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<?xml version="1.0" encoding="UTF-8"?>
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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 >Qml Polar Chart</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#using-polar-charts-in-qt-quick-applications">Using Polar Charts in Qt Quick Applications</a></li>
</ul>
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<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">Qml Polar Chart</h1>
<span class="subtitle"></span>
<!-- $$$qmlpolarchart-description -->
<div class="descr"> <a name="details"></a>
<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="using-polar-charts-in-qt-quick-applications"></a>
<h2 id="using-polar-charts-in-qt-quick-applications">Using Polar Charts in Qt Quick Applications</h2>
<p>We begin with a chart that has a spline series and a scatter series with random data. Both series use the same axes.</p>
<p class="centerAlign"><img src="images/examples_qmlpolarchart1.png" alt="" /></p><pre class="qml">

  <span class="type"><a href="qml-qtcharts-polarchartview.html">PolarChartView</a></span> {
      <span class="name">title</span>: <span class="string">&quot;Two Series, Common Axes&quot;</span>
      <span class="name">anchors</span>.fill: <span class="name">parent</span>
      <span class="name">legend</span>.visible: <span class="number">false</span>
      <span class="name">antialiasing</span>: <span class="number">true</span>

      <span class="type"><a href="qml-qtcharts-valueaxis.html">ValueAxis</a></span> {
          <span class="name">id</span>: <span class="name">axisAngular</span>
          <span class="name">min</span>: <span class="number">0</span>
          <span class="name">max</span>: <span class="number">20</span>
          <span class="name">tickCount</span>: <span class="number">9</span>
      }

      <span class="type"><a href="qml-qtcharts-valueaxis.html">ValueAxis</a></span> {
          <span class="name">id</span>: <span class="name">axisRadial</span>
          <span class="name">min</span>: -<span class="number">0.5</span>
          <span class="name">max</span>: <span class="number">1.5</span>
      }

      <span class="type"><a href="qml-qtcharts-splineseries.html">SplineSeries</a></span> {
          <span class="name">id</span>: <span class="name">series1</span>
          <span class="name">axisAngular</span>: <span class="name">axisAngular</span>
          <span class="name">axisRadial</span>: <span class="name">axisRadial</span>
          <span class="name">pointsVisible</span>: <span class="number">true</span>
      }

      <span class="type"><a href="qml-qtcharts-scatterseries.html">ScatterSeries</a></span> {
          <span class="name">id</span>: <span class="name">series2</span>
          <span class="name">axisAngular</span>: <span class="name">axisAngular</span>
          <span class="name">axisRadial</span>: <span class="name">axisRadial</span>
          <span class="name">markerSize</span>: <span class="number">10</span>
      }
  }

  <span class="comment">// Add data dynamically to the series</span>
  <span class="name">Component</span>.onCompleted: {
      <span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span> = <span class="number">0</span>; <span class="name">i</span> <span class="operator">&lt;=</span> <span class="number">20</span>; i++) {
          <span class="name">series1</span>.<span class="name">append</span>(<span class="name">i</span>, <span class="name">Math</span>.<span class="name">random</span>());
          <span class="name">series2</span>.<span class="name">append</span>(<span class="name">i</span>, <span class="name">Math</span>.<span class="name">random</span>());
      }
  }

</pre>
<p>The next example shows a chart with some accurate historical data for which we need to use a <a href="qml-qtcharts-datetimeaxis.html">DateTimeAxis</a> and a <a href="qml-qtcharts-areaseries.html">AreaSeries</a>.</p>
<p class="centerAlign"><img src="images/examples_qmlpolarchart2.png" alt="" /></p><pre class="qml">

  <span class="type"><a href="qml-qtcharts-polarchartview.html">PolarChartView</a></span> {
      <span class="name">title</span>: <span class="string">&quot;Historical Area Series&quot;</span>
      <span class="name">anchors</span>.fill: <span class="name">parent</span>
      <span class="name">legend</span>.visible: <span class="number">false</span>
      <span class="name">antialiasing</span>: <span class="number">true</span>

      <span class="type"><a href="qml-qtcharts-datetimeaxis.html">DateTimeAxis</a></span> {
          <span class="name">id</span>: <span class="name">axis1</span>
          <span class="name">format</span>: <span class="string">&quot;yyyy MMM&quot;</span>
          <span class="name">tickCount</span>: <span class="number">13</span>
      }
      <span class="type"><a href="qml-qtcharts-valueaxis.html">ValueAxis</a></span> {
          <span class="name">id</span>: <span class="name">axis2</span>
      }
      <span class="type"><a href="qml-qtcharts-lineseries.html">LineSeries</a></span> {
          <span class="name">id</span>: <span class="name">lowerLine</span>
          <span class="name">axisAngular</span>: <span class="name">axis1</span>
          <span class="name">axisRadial</span>: <span class="name">axis2</span>

          <span class="comment">// Please note that month in JavaScript months are zero based, so 2 means March</span>
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1950</span>, <span class="number">0</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">15</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1962</span>, <span class="number">4</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">35</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1970</span>, <span class="number">0</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">50</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1978</span>, <span class="number">2</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">75</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1987</span>, <span class="number">11</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">102</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1992</span>, <span class="number">1</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">132</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1998</span>, <span class="number">7</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">100</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">2002</span>, <span class="number">4</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">120</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">2012</span>, <span class="number">8</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">140</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">2013</span>, <span class="number">5</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">150</span> }
      }
      <span class="type"><a href="qml-qtcharts-lineseries.html">LineSeries</a></span> {
          <span class="name">id</span>: <span class="name">upperLine</span>
          <span class="name">axisAngular</span>: <span class="name">axis1</span>
          <span class="name">axisRadial</span>: <span class="name">axis2</span>

          <span class="comment">// Please note that month in JavaScript months are zero based, so 2 means March</span>
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1950</span>, <span class="number">0</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">30</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1962</span>, <span class="number">4</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">55</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1970</span>, <span class="number">0</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">80</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1978</span>, <span class="number">2</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">105</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1987</span>, <span class="number">11</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">125</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1992</span>, <span class="number">1</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">160</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">1998</span>, <span class="number">7</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">140</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">2002</span>, <span class="number">4</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">140</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">2012</span>, <span class="number">8</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">170</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="name">toMsecsSinceEpoch</span>(new <span class="name">Date</span>(<span class="number">2013</span>, <span class="number">5</span>, <span class="number">1</span>)); <span class="name">y</span>: <span class="number">200</span> }
      }
      <span class="type"><a href="qml-qtcharts-areaseries.html">AreaSeries</a></span> {
          <span class="name">axisAngular</span>: <span class="name">axis1</span>
          <span class="name">axisRadial</span>: <span class="name">axis2</span>
          <span class="name">lowerSeries</span>: <span class="name">lowerLine</span>
          <span class="name">upperSeries</span>: <span class="name">upperLine</span>
      }
  }
  <span class="comment">// DateTimeAxis is based on QDateTimes so we must convert our JavaScript dates to</span>
  <span class="comment">// milliseconds since epoch to make them match the DateTimeAxis values</span>
  <span class="keyword">function</span> <span class="name">toMsecsSinceEpoch</span>(<span class="name">date</span>) {
      var <span class="name">msecs</span> = <span class="name">date</span>.<span class="name">getTime</span>();
      <span class="keyword">return</span> <span class="name">msecs</span>;
  }

</pre>
<p>And the final example with a chart that uses a <a href="qml-qtcharts-categoryaxis.html">CategoryAxis</a> to make the data easier to understand.</p>
<p class="centerAlign"><img src="images/examples_qmlpolarchart3.png" alt="" /></p><pre class="qml">

  <span class="type"><a href="qml-qtcharts-polarchartview.html">PolarChartView</a></span> {
      <span class="name">title</span>: <span class="string">&quot;Numerical Data for Dummies&quot;</span>
      <span class="name">anchors</span>.fill: <span class="name">parent</span>
      <span class="name">legend</span>.visible: <span class="number">false</span>
      <span class="name">antialiasing</span>: <span class="number">true</span>

      <span class="type"><a href="qml-qtcharts-lineseries.html">LineSeries</a></span> {
          <span class="name">axisRadial</span>: <span class="name">CategoryAxis</span> {
              <span class="name">min</span>: <span class="number">0</span>
              <span class="name">max</span>: <span class="number">30</span>
              <span class="type"><a href="qml-qtcharts-categoryrange.html">CategoryRange</a></span> {
                  <span class="name">label</span>: <span class="string">&quot;critical&quot;</span>
                  <span class="name">endValue</span>: <span class="number">2</span>
              }
              <span class="type"><a href="qml-qtcharts-categoryrange.html">CategoryRange</a></span> {
                  <span class="name">label</span>: <span class="string">&quot;low&quot;</span>
                  <span class="name">endValue</span>: <span class="number">7</span>
              }
              <span class="type"><a href="qml-qtcharts-categoryrange.html">CategoryRange</a></span> {
                  <span class="name">label</span>: <span class="string">&quot;normal&quot;</span>
                  <span class="name">endValue</span>: <span class="number">12</span>
              }
              <span class="type"><a href="qml-qtcharts-categoryrange.html">CategoryRange</a></span> {
                  <span class="name">label</span>: <span class="string">&quot;high&quot;</span>
                  <span class="name">endValue</span>: <span class="number">18</span>
              }
              <span class="type"><a href="qml-qtcharts-categoryrange.html">CategoryRange</a></span> {
                  <span class="name">label</span>: <span class="string">&quot;extremely high&quot;</span>
                  <span class="name">endValue</span>: <span class="number">30</span>
              }
          }

          <span class="name">axisAngular</span>: <span class="name">ValueAxis</span> {
              <span class="name">tickCount</span>: <span class="number">13</span>
          }

          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">4.3</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">1</span>; <span class="name">y</span>: <span class="number">4.1</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">2</span>; <span class="name">y</span>: <span class="number">4.7</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">3</span>; <span class="name">y</span>: <span class="number">3.9</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">4</span>; <span class="name">y</span>: <span class="number">5.2</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">5</span>; <span class="name">y</span>: <span class="number">5.3</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">6</span>; <span class="name">y</span>: <span class="number">6.1</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">7</span>; <span class="name">y</span>: <span class="number">7.7</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">8</span>; <span class="name">y</span>: <span class="number">12.9</span> }
          <span class="type"><a href="qml-qtcharts-xypoint.html">XYPoint</a></span> { <span class="name">x</span>: <span class="number">9</span>; <span class="name">y</span>: <span class="number">19.2</span> }
      }
  }

</pre>
<p>Files:</p>
<ul>
<li><a href="qtcharts-qmlpolarchart-qml-qmlpolarchart-view1-qml.html">qmlpolarchart/qml/qmlpolarchart/View1.qml</a></li>
<li><a href="qtcharts-qmlpolarchart-qml-qmlpolarchart-view2-qml.html">qmlpolarchart/qml/qmlpolarchart/View2.qml</a></li>
<li><a href="qtcharts-qmlpolarchart-qml-qmlpolarchart-view3-qml.html">qmlpolarchart/qml/qmlpolarchart/View3.qml</a></li>
<li><a href="qtcharts-qmlpolarchart-qml-qmlpolarchart-main-qml.html">qmlpolarchart/qml/qmlpolarchart/main.qml</a></li>
<li><a href="qtcharts-qmlpolarchart-main-cpp.html">qmlpolarchart/main.cpp</a></li>
<li><a href="qtcharts-qmlpolarchart-qmlpolarchart-pro.html">qmlpolarchart/qmlpolarchart.pro</a></li>
<li><a href="qtcharts-qmlpolarchart-resources-qrc.html">qmlpolarchart/resources.qrc</a></li>
</ul>
</div>
<!-- @@@qmlpolarchart -->
        </div>
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