public virtual GazeFilterArgs Update(GazeFilterArgs args)
{
if (_lastTimestamp == TimeSpan.Zero)
{
_lastTimestamp = args.Timestamp;
_pointFilter = new LowpassFilter(args.Location);
_deltaFilter = new LowpassFilter(default);
private void ProcessGazePoint(TimeSpan timestamp, Point position)
{
var ea = new GazeFilterArgs(position, timestamp);
var fa = Filter.Update(ea);
_gazeCursor.Position = fa.Location;
if (_gazeEventCount != 0)
{
_gazeEventArgs.Set(fa.Location, timestamp);
_gazeEvent?.Invoke(this, _gazeEventArgs);
if (_gazeEventArgs.Handled)
{
return;
}
}
var targetItem = ResolveHitTarget(fa.Location, fa.Timestamp);
Debug.Assert(targetItem != null, "targetItem is null when processing gaze point");
// Debug.WriteLine("ProcessGazePoint. [{0}, {1}], {2}", (int)fa.Location.X, (int)fa.Location.Y, fa.Timestamp);
// check to see if any element in _hitTargetTimes needs an exit event fired.
// this ensures that all exit events are fired before enter event
CheckIfExiting(fa.Timestamp);
PointerState nextState = (PointerState)((int)targetItem.ElementState + 1);
// Debug.WriteLine(targetItem.TargetElement.ToString());
// Debug.WriteLine("\tState={0}, Elapsed={1}, NextStateTime={2}", targetItem.ElementState, targetItem.ElapsedTime, targetItem.NextStateTime);
if (targetItem.ElapsedTime > targetItem.NextStateTime)
{
var prevStateTime = targetItem.NextStateTime;
////Debug.WriteLine(prevStateTime);
// prevent targetItem from ever actually transitioning into the DwellRepeat state so as
// to continuously emit the DwellRepeat event
if (nextState != PointerState.DwellRepeat)
{
targetItem.ElementState = nextState;
nextState = (PointerState)((int)nextState + 1); // nextState++
targetItem.NextStateTime += GetElementStateDelay(targetItem.TargetElement, nextState);
if (targetItem.ElementState == PointerState.Dwell)
{
targetItem.NextStateTime += GetElementStateDelay(targetItem.TargetElement, GazeInput.RepeatDelayDurationProperty, _defaultDwellRepeatDelay);
}
}
else
{
// move the NextStateTime by one dwell period, while continuing to stay in Dwell state
targetItem.NextStateTime += GetElementStateDelay(targetItem.TargetElement, PointerState.DwellRepeat);
}
if (targetItem.ElementState == PointerState.Dwell)
{
targetItem.RepeatCount++;
if (targetItem.MaxDwellRepeatCount < targetItem.RepeatCount)
{
targetItem.NextStateTime = new TimeSpan(long.MaxValue);
}
}
if (targetItem.ElementState == PointerState.Fixation)
{
// Cache the fixated item
_currentlyFixatedElement = targetItem;
// We are about to transition into the Dwell state
// If switch input is enabled, make sure dwell never completes
// via eye gaze
if (IsSwitchEnabled)
{
// Don't allow the next state (Dwell) to progress
targetItem.NextStateTime = new TimeSpan(long.MaxValue);
}
}
RaiseGazePointerEvent(targetItem, targetItem.ElementState, targetItem.ElapsedTime);
}
targetItem.GiveFeedback();
_eyesOffTimer.Start();
_lastTimestamp = fa.Timestamp;
}
public virtual GazeFilterArgs Update(GazeFilterArgs args)
{
return(args);
}
