/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
// Allows the game to exit
if (Microsoft.Xna.Framework.Input.Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Escape))
{
this.Exit();
}
AmbientLightSensorDataReport lightReport = (AmbientLightSensorDataReport)_lightSensor.GetDataReport();
_illuminanceLux = lightReport.IlluminanceLux;
// If the accelerometer is providing a value, we treat it as if it is measuring
// the direction of gravity and pass it into the marble so it can move around the screen.
// If the accelerometer is providing no value, the marble will not move.
_marble.UpdatePosition(gameTime, _orientationSourceProvider.Vector);
base.Update(gameTime);
}
/// <summary>
/// Fired when sensor data is updated.
/// </summary>
void OnDataUpdated(Sensor sensor, SensorDataReport newData)
{
AmbientLightSensorDataReport alsReport = (AmbientLightSensorDataReport)newData;
System.Diagnostics.Debug.WriteLine("Data event timestamp: " + alsReport.Timestamp.ToString());
// get the illuminance property value
double lightLux = alsReport.IlluminanceLux;
// Get the sensor id so we can associate the sensor lux value
// with a specific sensor id in our collection
Guid sensorId = sensor.SensorID;
if (sensorId != Guid.Empty)
{
// Set the sensor light value
SetSensorLightLuxValue(sensorId, lightLux);
}
}
/// <summary>
/// Query the sensor for any sensor data it has, then update the sensor
/// data by using the OnDataUpdated callback.
/// </summary>
private void RequestSensorDataReport(AmbientLightSensor sensor)
{
if (sensor != null)
{
// If the sensor is ready, we can query for the current sensor value
AmbientLightSensorDataReport data = null;
try
{
data = (AmbientLightSensorDataReport)sensor.GetDataReport();
}
catch (COMException ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
}
if (data != null)
{
// Initialize the sensor data value using the callback
OnDataUpdated(sensor, data);
}
}
}
