/// <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);
}
}
//Event data bucket constructor.
public CustomFixationEventArgs(EFixationStreamEventType status, double timestamp, double x, double y)
{
Status = status;
TimeStamp = timestamp;
X = x;
Y = y;
}
/// <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>
/// Reset fixation data stream to its waiting state, this solves and issue when fixations are in close proximity, by stopping the stream getting stuck in the middle stae of a fixation.
/// </summary>
public void ResetFixationDetectionState()
{
fixationState = EFixationStreamEventType.Waiting;
bufferCurrentIndex = 0;
bufferFullIndex = 0;
xBuffer = new double[bufferSize];
yBuffer = new double[bufferSize];
Thread.Sleep(100);
}
//Constructor
public CustomFixationDataStream(FormsEyeXHost EyeXHost)
{
gazeStream = EyeXHost.CreateGazePointDataStream(GazePointDataMode.LightlyFiltered);
//Create gate points event handler delegate
EventHandler <GazePointEventArgs> gazeDel = new EventHandler <GazePointEventArgs>(updateGazeCoodinates);
//register delegate with gaze data stream next event.
gazeStream.Next += gazeDel;
gPAverage = new GazePoint();
xBuffer = new double[bufferSize];
yBuffer = new double[bufferSize];
fixationState = EFixationStreamEventType.Waiting;
}
//Constructor
public CustomFixationDataStream(FormsEyeXHost EyeXHost)
{
//Calculate the amount of pixels away from the top of the screen to set cut of for top of screen threshold adjustment.
yFixationScreenBoundary = Constants.PRIMARY_SCREEN.Height * (screenBoudaryCutOffPercent / 100);
gazeStream = EyeXHost.CreateGazePointDataStream(GazePointDataMode.Unfiltered);
//Create gate points event handler delegate
EventHandler <GazePointEventArgs> gazeDel = new EventHandler <GazePointEventArgs>(updateGazeCoodinates);
//register delegate with gaze data stream next event.
gazeStream.Next += gazeDel;
gPAverage = new GazePoint();
xBuffer = new double[bufferSize];
yBuffer = new double[bufferSize];
fixationState = EFixationStreamEventType.Waiting;
ZoomerFixation = false;
}
