private EyeMovement
(
EyeMovementType type,
DateTimeOffset timestamp,
DateTimeOffset endTimestamp
)
{
MovementType = type;
Timestamp = timestamp;
EndTimestamp = endTimestamp;
}
//Убираем повторы из записи тоби
public List <EyeMovementEventRecord> CompactRecords(List <EyeMovementEventRecord> records)
{
List <EyeMovementEventRecord> RecordsNew = new List <EyeMovementEventRecord>();
EyeMovementType Before = EyeMovementType.Other;
foreach (var tr in records)
{
if (tr.Type != Before)
{
RecordsNew.Add(tr);
Before = tr.Type;
}
}
return(RecordsNew);
}
public EyeMovement
(
EyeMovementType type,
Point2 gazePoint,
DateTimeOffset timestamp,
DateTimeOffset endTimestamp
)
: this
(
type,
timestamp,
endTimestamp
)
{
position = gazePoint;
}
public EyeMovement
(
EyeMovementType type,
EyeSample averageSample,
DateTimeOffset timestamp,
DateTimeOffset endTimestamp
)
: this
(
type,
timestamp,
endTimestamp
)
{
AverageSample = averageSample;
}
public EyeMovement
(
EyeMovementType type,
IEnumerable <EyeVelocity> samples,
EyeSample averageSample,
DateTimeOffset timestamp,
DateTimeOffset endTimestamp
)
: this
(
type,
averageSample,
timestamp,
endTimestamp
)
{
Samples = samples?.ToList() ?? Samples;
}
public static IObservable <EyeMovement> ClassifyMovements(this IObservable <EyeVelocity> velocities, double velocityThreshold)
{
return(velocities.Buffer((first, current) => ClassifyMovement(first, velocityThreshold) != ClassifyMovement(current, velocityThreshold))
.Where(b => b.Any())
.Buffer(2, 1)
.Scan <IList <IList <EyeVelocity> >, EyeMovement>(null, (movement, buffers) =>
{
var current = buffers.First();
var last = buffers.LastOrDefault();
var currentFirstSample = current.First();
DateTimeOffset startTimestamp = currentFirstSample.Eye.Timestamp;
if (movement != null)
{
var startTicksDiff = movement.EndTimestamp - movement.Samples.Last().Eye.Timestamp;
startTimestamp = startTimestamp.Subtract(startTicksDiff.Duration());
}
var currentLastSample = current.Last();
DateTimeOffset endTimestamp = currentLastSample.Eye.Timestamp;
if (last != null && last != current)
{
var endTicksDiff = (last.First().Eye.Timestamp - endTimestamp).Duration().Ticks / 2;
endTimestamp = endTimestamp.Add(TimeSpan.FromTicks(endTicksDiff));
}
EyeMovementType movementType = ClassifyMovement(current.First(), velocityThreshold);
EyeSample averageSample = null;
if (movementType == EyeMovementType.Fixation)
{
averageSample = EyeSampleUtils.Average(current.Select(s => s.Eye));
}
return new EyeMovement(movementType, current, averageSample, startTimestamp, endTimestamp);
}));
}
