main.qml Example File | Qt Charts 5.12.10

- Qt 5.12
- Qt Charts
- Qml F1 Legends
- main.qml Example File
- Qt Charts | Commercial or GPLv3

# main.qml Example File

qmlf1legends/qml/qmlf1legends/main.qml

     /****************************************************************************
     **
     ** Copyright (C) 2016 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the Qt Charts module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:GPL$
     ** Commercial License Usage
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     ** accordance with the commercial license agreement provided with the
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     ** Alternatively, this file may be used under the terms of the GNU
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     ** the Free Software Foundation and appearing in the file LICENSE.GPL3
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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;
                 }
             }
         }
     }