/// <summary>
/// Forwards 2D gaze points to fixation detector. Gaze points are only forwarded
/// if CPU and Eyetracker clocks are synchronized and validity is < 2. If both eyes are valid gaze point coordinates are averaged,
/// if only one eye is valid, only that eye's gaze point is used.
/// </summary>
/// <param name="sender"></param>
/// <param name="e">GazeDataItem to process</param>
protected override void GazeDataReceivedSynchronized(object sender, GazeDataEventArgs e)
{
// ignore gaze data with low validity
if (e.GazeDataItem.LeftValidity < 2 || e.GazeDataItem.RightValidity < 2)
{
// convert timestamp
long microseconds = e.GazeDataItem.TimeStamp;
int milliseconds = (int)(microseconds / 1000);
milliseconds -= getTimestampOffset(milliseconds);
int time = milliseconds;
if (((microseconds / 100) % 10) >= 5)
{
time++; // round
}
// convert normalized screen coordinates (float between [0 - 1]) to pixel coordinates
// coordinates (0, 0) designate the top left corner
double leftX = e.GazeDataItem.LeftGazePoint2D.X * SCREEN_WIDTH;
double leftY = e.GazeDataItem.LeftGazePoint2D.Y * SCREEN_HEIGHT;
double rightX = e.GazeDataItem.RightGazePoint2D.X * SCREEN_WIDTH;
double rightY = e.GazeDataItem.RightGazePoint2D.Y * SCREEN_HEIGHT;
if (e.GazeDataItem.LeftValidity < 2 && e.GazeDataItem.RightValidity < 2)
{
// average left and right eyes
int x = (int)((leftX + rightX) / 2);
int y = (int)((leftY + rightY) / 2);
fixationDetector.addPoint(time, x, y);
}
else if (e.GazeDataItem.LeftValidity < 2)
{
// use only left eye
fixationDetector.addPoint(time, (int)leftX, (int)leftY);
}
else if (e.GazeDataItem.RightValidity < 2)
{
// use only right eye
fixationDetector.addPoint(time, (int)rightX, (int)rightY);
}
}
}
int count = 0;//testing
/// <summary>
/// Forwards 2D gaze points to fixation detector. Gaze points are only forwarded
/// if CPU and Eyetracker clocks are synchronized.
///
/// Detailed explanation of synchronization available in Tobii SDK 3.0 Developer Guide.
/// http://www.tobii.com/Global/Analysis/Downloads/User_Manuals_and_Guides/Tobii%20SDK%203.0%20Release%20Candidate%201%20Developers%20Guide.pdf
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public override void GazeDataReceived(object sender, GazeDataEventArgs e)
{
if (syncManager.SyncState.StateFlag == SyncStateFlag.Synchronized && count < 3)//testing
{
int time = (int)syncManager.RemoteToLocal(e.GazeDataItem.TimeStamp);
int x = (int)e.GazeDataItem.LeftGazePoint3D.X; // TODO Determine which of LeftGazePoint2D, LeftGazePoint3D, RightGazePoint2D, RightGazePoint3D or combination thereof is same as Tobii Studio
int y = (int)e.GazeDataItem.LeftGazePoint3D.Y;
fixationDetector.addPoint(time, x, y);
// testing
/*GazeDataItem gdi = e.GazeDataItem;
* Console.WriteLine("GazeDataItem:\r\n" +
* "LeftEyePosition3D (" + gdi.LeftEyePosition3D.X + ", " + gdi.LeftEyePosition3D.Y + ", " + gdi.LeftEyePosition3D.Z + ")\r\n" +
* "LeftEyePosition3DRelative (" + gdi.LeftEyePosition3DRelative.X + ", " + gdi.LeftEyePosition3DRelative.Y + ", " + gdi.LeftEyePosition3DRelative.Z + ")\r\n" +
* "LeftGazePoint2D (" + gdi.LeftGazePoint2D.X + ", " + gdi.LeftGazePoint2D.Y + ")\r\n" +
* "LeftGazePoint3D (" + gdi.LeftGazePoint3D.X + ", " + gdi.LeftGazePoint3D.Y + ", " + gdi.LeftGazePoint3D.Z + ")\r\n" +
* "RightEyePosition3D (" + gdi.RightEyePosition3D.X + ", " + gdi.RightEyePosition3D.Y + ", " + gdi.RightEyePosition3D.Z + ")\r\n" +
* "RightEyePosition3DRelative (" + gdi.RightEyePosition3DRelative.X + ", " + gdi.RightEyePosition3DRelative.Y + ", " + gdi.RightEyePosition3DRelative.Z + ")\r\n" +
* "RightGazePoint2D (" + gdi.RightGazePoint2D.X + ", " + gdi.RightGazePoint2D.Y + ")\r\n" +
* "RightGazePoint3D (" + gdi.RightGazePoint3D.X + ", " + gdi.RightGazePoint3D.Y + ", " + gdi.RightGazePoint3D.Z + ")");
* count++;*/
}
}
