Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.

Using Axes in Qt Quick Applications

We begin with a chart that has a line series and a scatter series with random data. Both series use the same axes.


  ChartView {
      title: "Two Series, Common Axes"
      anchors.fill: parent
      legend.visible: false
      antialiasing: true

      ValueAxis {
          id: axisX
          min: 0
          max: 10
          tickCount: 5
      }

      ValueAxis {
          id: axisY
          min: -0.5
          max: 1.5
      }

      LineSeries {
          id: series1
          axisX: axisX
          axisY: axisY
      }

      ScatterSeries {
          id: series2
          axisX: axisX
          axisY: axisY
      }
  }

  // Add data dynamically to the series
  Component.onCompleted: {
      for (var i = 0; i <= 10; i++) {
          series1.append(i, Math.random());
          series2.append(i, Math.random());
      }
  }

The next example shows a chart with some accurate historical data that makes us to use a DateTimeAxis.


  ChartView {
      title: "Accurate Historical Data"
      anchors.fill: parent
      legend.visible: false
      antialiasing: true

      LineSeries {
          axisX: DateTimeAxis {
              format: "yyyy MMM"
              tickCount: 5
          }
          axisY: ValueAxis {
              min: 0
              max: 150
          }

          // Please note that month in JavaScript months are zero based, so 2 means March
          XYPoint { x: toMsecsSinceEpoch(new Date(1950, 2, 15)); y: 5 }
          XYPoint { x: toMsecsSinceEpoch(new Date(1970, 0, 1)); y: 50 }
          XYPoint { x: toMsecsSinceEpoch(new Date(1987, 12, 31)); y: 102 }
          XYPoint { x: toMsecsSinceEpoch(new Date(1998, 7, 1)); y: 100 }
          XYPoint { x: toMsecsSinceEpoch(new Date(2012, 8, 2)); y: 110 }
      }
  }

  // DateTimeAxis is based on QDateTimes so we must convert our JavaScript dates to
  // milliseconds since epoch to make them match the DateTimeAxis values
  function toMsecsSinceEpoch(date) {
      var msecs = date.getTime();
      return msecs;
  }

And the final example with a chart that uses a CategoryAxis to make the data easier to understand.


  ChartView {
      title: "Numerical Data for Dummies"
      anchors.fill: parent
      legend.visible: false
      antialiasing: true

      LineSeries {
          axisY: CategoryAxis {
              min: 0
              max: 30
              CategoryRange {
                  label: "critical"
                  endValue: 2
              }
              CategoryRange {
                  label: "low"
                  endValue: 4
              }
              CategoryRange {
                  label: "normal"
                  endValue: 7
              }
              CategoryRange {
                  label: "high"
                  endValue: 15
              }
              CategoryRange {
                  label: "extremely high"
                  endValue: 30
              }
          }

          XYPoint { x: 0; y: 4.3 }
          XYPoint { x: 1; y: 4.1 }
          XYPoint { x: 2; y: 4.7 }
          XYPoint { x: 3; y: 3.9 }
          XYPoint { x: 4; y: 5.2 }
      }
  }

Files:

Contents

Qml Axes

Running the Example

Using Axes in Qt Quick Applications