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);
}
}
}
