main.qml Example File

qmlf1legends/qml/qmlf1legends/main.qml
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 ** Contact: https://www.qt.io/licensing/
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 ** This file is part of the Qt Charts module of the Qt Toolkit.
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 import QtQuick 2.0
 import QtCharts 2.0
 import QtQuick.XmlListModel 2.0

 Item {
     width: 400
     height: 300
     property int currentIndex: -1

     ChartView {
         id: chartView
         title: "Driver Speeds, lap 1"
         anchors.fill: parent
         legend.alignment: Qt.AlignTop
         animationOptions: ChartView.SeriesAnimations
         antialiasing: true
     }

     // An example XmlListModel containing F1 legend drivers' speeds at speed traps
     SpeedsXml {
         id: speedsXml
         onStatusChanged: {
             if (status == XmlListModel.Ready) {
                 timer.start();
             }
         }
     }

     // A timer to mimic refreshing the data dynamically
     Timer {
         id: timer
         interval: 700
         repeat: true
         triggeredOnStart: true
         running: false
         onTriggered: {
             currentIndex++;
             if (currentIndex < speedsXml.count) {
                 // Check if there is a series for the data already
                 // (we are using driver name to identify series)
                 var lineSeries = chartView.series(speedsXml.get(currentIndex).driver);
                 if (!lineSeries) {
                     lineSeries = chartView.createSeries(ChartView.SeriesTypeLine,
                                                         speedsXml.get(currentIndex).driver);
                     chartView.axisY().min = 0;
                     chartView.axisY().max = 250;
                     chartView.axisY().tickCount = 6;
                     chartView.axisY().titleText = "speed (kph)";
                     chartView.axisX().titleText = "speed trap";
                     chartView.axisX().labelFormat = "%.0f";
                 }
                 lineSeries.append(speedsXml.get(currentIndex).speedTrap,
                                   speedsXml.get(currentIndex).speed);

                 if (speedsXml.get(currentIndex).speedTrap > 3) {
                     chartView.axisX().max = Number(speedsXml.get(currentIndex).speedTrap) + 1;
                     chartView.axisX().min = chartView.axisX().max - 5;
                 } else {
                     chartView.axisX().max = 5;
                     chartView.axisX().min = 0;
                 }
                 chartView.axisX().tickCount = chartView.axisX().max - chartView.axisX().min + 1;
             } else {
                 // No more data, change x-axis range to show all the data
                 timer.stop();
                 chartView.animationOptions = ChartView.AllAnimations;
                 chartView.axisX().min = 0;
                 chartView.axisX().max = speedsXml.get(currentIndex - 1).speedTrap;
             }
         }
     }
 }