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<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>
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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="#using-polar-charts-in-qt-quick-applications">Using Polar Charts in Qt Quick Applications</a></li>
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<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>
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