public EyeXGazePointDataStream(EyeXHost host, EyeXGazePointType gazePointType)
{
_eyeXHost = host;
_gazePointType = gazePointType;
// create a global interactor for the data stream and register it with the EyeXHost.
var interactor = new EyeXGlobalInteractor(InteractorId, AssignGazePointDataBehavior, HandleEvent);
_eyeXHost.RegisterGlobalInteractor(interactor);
}
/// <summary>
/// Stops streaming gaze point data of a given type.
/// </summary>
/// <param name="gazePointType">Gaze point type.</param>
public void StopStreaming(EyeXGazePointType gazePointType)
{
EyeXGazePointDataStream dataStream;
if (_gazePointDataStreams.TryGetValue(gazePointType, out dataStream))
{
if (dataStream.UsageCount > 1)
{
dataStream.UsageCount--;
}
else
{
_gazePointDataStreams.Remove(gazePointType);
dataStream.Dispose();
}
}
}
/// <summary>
/// Gets the most recent value from a data stream.
/// </summary>
/// <param name="gazePointType">Gaze point type.</param>
/// <returns>The value.</returns>
public EyeXGazePoint GetLastGazePoint(EyeXGazePointType gazePointType)
{
EyeXGazePointDataStream dataStream;
if (_gazePointDataStreams.TryGetValue(gazePointType, out dataStream))
{
return dataStream.Last;
}
else
{
return EyeXGazePoint.Invalid;
}
}
/// <summary>
/// Starts streaming gaze point data of a given type.
/// </summary>
/// <param name="gazePointType">Gaze point type.</param>
public void StartStreaming(EyeXGazePointType gazePointType)
{
EyeXGazePointDataStream dataStream;
if (_gazePointDataStreams.TryGetValue(gazePointType, out dataStream))
{
// already streaming this kind of data.
dataStream.UsageCount++;
}
else
{
dataStream = new EyeXGazePointDataStream(EyeXHost.GetInstance(), gazePointType);
_gazePointDataStreams.Add(gazePointType, dataStream);
}
}
/// <summary>
/// Gets the number of fixations since the stream started
/// </summary>
/// <param name="gazePointType">Gaze point type.</param>
/// <returns>The value.</returns>
public int GetLastFixationCount(EyeXGazePointType gazePointType)
{
EyeXGazePointDataStream dataStream;
if (_gazePointDataStreams.TryGetValue(gazePointType, out dataStream))
{
return dataStream.FixationCount;
}
else
{
return -1;
}
}