/// <summary>
/// Checks input data from variance calculation and raises appropriate event depending on this data and the CustomfixationDetectionStreams current state
/// </summary>
/// <param name="gazeVariation"></param>
/// <param name="timestamp"></param>
private void generateFixationState(GazePoint gazeVariation, double timestamp)
{
//Set pointer to next fixation data bucket.
CustomFixationEventArgs cpe = null;
//Check gaze data variation, current state and create appropriate event. Then set the CustomfixationDetectionStreams state.
if (fixationState == EFixationStreamEventType.Waiting && gazeVariation.x < xFixationThreashold && gazeVariation.y < yFixationThreashold)
{
cpe = new CustomFixationEventArgs(EFixationStreamEventType.Start, timestamp, gPAverage.x, gPAverage.y);
fixationState = EFixationStreamEventType.Middle;
}
else if (fixationState == EFixationStreamEventType.Middle && gazeVariation.x > xFixationThreashold && gazeVariation.y > yFixationThreashold)
{
cpe = new CustomFixationEventArgs(EFixationStreamEventType.End, timestamp, gPAverage.x, gPAverage.y);
fixationState = EFixationStreamEventType.Waiting;
}
else if (fixationState == EFixationStreamEventType.Middle)
{
cpe = new CustomFixationEventArgs(EFixationStreamEventType.Middle, timestamp, gPAverage.x, gPAverage.y);
}
//raise the event.
if (cpe != null)
{
onFixationStateChange(cpe);
}
}
//Method that raises fixation event.
private void onFixationStateChange(CustomFixationEventArgs newFixation)
{
if (next != null)
{
next(this, newFixation);
}
}
/// <summary>
/// Checks input data from variance calculation and raises appropriate event depending on this data and the CustomfixationDetectionStreams current state
/// </summary>
/// <param name="gazeVariation"></param>
/// <param name="timestamp"></param>
private void generateFixationState(GazePoint gazeVariation, double timestamp)
{
//Set pointer to next fixation data bucket.
CustomFixationEventArgs cpe = null;
//check where users gaze is, if it is less than yFixationScreenBoundary set yAdjustedThreashold to yFixationCutOffThreasholdWhenGazeAtTopOfScreen
//To compensate for EyeX's poor accuracy when gazing near top edge of screen.
double yAdjustedThreashold = gPAverage.Y < yFixationScreenBoundary && !ZoomerFixation ? yFixationCutOffThreasholdWhenGazeAtTopOfScreen : yFixationThreashold;
//Check gaze data variation, current state and create appropriate event. Then set the CustomfixationDetectionStreams state.
if (fixationState == EFixationStreamEventType.Waiting && gazeVariation.X < xFixationThreashold && gazeVariation.Y < yAdjustedThreashold)
{
cpe = new CustomFixationEventArgs(EFixationStreamEventType.Start, timestamp, gPAverage.X, gPAverage.Y);
fixationState = EFixationStreamEventType.Middle;
}
else if (fixationState == EFixationStreamEventType.Middle && gazeVariation.X > xFixationThreashold && gazeVariation.Y > yAdjustedThreashold)
{
cpe = new CustomFixationEventArgs(EFixationStreamEventType.End, timestamp, gPAverage.X, gPAverage.Y);
fixationState = EFixationStreamEventType.Waiting;
}
else if (fixationState == EFixationStreamEventType.Middle)
{
cpe = new CustomFixationEventArgs(EFixationStreamEventType.Middle, timestamp, gPAverage.X, gPAverage.Y);
}
//raise the event.
if (cpe != null)
{
onFixationStateChange(cpe);
}
}
/// <summary>
/// This method of is run on gaze events, checks if it is the beginning or end of a fixation and runs appropriate code.
/// </summary>
/// <param name="o"></param>
/// <param name="fixationDataBucket"></param>
private void detectFixation(object o, CustomFixationEventArgs fixationDataBucket)
{
//Check if FixationDetection needs to be monitoring CustomFixation data stream.
if (fixationState == EFixationState.DetectingFixation)
{
GazePoint currentSmoothPoint;
//If databucket state is the start of a fixation
if (fixationDataBucket.Status == EFixationStreamEventType.Start)
{
fixationTimer.Start();
//increment timeout interval so a fixation doesn't get cut off.
timeOutTimer.Interval += FixationDetectionTimeLength + FixationExtensionBuffer;;
Console.WriteLine(timeOutTimer.Interval);
fixationProgressStartTimeStamp = fixationDataBucket.TimeStamp;
//Instantiate new point smoother, this clears out and previous in the ring buffer.
pointSmootherWorker = new PointSmoother(pointSmootherBufferSize);
Console.WriteLine("Fixation Begin X" + fixationDataBucket.X + " Y" + fixationDataBucket.Y);
}
//if fixation data is in the middle of a fixation, use the data returned to highlight progress and draw users current gaze location to the screen.
if (fixationDataBucket.Status == EFixationStreamEventType.Middle)
{
//Check if point smoothing is required.
if (usePointSmoother)
{
//Data smoothing being done in CustomFixationDectection,
currentSmoothPoint = pointSmootherWorker.UpdateAndGetSmoothPoint(fixationDataBucket.X, fixationDataBucket.Y);
xPosFixation = (int)Math.Floor(currentSmoothPoint.x);
yPosFixation = (int)Math.Floor(currentSmoothPoint.y);
}
else
{
//Slightly smoothed data from the Customfixation data stream
xPosFixation = (int)Math.Floor(fixationDataBucket.X);
yPosFixation = (int)Math.Floor(fixationDataBucket.Y);
}
// calculateFixationProgressPercent(fixationDataBucket.TimeStamp);
onFixationProgressEvent(fixationDataBucket.TimeStamp, xPosFixation, yPosFixation);
}
//if the fixation ends before the fixation timer completes, reset the fixation timer.
if (fixationDataBucket.Status == EFixationStreamEventType.End)
{
fixationTimer.Stop();
//customfixStream.ResetFixationDetectionState();
//Debug
Console.WriteLine("Fixation Stopped due to end datatype");
}
}
}
