main.qml Example File

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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;
              }
          }
      }
  }