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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 F1 Legends</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-list-models-as-data-sources">Using List Models as Data Sources</a></li>
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<h1 class="title">Qml F1 Legends</h1>
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<p class="centerAlign"><img src="images/examples_qmlf1legends.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="using-list-models-as-data-sources"></a>
<h2 id="using-list-models-as-data-sources">Using List Models as Data Sources</h2>
<p>Let's define an empty <a href="qml-qtcharts-chartview.html">ChartView</a> first:</p>
<pre class="qml">
<span class="type"><a href="qml-qtcharts-chartview.html">ChartView</a></span> {
<span class="name">id</span>: <span class="name">chartView</span>
<span class="name">title</span>: <span class="string">"Driver Speeds, lap 1"</span>
<span class="name">anchors</span>.fill: <span class="name">parent</span>
<span class="name">legend</span>.alignment: <span class="name">Qt</span>.<span class="name">AlignTop</span>
<span class="name">animationOptions</span>: <span class="name">ChartView</span>.<span class="name">SeriesAnimations</span>
<span class="name">antialiasing</span>: <span class="number">true</span>
}
</pre>
<p>Our XmlListModel uses hard-coded test data. In a real application the data source would be a timing system.</p>
<pre class="qml">
<span class="type">XmlListModel</span> {
<span class="comment">// Hard-coded test data</span>
<span class="name">xml</span>: <span class="string">"<results><row><speedTrap>0</speedTrap><driver>Fittipaldi</driver><speed>104.12</speed></row>"</span>
<span class="operator">+</span><span class="string">"<row><speedTrap>0</speedTrap><driver>Stewart</driver><speed>106.12</speed></row>"</span>
<span class="operator">+</span><span class="string">"<row><speedTrap>0</speedTrap><driver>Hunt</driver><speed>106.12</speed></row>"</span>
...
<span class="name">query</span>: <span class="string">"/results/row"</span>
<span class="type">XmlRole</span> { <span class="name">name</span>: <span class="string">"speedTrap"</span>; <span class="name">query</span>: <span class="string">"speedTrap/string()"</span> }
<span class="type">XmlRole</span> { <span class="name">name</span>: <span class="string">"driver"</span>; <span class="name">query</span>: <span class="string">"driver/string()"</span> }
<span class="type">XmlRole</span> { <span class="name">name</span>: <span class="string">"speed"</span>; <span class="name">query</span>: <span class="string">"speed/string()"</span> }
}
<span class="comment">// An example XmlListModel containing F1 legend drivers' speeds at speed traps</span>
<span class="type">SpeedsXml</span> {
<span class="name">id</span>: <span class="name">speedsXml</span>
<span class="name">onStatusChanged</span>: {
<span class="keyword">if</span> (<span class="name">status</span> <span class="operator">==</span> <span class="name">XmlListModel</span>.<span class="name">Ready</span>) {
<span class="name">timer</span>.<span class="name">start</span>();
}
}
}
</pre>
<p>The data is parsed with a timer. The line series representing each driver are created on the fly.</p>
<pre class="qml">
<span class="comment">// A timer to mimic refreshing the data dynamically</span>
<span class="type">Timer</span> {
<span class="name">id</span>: <span class="name">timer</span>
<span class="name">interval</span>: <span class="number">700</span>
<span class="name">repeat</span>: <span class="number">true</span>
<span class="name">triggeredOnStart</span>: <span class="number">true</span>
<span class="name">running</span>: <span class="number">false</span>
<span class="name">onTriggered</span>: {
currentIndex++;
<span class="keyword">if</span> (<span class="name">currentIndex</span> <span class="operator"><</span> <span class="name">speedsXml</span>.<span class="name">count</span>) {
<span class="comment">// Check if there is a series for the data already</span>
<span class="comment">// (we are using driver name to identify series)</span>
var <span class="name">lineSeries</span> = <span class="name">chartView</span>.<span class="name">series</span>(<span class="name">speedsXml</span>.<span class="name">get</span>(<span class="name">currentIndex</span>).<span class="name">driver</span>);
<span class="keyword">if</span> (!<span class="name">lineSeries</span>) {
<span class="name">lineSeries</span> <span class="operator">=</span> <span class="name">chartView</span>.<span class="name">createSeries</span>(<span class="name">ChartView</span>.<span class="name">SeriesTypeLine</span>,
<span class="name">speedsXml</span>.<span class="name">get</span>(<span class="name">currentIndex</span>).<span class="name">driver</span>);
<span class="name">chartView</span>.<span class="name">axisY</span>().<span class="name">min</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="name">chartView</span>.<span class="name">axisY</span>().<span class="name">max</span> <span class="operator">=</span> <span class="number">250</span>;
<span class="name">chartView</span>.<span class="name">axisY</span>().<span class="name">tickCount</span> <span class="operator">=</span> <span class="number">6</span>;
<span class="name">chartView</span>.<span class="name">axisY</span>().<span class="name">titleText</span> <span class="operator">=</span> <span class="string">"speed (kph)"</span>;
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">titleText</span> <span class="operator">=</span> <span class="string">"speed trap"</span>;
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">labelFormat</span> <span class="operator">=</span> <span class="string">"%.0f"</span>;
}
<span class="name">lineSeries</span>.<span class="name">append</span>(<span class="name">speedsXml</span>.<span class="name">get</span>(<span class="name">currentIndex</span>).<span class="name">speedTrap</span>,
<span class="name">speedsXml</span>.<span class="name">get</span>(<span class="name">currentIndex</span>).<span class="name">speed</span>);
<span class="keyword">if</span> (<span class="name">speedsXml</span>.<span class="name">get</span>(<span class="name">currentIndex</span>).<span class="name">speedTrap</span> <span class="operator">></span> <span class="number">3</span>) {
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">max</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">speedsXml</span>.<span class="name">get</span>(<span class="name">currentIndex</span>).<span class="name">speedTrap</span>) <span class="operator">+</span> <span class="number">1</span>;
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">min</span> <span class="operator">=</span> <span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">max</span> <span class="operator">-</span> <span class="number">5</span>;
} <span class="keyword">else</span> {
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">max</span> <span class="operator">=</span> <span class="number">5</span>;
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">min</span> <span class="operator">=</span> <span class="number">0</span>;
}
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">tickCount</span> <span class="operator">=</span> <span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">max</span> <span class="operator">-</span> <span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">min</span> <span class="operator">+</span> <span class="number">1</span>;
} <span class="keyword">else</span> {
<span class="comment">// No more data, change x-axis range to show all the data</span>
<span class="name">timer</span>.<span class="name">stop</span>();
<span class="name">chartView</span>.<span class="name">animationOptions</span> <span class="operator">=</span> <span class="name">ChartView</span>.<span class="name">AllAnimations</span>;
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">min</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="name">chartView</span>.<span class="name">axisX</span>().<span class="name">max</span> <span class="operator">=</span> <span class="name">speedsXml</span>.<span class="name">get</span>(<span class="name">currentIndex</span> <span class="operator">-</span> <span class="number">1</span>).<span class="name">speedTrap</span>;
}
}
}
</pre>
<p>Files:</p>
<ul>
<li><a href="qtcharts-qmlf1legends-qml-qmlf1legends-speedsxml-qml.html">qmlf1legends/qml/qmlf1legends/SpeedsXml.qml</a></li>
<li><a href="qtcharts-qmlf1legends-qml-qmlf1legends-main-qml.html">qmlf1legends/qml/qmlf1legends/main.qml</a></li>
<li><a href="qtcharts-qmlf1legends-main-cpp.html">qmlf1legends/main.cpp</a></li>
<li><a href="qtcharts-qmlf1legends-qmlf1legends-pro.html">qmlf1legends/qmlf1legends.pro</a></li>
<li><a href="qtcharts-qmlf1legends-resources-qrc.html">qmlf1legends/resources.qrc</a></li>
</ul>
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distrib
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Mageia
>
6
>
x86_64
>
media
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core-updates
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by-pkgid
>
19952c5e751bf7e3108c3c59625b0f35
>
files
>
442
