public async override void SubscribeToGazeDataAsync()
{
var gazePointDataStream = Host.Streams.CreateGazePointDataStream();
gazePointDataStream.GazePoint((x, y, ts) => handleGazeData(x, y, ts));
void handleGazeData(double x, double y, double ts)
{
// Converting Tobii Core GazeData to EyeX GazeData Format
GazeData.GazeData gazeData = new GazeData.GazeData
{
Type = nameof(GazeDataTypes.GAZEPOINTS),
Timestamp = (long)ts,
X_Median = x / 3840,
Y_Median = y / 2160
};
GazeDataProcessor.ProcessGazeData(gazeData);
switch (Settings.Default.FixationAlgorithm)
{
// Use implemented IDT Algorithm
case "IDT":
GazeDataProcessor.ProcessFixationData(null, gazeData);
break;
// Use Tobii Core Default Fixation Alogrithm
default:
SubscribeToFixationDataAsync();
break;
}
}
}
public static GazeData.GazeData Compute(GazeData.GazeData gazeData)
{
try
{
if (GazeDataList.Count < 2)
{
GazeDataList.Add(gazeData);
return(gazeData);
}
else
{
GazeDataList.Add(gazeData);
double x_sum = 0.0;
double y_sum = 0.0;
foreach (var fd in GazeDataList)
{
x_sum += fd.X_Median;
y_sum += fd.Y_Median;
}
gazeData.X_Median = x_sum / 3.0;
gazeData.Y_Median = y_sum / 3.0;
GazeDataList.Remove(GazeDataList.First());
return(gazeData);
}
}
catch (Exception ex)
{
GazeDataList = new List <GazeData.GazeData>();
return(gazeData);
// pass Enumeration error
}
}
private static double GetDistance(GazeData.GazeData previousGazeData, GazeData.GazeData gazeData)
{
Vector3D origin = new Vector3D(previousGazeData.GazeOrigin_X_Median, previousGazeData.GazeOrigin_Y_Median, previousGazeData.GazeOrigin_Z_Median);
Vector3D p1 = new Vector3D(previousGazeData.X_3D_Median, previousGazeData.Y_3D_Median, previousGazeData.Z_3D_Median);
Vector3D p2 = new Vector3D(gazeData.X_3D_Median, gazeData.Y_3D_Median, gazeData.Z_3D_Median);
Vector3D originToP1 = Vector3D.Subtract(p1, origin);
Vector3D originToP2 = Vector3D.Subtract(p2, origin);
return(Vector3D.AngleBetween(originToP1, originToP2) * 600);
}
public static FixationData Classify(GazeData.GazeData gazeData)
{
FixationData fixationData = gazeData.ToFixationData();
if (XValueList.Count < Settings.Default.IDT_Window)
{
fixationData.Type = "SACCADES";
XValueList.Add(fixationData.X_Median);
YValueList.Add(fixationData.Y_Median);
}
else
{
XValueList.RemoveAt(0);
YValueList.RemoveAt(0);
XValueList.Add(fixationData.X_Median);
YValueList.Add(fixationData.Y_Median);
double dispersion = GetDispersion(fixationData);
if (dispersion > Settings.Default.IDT_Threshold)
{
if (PreviousFixationData.Type == "FIXATIONS")
{
fixationData.EventType = "END";
}
fixationData.EventType = "SACCADES";
fixationData.Type = "SACCADES";
//Console.WriteLine("-------------XXX--------------------");
}
else
{
//Console.WriteLine("--------------------FIXATION--------------------");
fixationData.Type = "FIXATIONS";
if (PreviousFixationData.Type == "SACCADES")
{
fixationData.EventType = "BEGIN";
counter += 1;
}
else
{
fixationData.EventType = "DATA";
}
// For Fixations - compute centroid
fixationData.X_Median = XValueList.Average();
fixationData.Y_Median = YValueList.Average();
}
}
//Console.WriteLine(counter);
PreviousFixationData = fixationData;
return(fixationData);
}
/// <summary>
/// Retrieves Tobii Pro Api Gaze Data and sends it further to the Data Processor
/// </summary>
/// <returns></returns>
public async override void SubscribeToGazeDataAsync()
{
EyeTracker.GazeDataReceived += (sender, gazeDataEventArgs) =>
{
// Converting Tobii Pro GazeData to EyeX GazeData Format
GazeData.GazeData gazeData = new GazeData.GazeData
{
Type = nameof(GazeDataTypes.GAZEPOINTS),
PupilDiameter_Left = gazeDataEventArgs.LeftEye.Pupil.PupilDiameter,
PupilDiameter_Right = gazeDataEventArgs.RightEye.Pupil.PupilDiameter,
Timestamp = gazeDataEventArgs.SystemTimeStamp,
Y_Left = gazeDataEventArgs.LeftEye.GazePoint.PositionOnDisplayArea.Y,
Y_Right = gazeDataEventArgs.RightEye.GazePoint.PositionOnDisplayArea.Y,
X_Left = gazeDataEventArgs.LeftEye.GazePoint.PositionOnDisplayArea.X,
X_Right = gazeDataEventArgs.RightEye.GazePoint.PositionOnDisplayArea.X,
};
// Map 3D Eye Coordinates
var originR = gazeDataEventArgs.RightEye.GazeOrigin.PositionInTrackBoxCoordinates;
var originL = gazeDataEventArgs.LeftEye.GazeOrigin.PositionInTrackBoxCoordinates;
gazeData.GazeOrigin_X_Median = (originR.X + originL.X) / 2.0;
gazeData.GazeOrigin_Y_Median = (originR.Y + originL.Y) / 2.0;
gazeData.GazeOrigin_Y_Median = (originR.Z + originL.Z) / 2.0;
gazeData.X_3D_Median = gazeDataEventArgs.RightEye.GazePoint.PositionInUserCoordinates.X;
gazeData.Y_3D_Median = gazeDataEventArgs.RightEye.GazePoint.PositionInUserCoordinates.Y;
gazeData.Z_3D_Median = gazeDataEventArgs.RightEye.GazePoint.PositionInUserCoordinates.Z;
// Map Validity Values
gazeData.GazePointValidity_Left = gazeDataEventArgs.LeftEye.GazePoint.Validity == Validity.Valid ? true : false;
gazeData.GazePointValidity_Right = gazeDataEventArgs.RightEye.GazePoint.Validity == Validity.Valid ? true : false;
gazeData.PupilValidity_Left = gazeDataEventArgs.LeftEye.Pupil.Validity == Validity.Valid ? true : false;
gazeData.PupilValidity_Right = gazeDataEventArgs.RightEye.Pupil.Validity == Validity.Valid ? true : false;
// Compute Median Gaze Points
gazeData.Y_Median = (gazeData.Y_Left + gazeData.Y_Right) / 2;
gazeData.X_Median = (gazeData.X_Left + gazeData.X_Right) / 2;
if (!double.IsNaN(gazeData.X_Median))
{
GazeDataProcessor.ProcessGazeData(gazeData);
GazeDataProcessor.ProcessFixationData(null, gazeData);
}
};
}
public static FixationData Classify(GazeData.GazeData gazeData, double threshold)
{
FixationData fixationData = gazeData.ToFixationData();
if (PreviousFixationData == null)
{
fixationData.Type = "SACCADES";
}
else
{
double distance = GetDistance(PreviousFixationData, gazeData);
if (distance > 600)
{
if (PreviousFixationData.Type == "FIXATIONS")
{
fixationData.EventType = "END";
}
fixationData.Type = "SACCADES";
//Console.WriteLine("-------------XXX--------------------");
}
else
{
//Console.WriteLine("--------------------FIXATION--------------------");
fixationData.Type = "FIXATIONS";
if (PreviousFixationData.Type == "SACCADES")
{
fixationData.EventType = "BEGIN";
}
else
{
fixationData.EventType = "DATA";
}
}
}
PreviousFixationData = fixationData;
return(fixationData);
}
