OrientationSensor.ReadingChanged 事件

定義

命名空間:

Windows.Devices.Sensors

每次方向感應器報告新的感應器讀數時發生。

// Register
event_token ReadingChanged(TypedEventHandler<OrientationSensor, OrientationSensorReadingChangedEventArgs const&> const& handler) const;

// Revoke with event_token
void ReadingChanged(event_token const* cookie) const;

// Revoke with event_revoker
OrientationSensor::ReadingChanged_revoker ReadingChanged(auto_revoke_t, TypedEventHandler<OrientationSensor, OrientationSensorReadingChangedEventArgs const&> const& handler) const;

public event TypedEventHandler<OrientationSensor,OrientationSensorReadingChangedEventArgs> ReadingChanged;

function onReadingChanged(eventArgs) { /* Your code */ }
orientationSensor.addEventListener("readingchanged", onReadingChanged);
orientationSensor.removeEventListener("readingchanged", onReadingChanged);
- or -
orientationSensor.onreadingchanged = onReadingChanged;

Public Custom Event ReadingChanged As TypedEventHandler(Of OrientationSensor, OrientationSensorReadingChangedEventArgs) 

事件類型

TypedEventHandler<OrientationSensor,OrientationSensorReadingChangedEventArgs>

範例

下列範例示範如何使用 C# 和 XAML 建置的 UWP 應用程式註冊其 ReadingChanged 事件處理常式。

private void ScenarioEnable(object sender, RoutedEventArgs e)
{
    if (_sensor != null)
    {
        // Establish the report interval
        _sensor.ReportInterval = _desiredReportInterval;

        Window.Current.VisibilityChanged += new WindowVisibilityChangedEventHandler(VisibilityChanged);
        _sensor.ReadingChanged += new TypedEventHandler<OrientationSensor, OrientationSensorReadingChangedEventArgs>(ReadingChanged);

        ScenarioEnableButton.IsEnabled = false;
        ScenarioDisableButton.IsEnabled = true;
    }
    else
    {
        rootPage.NotifyUser("No orientation sensor found", NotifyType.StatusMessage);
    }
}

下列範例顯示 ReadingChanged 事件處理常式。

async private void ReadingChanged(object sender, OrientationSensorReadingChangedEventArgs e)
{
    await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
    {
        OrientationSensorReading reading = e.Reading;

        // Quaternion values
        SensorQuaternion quaternion = reading.Quaternion;   // get a reference to the object to avoid re-creating it for each access
        ScenarioOutput_X.Text = String.Format("{0,8:0.00000}", quaternion.X);
        ScenarioOutput_Y.Text = String.Format("{0,8:0.00000}", quaternion.Y);
        ScenarioOutput_Z.Text = String.Format("{0,8:0.00000}", quaternion.Z);
        ScenarioOutput_W.Text = String.Format("{0,8:0.00000}", quaternion.W);

        // Rotation Matrix values
        SensorRotationMatrix rotationMatrix = reading.RotationMatrix;
        ScenarioOutput_M11.Text = String.Format("{0,8:0.00000}", rotationMatrix.M11);
        ScenarioOutput_M12.Text = String.Format("{0,8:0.00000}", rotationMatrix.M12);
        ScenarioOutput_M13.Text = String.Format("{0,8:0.00000}", rotationMatrix.M13);
        ScenarioOutput_M21.Text = String.Format("{0,8:0.00000}", rotationMatrix.M21);
        ScenarioOutput_M22.Text = String.Format("{0,8:0.00000}", rotationMatrix.M22);
        ScenarioOutput_M23.Text = String.Format("{0,8:0.00000}", rotationMatrix.M23);
        ScenarioOutput_M31.Text = String.Format("{0,8:0.00000}", rotationMatrix.M31);
        ScenarioOutput_M32.Text = String.Format("{0,8:0.00000}", rotationMatrix.M32);
        ScenarioOutput_M33.Text = String.Format("{0,8:0.00000}", rotationMatrix.M33);
    });
}

備註

應用程式可以註冊此事件處理常式以取得感應器讀數。 應用程式必須建立所需的 ReportInterval。 這會通知感應器驅動程式應該配置資源以滿足應用程式的需求。

OrientationSensor會傳回四元數和旋轉矩陣。