public Observation(string[] observationEntry, GazeLogEntry[] gazeLogEntries)
{
this.stimulus = Single.Parse(observationEntry[0]);
this.response = Int16.Parse(observationEntry[1]);
this.gazeEntries = gazeLogEntries;
}
public bool IsWithinDistance(GazeLogEntry other, float distance)
{
if( Math.Abs(this.distance - other.distance) < distance)
{
return true;
}
return false;
}
/// <summary>
/// Initializes a new instance of the <see cref="Experiment1Analysis.Trial"/> class.
/// </summary>
/// <param name="observationLogStream">Observation log, as a stream.</param>
/// <param name="gazeLogStream">Gaze log, as a stream.</param>
/// <param name="ID">1-based sequential ID number</param>
public Trial(StreamReader observationLogStream, StreamReader gazeLogStream, int ID, double clipObservationDurationMillis)
{
this.ID = ID;
// Skip forward to point where we're past headers
string[] observationsStrings = GetLinesStartingWithDigits(observationLogStream);
string[] gazeStrings = GetLinesStartingWithDigits(gazeLogStream);
List<GazeLogEntry> gazeLogs = new List<GazeLogEntry>(gazeStrings.Length);
List<int> observationsIndices = new List<int>(10);
observationsIndices.Add (0);
// Populate gazeLogs with data from gazeStrings, and find indices where a new observation begins
for(int i = 0; i < gazeStrings.Length; i++)
{
gazeLogs.Add (new GazeLogEntry(gazeStrings[i]));
if(i > 0)
{
TimeSpan ts = gazeLogs[i].timestamp - gazeLogs[i - 1].timestamp;
if(ts.TotalSeconds >= MINIMUM_SECONDS_BETWEEN_OBSERVATIONS)
{
observationsIndices.Add (i);
}
}
}
observationsIndices.Add (gazeStrings.Length);
observations = new Observation[observationsStrings.Length];
// Generate Observations from the combined observation and gaze data
// but disregard the last observation, as it is added by us
for(int i = 0; i < observationsStrings.Length - 1; i++)
{
int fromIndex = observationsIndices[i];
int toIndex = observationsIndices[i + 1];
int gazeLogCount = toIndex - fromIndex;
GazeLogEntry[] gazeEntriesForThisObservation = new GazeLogEntry[gazeLogCount];
gazeLogs.CopyTo(fromIndex, gazeEntriesForThisObservation, 0, gazeLogCount);
observations[i] = new Observation(
observationsStrings[i],
gazeEntriesForThisObservation,
clipObservationDurationMillis);
}
observations[observations.Length - 1] = new Observation(
observationsStrings[observations.Length - 1],
new GazeLogEntry[]{},
0);
}
public void ClipToDurationFromBeginning(double durationMillis)
{
if(gazeEntries.Length < 1)
{
return;
}
DateTime start = gazeEntries[0].timestamp;
int lastIndexWithinDuration = 1;
for( ; lastIndexWithinDuration < gazeEntries.Length; lastIndexWithinDuration++)
{
DateTime current = gazeEntries[lastIndexWithinDuration].timestamp;
if(durationMillis < (current - start).TotalMilliseconds)
{
break;
}
}
GazeLogEntry[] clipped = new GazeLogEntry[lastIndexWithinDuration + 1];
Array.Copy(gazeEntries, clipped, lastIndexWithinDuration + 1);
gazeEntries = clipped;
}
public Observation(string observationEntry, GazeLogEntry[] gazeLogEntries)
: this(observationEntry.Split (new char[]{','}), gazeLogEntries)
{
}
public Observation(string observationEntry, GazeLogEntry[] gazeLogEntries, double clipDurationMillis)
: this(observationEntry.Split (new char[]{','}), gazeLogEntries)
{
ClipToDurationFromBeginning(clipDurationMillis);
}
