OrientationSensor.ReadingChanged 事件

定义

命名空间:

Windows.Devices.Sensors

每次方向传感器报告新的传感器读数时发生。

// 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) 

事件类型

TypedEventHandler<OrientationSensor,OrientationSensorReadingChangedEventArgs>

示例

以下示例演示使用 C# 和 XAML 生成的 UWP 应用如何注册其 ReadingChanged 事件处理程序。

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);
    }
}

以下示例演示 ReadingChanged 事件处理程序。

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);
    });
}

注解

应用程序可以注册此事件处理程序以获取传感器读数。 应用程序必须建立所需的 ReportInterval。 这会通知传感器驱动程序应分配资源以满足应用程序的要求。

OrientationSensor 返回四元数和旋转矩阵。