarkerShape(<span class="type"><a href="qlegend.html">QLegend</a></span><span class="operator">::</span>MarkerShapeFromSeries);
</pre>
<p>The chart is ready to be shown.</p>
<pre class="cpp">
ChartView <span class="operator">*</span>chartView <span class="operator">=</span> <span class="keyword">new</span> ChartView();
<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-scatterchart-chartview-cpp.html">scatterchart/chartview.cpp</a></li>
<li><a href="qtcharts-scatterchart-chartview-h.html">scatterchart/chartview.h</a></li>
<li><a href="qtcharts-scatterchart-main-cpp.html">scatterchart/main.cpp</a></li>
<li><a href="qtcharts-scatterchart-scatterchart-pro.html">scatterchart/scatterchart.pro</a></li>
</ul>
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