OrientationSensor Class

Reference

Definition

Namespace:: Windows.Devices.Sensors

Important

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Edit

Represents an orientation sensor.

This sensor returns a rotation matrix and a Quaternion that can be used to adjust the user's perspective in a game application.

For an example implementation, see the orientation sensor sample.

public ref class OrientationSensor sealed

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class OrientationSensor final

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class OrientationSensor

Public NotInheritable Class OrientationSensor

Inheritance: Object Platform::Object IInspectable OrientationSensor

Attributes: ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Remarks

Sensor data is provided relative to the device's fixed sensor coordinate system, and is independent of display orientation. For applications that rely on sensor data for input control or to manipulate elements on the screen, the developer must take current display orientation into account and compensate the data appropriately. For more info about the sensor coordinate system, see Sensor data and display orientation.

The following example demonstrates how a UWP app built with XAML and C# uses the GetDefault method to establish a connection to an orientation sensor. If no orientation sensor is found, the method will return a null value.

_sensor = OrientationSensor.GetDefault();

The following example demonstrates how a UWP app built with XAML registers a ReadingChanged event handler.

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);
    }
}

The following example shows the ReadingChanged event handler.

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);
    });
}

Version history

Windows version	SDK version	Value added
1607	14393	GetDefault(SensorReadingType)
1607	14393	GetDefault(SensorReadingType,SensorOptimizationGoal)
1709	16299	FromIdAsync
1709	16299	GetDeviceSelector(SensorReadingType)
1709	16299	GetDeviceSelector(SensorReadingType,SensorOptimizationGoal)
1709	16299	MaxBatchSize
1709	16299	ReportLatency

Properties

DeviceId	Gets the device identifier.
MaxBatchSize	Gets the maximum number of events that can be batched by the sensor.
MinimumReportInterval	Gets the minimum report interval supported by the sensor.
ReadingTransform	Gets or sets the transformation that needs to be applied to sensor data. Transformations to be applied are tied to the display orientation with which to align the sensor data.
ReadingType	Gets the sensor reading type.
ReportInterval	Gets or sets the report interval supported by the sensor.
ReportLatency	Gets or sets the delay between batches of sensor information.

Methods

FromIdAsync(String)	Asynchronously obtains the sensor from its identifier.
GetCurrentReading()	Gets the current sensor reading.
GetDefault()	Returns the default orientation sensor for absolute readings.
GetDefault(SensorReadingType, SensorOptimizationGoal)	Returns the default orientation sensor, taking into account power and accuracy preferences.
GetDefault(SensorReadingType)	Returns the default orientation sensor, taking into account accuracy preferences.
GetDefaultForRelativeReadings()	Returns the default orientation sensor for relative readings.
GetDeviceSelector(SensorReadingType, SensorOptimizationGoal)	Gets the device selector.
GetDeviceSelector(SensorReadingType)	Gets the device selector.

Events

ReadingChanged

Occurs each time the orientation sensor reports a new sensor reading.

Applies to

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