<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- examples-qmlpolarchart.qdoc --> <title>Qml Polar Chart | Qt Charts 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <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> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <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> </div> <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">"Two Series, Common Axes"</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"><=</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">"Historical Area Series"</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">"yyyy MMM"</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">"Numerical Data for Dummies"</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">"critical"</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">"low"</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">"normal"</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">"high"</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">"extremely high"</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> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>