<?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 5.12.6</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 5.12</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"><a href="qtcharts-index.html">Qt Charts | Commercial or GPLv3</a></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> <!-- $$$qmlpolarchart-brief --> <p>This is a demonstration on how to use a polar chart in your QML application.</p> <!-- @@@qmlpolarchart --> <!-- $$$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"> PolarChartView { title: "Two Series, Common Axes" anchors.fill: parent legend.visible: false antialiasing: true ValueAxis { id: axisAngular min: 0 max: 20 tickCount: 9 } ValueAxis { id: axisRadial min: -0.5 max: 1.5 } SplineSeries { id: series1 axisAngular: axisAngular axisRadial: axisRadial pointsVisible: true } ScatterSeries { id: series2 axisAngular: axisAngular axisRadial: axisRadial markerSize: 10 } } // Add data dynamically to the series Component.onCompleted: { for (var i = 0; i <= 20; i++) { series1.append(i, Math.random()); series2.append(i, Math.random()); } } </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"> PolarChartView { title: "Historical Area Series" anchors.fill: parent legend.visible: false antialiasing: true DateTimeAxis { id: axis1 format: "yyyy MMM" tickCount: 13 } ValueAxis { id: axis2 } LineSeries { id: lowerLine axisAngular: axis1 axisRadial: axis2 // Please note that month in JavaScript months are zero based, so 2 means March XYPoint { x: toMsecsSinceEpoch(new Date(1950, 0, 1)); y: 15 } XYPoint { x: toMsecsSinceEpoch(new Date(1962, 4, 1)); y: 35 } XYPoint { x: toMsecsSinceEpoch(new Date(1970, 0, 1)); y: 50 } XYPoint { x: toMsecsSinceEpoch(new Date(1978, 2, 1)); y: 75 } XYPoint { x: toMsecsSinceEpoch(new Date(1987, 11, 1)); y: 102 } XYPoint { x: toMsecsSinceEpoch(new Date(1992, 1, 1)); y: 132 } XYPoint { x: toMsecsSinceEpoch(new Date(1998, 7, 1)); y: 100 } XYPoint { x: toMsecsSinceEpoch(new Date(2002, 4, 1)); y: 120 } XYPoint { x: toMsecsSinceEpoch(new Date(2012, 8, 1)); y: 140 } XYPoint { x: toMsecsSinceEpoch(new Date(2013, 5, 1)); y: 150 } } LineSeries { id: upperLine axisAngular: axis1 axisRadial: axis2 // Please note that month in JavaScript months are zero based, so 2 means March XYPoint { x: toMsecsSinceEpoch(new Date(1950, 0, 1)); y: 30 } XYPoint { x: toMsecsSinceEpoch(new Date(1962, 4, 1)); y: 55 } XYPoint { x: toMsecsSinceEpoch(new Date(1970, 0, 1)); y: 80 } XYPoint { x: toMsecsSinceEpoch(new Date(1978, 2, 1)); y: 105 } XYPoint { x: toMsecsSinceEpoch(new Date(1987, 11, 1)); y: 125 } XYPoint { x: toMsecsSinceEpoch(new Date(1992, 1, 1)); y: 160 } XYPoint { x: toMsecsSinceEpoch(new Date(1998, 7, 1)); y: 140 } XYPoint { x: toMsecsSinceEpoch(new Date(2002, 4, 1)); y: 140 } XYPoint { x: toMsecsSinceEpoch(new Date(2012, 8, 1)); y: 170 } XYPoint { x: toMsecsSinceEpoch(new Date(2013, 5, 1)); y: 200 } } AreaSeries { axisAngular: axis1 axisRadial: axis2 lowerSeries: lowerLine upperSeries: upperLine } } // DateTimeAxis is based on QDateTimes so we must convert our JavaScript dates to // milliseconds since epoch to make them match the DateTimeAxis values function toMsecsSinceEpoch(date) { var msecs = date.getTime(); return msecs; } </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"> PolarChartView { title: "Numerical Data for Dummies" anchors.fill: parent legend.visible: false antialiasing: true LineSeries { axisRadial: CategoryAxis { min: 0 max: 30 CategoryRange { label: "critical" endValue: 2 } CategoryRange { label: "low" endValue: 7 } CategoryRange { label: "normal" endValue: 12 } CategoryRange { label: "high" endValue: 18 } CategoryRange { label: "extremely high" endValue: 30 } } axisAngular: ValueAxis { tickCount: 13 } XYPoint { x: 0; y: 4.3 } XYPoint { x: 1; y: 4.1 } XYPoint { x: 2; y: 4.7 } XYPoint { x: 3; y: 3.9 } XYPoint { x: 4; y: 5.2 } XYPoint { x: 5; y: 5.3 } XYPoint { x: 6; y: 6.1 } XYPoint { x: 7; y: 7.7 } XYPoint { x: 8; y: 12.9 } XYPoint { x: 9; y: 19.2 } } } </pre> <p>Files:</p> <ul> <li><a href="qtcharts-qmlpolarchart-main-cpp.html">qmlpolarchart/main.cpp</a></li> <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-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> 2019 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>