main.qml Example File

qmlf1legends/qml/qmlf1legends/main.qml
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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;
            }
        }
    }
}

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