///////////////////////////////////////////////////////////////////////////////
// Methods for doing main class job //
///////////////////////////////////////////////////////////////////////////////
#region PRIVATEMETHODS
/// <summary>
/// Writes given fixation data into the data sets fixation tables.
/// </summary>
/// <param name="fixationToSave">Fixation to be written to database</param>
private void SaveFixationToTable(Fixation fixationToSave)
{
DataTable fixTable = null;
if (fixationToSave.SampleType == (fixationToSave.SampleType | SampleType.Gaze))
{
fixTable = Document.ActiveDocument.DocDataSet.GazeFixations;
}
else if (fixationToSave.SampleType == (fixationToSave.SampleType | SampleType.Mouse))
{
fixTable = Document.ActiveDocument.DocDataSet.MouseFixations;
}
// Create New Fixation DataRow
DataRow workRowFixationData;
workRowFixationData = fixTable.NewRow();
// Fill with Data
workRowFixationData["SubjectName"] = fixationToSave.SubjectName;
workRowFixationData["TrialID"] = fixationToSave.TrialID;
workRowFixationData["TrialSequence"] = fixationToSave.TrialSequence;
workRowFixationData["CountInTrial"] = fixationToSave.CountInTrial;
workRowFixationData["StartTime"] = fixationToSave.StartTime;
workRowFixationData["Length"] = fixationToSave.Length;
workRowFixationData["PosX"] = fixationToSave.PosX;
workRowFixationData["PosY"] = fixationToSave.PosY;
// Write into DB
try
{
fixTable.Rows.Add(workRowFixationData);
}
catch (Exception ex)
{
ExceptionMethods.HandleException(ex);
}
}
///////////////////////////////////////////////////////////////////////////////
// Methods for doing main class job //
///////////////////////////////////////////////////////////////////////////////
#region PRIVATEMETHODS
/// <summary>
/// Writes given fixation data into the data sets fixation tables.
/// </summary>
/// <param name="fixationToSave">Fixation to be written to database</param>
private void SaveFixationToTable(Fixation fixationToSave)
{
DataTable fixTable = null;
if (fixationToSave.SampleType == (fixationToSave.SampleType | SampleType.Gaze))
{
fixTable = Document.ActiveDocument.DocDataSet.GazeFixations;
}
else if (fixationToSave.SampleType == (fixationToSave.SampleType | SampleType.Mouse))
{
fixTable = Document.ActiveDocument.DocDataSet.MouseFixations;
}
// Create New Fixation DataRow
DataRow workRowFixationData;
workRowFixationData = fixTable.NewRow();
// Fill with Data
workRowFixationData["SubjectName"] = fixationToSave.SubjectName;
workRowFixationData["TrialID"] = fixationToSave.TrialID;
workRowFixationData["TrialSequence"] = fixationToSave.TrialSequence;
workRowFixationData["CountInTrial"] = fixationToSave.CountInTrial;
workRowFixationData["StartTime"] = fixationToSave.StartTime;
workRowFixationData["Length"] = fixationToSave.Length;
workRowFixationData["PosX"] = fixationToSave.PosX;
workRowFixationData["PosY"] = fixationToSave.PosY;
// Write into DB
try
{
fixTable.Rows.Add(workRowFixationData);
}
catch (Exception ex)
{
ExceptionMethods.HandleException(ex);
}
}
/// <summary>
/// Calculates fixations from raw data and writes them into
/// the database in the fixations tables.
/// </summary>
/// <param name="sampleType">The <see cref="SampleType"/> of the data, gaze or mouse</param>
/// <param name="subject">A <see cref="String"/> with the subject name</param>
/// <param name="trialsTable">The database trials <see cref="DataTable"/></param>
/// <param name="worker">The <see cref="BackgroundWorker"/> of the calculation</param>
/// <param name="e">The <see cref="DoWorkEventArgs"/> of the <see cref="BackgroundWorker"/></param>
public void CalcFixations(
SampleType sampleType,
string subject,
System.Data.DataTable trialsTable,
BackgroundWorker worker,
DoWorkEventArgs e)
{
// Fixation Calculating Objects //////////////////////////////////////////
FixationDetection objFixationDetection = new FixationDetection();
// Instantiate the delegate using the method as a parameter
GetDataDelegate getDataMethod = null;
int minSamples = 0;
int maxDistance = 0;
if (sampleType == (sampleType | SampleType.Gaze))
{
getDataMethod = Queries.GetGazeData;
minSamples = this.gazeMinSamples;
maxDistance = this.gazeMaxDistance;
}
else if (sampleType == (sampleType | SampleType.Mouse))
{
getDataMethod = Queries.GetMouseData;
minSamples = this.mouseMinSamples;
maxDistance = this.mouseMaxDistance;
}
bool point_found_delayed;
/* sample gazepoint-found flag, */
/* min_fix_samples ago */
float x_delayed; /* sample gazepoint coordinates, */
float y_delayed; /* min_fix_samples ago */
float deviation_delayed;
/* deviation of the gaze from the */
/* present fixation, */
/* min_fix_samples ago */
/* Fixation data - delayed: */
float x_fix_delayed = new float(); /* fixation point as estimated */
float y_fix_delayed = new float(); /* min_fix_samples ago */
int saccade_duration_delayed;
/* duration of the saccade */
/* preceeding the preset fixation */
/* (samples) */
long fix_start_time = new long();
int fix_duration_delayed_samples = new int(); /* duration of the present fixation */
long fix_duration_delayed_milliseconds = new long(); /* duration of the present fixation */
EyeMotionState currentState = new EyeMotionState();
// OtherVars
int counterTrial = 0;
PointF trialLastFixCenter = new PointF(0, 0);
// Loop Rows=Trials
foreach (DataRow trialRow in trialsTable.Rows)
{
List<Fixation> fixations = new List<Fixation>();
// Reinitialize Fixation detection object
// to ensure no overlay between fixations of
// trials that follow each other.
objFixationDetection.InitFixation(minSamples);
int trialID = (int)trialRow["TrialID"];
int trialSequence = (int)trialRow["TrialSequence"];
// Holds RawData corresponding to selected trial and subject
DataTable rawDataTable = Queries.GetRawDataBySubjectAndTrialSequence(subject, trialSequence);
long trialStartTime = rawDataTable.Rows.Count > 0 ? (long)rawDataTable.Rows[0]["Time"] : 0;
int counterRows = 0;
int counterFix = 0;
bool isFixation = false;
// Loop RawData
foreach (DataRow rowRaw in rawDataTable.Rows)
{
PointF? newPt;
SampleValidity isValidData = getDataMethod(
rowRaw,
Document.ActiveDocument.PresentationSize,
out newPt);
bool useSample = false;
switch (isValidData)
{
case SampleValidity.Valid:
useSample = true;
break;
case SampleValidity.Empty:
useSample = true;
break;
case SampleValidity.Null:
break;
case SampleValidity.OutOfStimulus:
useSample = true;
break;
}
if (useSample)
{
PointF dataPoint = newPt.Value;
currentState = objFixationDetection.DetectFixation(
dataPoint.IsEmpty ? false : true,
Convert.ToInt64(rowRaw[3]),
dataPoint.X,
dataPoint.Y,
maxDistance,
minSamples,
out point_found_delayed,
out x_delayed,
out y_delayed,
out deviation_delayed,
out x_fix_delayed,
out y_fix_delayed,
out saccade_duration_delayed,
out fix_start_time,
out fix_duration_delayed_milliseconds,
out fix_duration_delayed_samples);
switch (currentState)
{
case EyeMotionState.FIXATING:
if (!isFixation)
{
isFixation = true;
}
break;
case EyeMotionState.FIXATION_COMPLETED:
PointF fixationCenter = new PointF(x_fix_delayed, y_fix_delayed);
// if (!Queries.OutOfScreen(fixationCenter)) TODO
{
Fixation completedFixation = new Fixation();
completedFixation.CountInTrial = counterFix + 1;
completedFixation.Length = fix_duration_delayed_milliseconds;
completedFixation.PosX = x_fix_delayed;
completedFixation.PosY = y_fix_delayed;
completedFixation.SampleType = sampleType;
completedFixation.StartTime = fix_start_time - trialStartTime;
completedFixation.SubjectName = (string)trialRow["SubjectName"];
completedFixation.TrialID = (int)trialRow["TrialID"];
completedFixation.TrialSequence = (int)trialRow["TrialSequence"];
if (this.eliminateFirstFixation && this.eliminateFirstFixationSimple == false && counterFix == 0 && VGPolyline.Distance(fixationCenter, trialLastFixCenter) < maxDistance && fix_duration_delayed_milliseconds < this.limitForFirstFixation)
{
// Eliminate if applicable
}
else if (this.eliminateFirstFixationSimple && counterFix == 0)
{
// do nothing, just go on with the next fixation eliminating this one
counterFix++;
}
else
{
fixations.Add(completedFixation);
counterFix++;
}
}
isFixation = false;
break;
case EyeMotionState.ERROR:
break;
default:
break;
}
}
counterRows++;
// End RawData Loop
}
// Save last Fix if it has not been saved by a following saccade
if (isFixation && fix_duration_delayed_milliseconds > 0)
{
Fixation lastFixation = new Fixation();
lastFixation.CountInTrial = counterFix + 1;
lastFixation.Length = fix_duration_delayed_milliseconds;
lastFixation.PosX = x_fix_delayed;
lastFixation.PosY = y_fix_delayed;
lastFixation.SampleType = sampleType;
lastFixation.StartTime = fix_start_time - trialStartTime;
lastFixation.SubjectName = (string)trialRow["SubjectName"];
lastFixation.TrialID = (int)trialRow["TrialID"];
lastFixation.TrialSequence = (int)trialRow["TrialSequence"];
fixations.Add(lastFixation);
}
// Save last FixCenter for Eliminating first Fix of new trial if choosen in UI
trialLastFixCenter.X = x_fix_delayed;
trialLastFixCenter.Y = y_fix_delayed;
if (this.mergeConsecutiveFixations)
{
// Look for consecutive fixations that are beneath each other
// (within GazeMaxDistance) because of
// miscalculation due to blinks or missing data.
List<Fixation> mergedFixations = new List<Fixation>();
if (fixations.Count > 1)
{
Fixation foregoingFixation = fixations[0];
bool merged = false;
int mergedCounter = 0;
int consecutiveMerges = 0;
int trialFixCounter = 1;
PointF foregoingFixationCenter = new PointF(foregoingFixation.PosX, foregoingFixation.PosY);
for (int i = 1; i < fixations.Count; i++)
{
// Test if consecutive calculated fixations lie in GazeMaxDistanceRange
PointF fixationCenter = new PointF(fixations[i].PosX, fixations[i].PosY);
int distance = (int)VGPolyline.Distance(foregoingFixationCenter, fixationCenter);
if (distance < maxDistance)
{
long sumOfDuration = foregoingFixation.Length + fixations[i].Length;
foregoingFixation.PosX = (foregoingFixation.PosX * foregoingFixation.Length +
fixations[i].PosX * fixations[i].Length) / sumOfDuration;
foregoingFixation.PosY = (foregoingFixation.PosY * foregoingFixation.Length +
fixations[i].PosY * fixations[i].Length) / sumOfDuration;
foregoingFixation.Length = fixations[i].StartTime - foregoingFixation.StartTime + fixations[i].Length;
merged = true;
mergedCounter++;
consecutiveMerges++;
}
else
{
if (!merged)
{
foregoingFixation.CountInTrial = trialFixCounter;
mergedFixations.Add(foregoingFixation);
trialFixCounter++;
}
else
{
merged = false;
foregoingFixation.CountInTrial -= mergedCounter - 1;
foregoingFixation.CountInTrial = trialFixCounter;
mergedFixations.Add(foregoingFixation);
consecutiveMerges = 0;
trialFixCounter++;
}
foregoingFixation = fixations[i];
foregoingFixationCenter = fixationCenter;
}
}
if (!merged)
{
foregoingFixation.CountInTrial = trialFixCounter;
mergedFixations.Add(foregoingFixation);
trialFixCounter++;
}
}
else
{
mergedFixations = fixations;
}
foreach (Fixation fixationToSave in mergedFixations)
{
this.SaveFixationToTable(fixationToSave);
}
}
else
{
// Don not merge fixations, use the originals.
foreach (Fixation fixationToSave in fixations)
{
this.SaveFixationToTable(fixationToSave);
}
}
// increase TrialCounter
counterTrial++;
if (worker != null)
{
if (worker.CancellationPending)
{
e.Cancel = true;
break;
}
else
{
// Report progress as a percentage of the total task.
int percentComplete = Convert.ToInt32(Convert.ToSingle(counterTrial) / trialsTable.Rows.Count * 100);
worker.ReportProgress(percentComplete);
}
}
// End Trial Loop
}
// Save Data to MDF File
this.WriteToMDF(sampleType);
}
/// <summary>
/// Calculates fixations from raw data and writes them into
/// the database in the fixations tables.
/// </summary>
/// <param name="sampleType">The <see cref="SampleType"/> of the data, gaze or mouse</param>
/// <param name="subject">A <see cref="String"/> with the subject name</param>
/// <param name="trialsTable">The database trials <see cref="DataTable"/></param>
/// <param name="worker">The <see cref="BackgroundWorker"/> of the calculation</param>
/// <param name="e">The <see cref="DoWorkEventArgs"/> of the <see cref="BackgroundWorker"/></param>
public void CalcFixations(
SampleType sampleType,
string subject,
System.Data.DataTable trialsTable,
BackgroundWorker worker,
DoWorkEventArgs e)
{
// Fixation Calculating Objects //////////////////////////////////////////
FixationDetection objFixationDetection = new FixationDetection();
// Instantiate the delegate using the method as a parameter
GetDataDelegate getDataMethod = null;
int minSamples = 0;
int maxDistance = 0;
if (sampleType == (sampleType | SampleType.Gaze))
{
getDataMethod = Queries.GetGazeData;
minSamples = this.gazeMinSamples;
maxDistance = this.gazeMaxDistance;
}
else if (sampleType == (sampleType | SampleType.Mouse))
{
getDataMethod = Queries.GetMouseData;
minSamples = this.mouseMinSamples;
maxDistance = this.mouseMaxDistance;
}
bool point_found_delayed;
/* sample gazepoint-found flag, */
/* min_fix_samples ago */
float x_delayed; /* sample gazepoint coordinates, */
float y_delayed; /* min_fix_samples ago */
float deviation_delayed;
/* deviation of the gaze from the */
/* present fixation, */
/* min_fix_samples ago */
/* Fixation data - delayed: */
float x_fix_delayed = new float(); /* fixation point as estimated */
float y_fix_delayed = new float(); /* min_fix_samples ago */
int saccade_duration_delayed;
/* duration of the saccade */
/* preceeding the preset fixation */
/* (samples) */
long fix_start_time = new long();
int fix_duration_delayed_samples = new int(); /* duration of the present fixation */
long fix_duration_delayed_milliseconds = new long(); /* duration of the present fixation */
EyeMotionState currentState = new EyeMotionState();
// OtherVars
int counterTrial = 0;
PointF trialLastFixCenter = new PointF(0, 0);
// Loop Rows=Trials
foreach (DataRow trialRow in trialsTable.Rows)
{
List <Fixation> fixations = new List <Fixation>();
// Reinitialize Fixation detection object
// to ensure no overlay between fixations of
// trials that follow each other.
objFixationDetection.InitFixation(minSamples);
int trialID = (int)trialRow["TrialID"];
int trialSequence = (int)trialRow["TrialSequence"];
// Holds RawData corresponding to selected trial and subject
DataTable rawDataTable = Queries.GetRawDataBySubjectAndTrialSequence(subject, trialSequence);
long trialStartTime = rawDataTable.Rows.Count > 0 ? (long)rawDataTable.Rows[0]["Time"] : 0;
int counterRows = 0;
int counterFix = 0;
bool isFixation = false;
// Loop RawData
foreach (DataRow rowRaw in rawDataTable.Rows)
{
PointF? newPt;
SampleValidity isValidData = getDataMethod(
rowRaw,
Document.ActiveDocument.PresentationSize,
out newPt);
bool useSample = false;
switch (isValidData)
{
case SampleValidity.Valid:
useSample = true;
break;
case SampleValidity.Empty:
useSample = true;
break;
case SampleValidity.Null:
break;
case SampleValidity.OutOfStimulus:
useSample = true;
break;
}
if (useSample)
{
PointF dataPoint = newPt.Value;
currentState = objFixationDetection.DetectFixation(
dataPoint.IsEmpty ? false : true,
Convert.ToInt64(rowRaw[3]),
dataPoint.X,
dataPoint.Y,
maxDistance,
minSamples,
out point_found_delayed,
out x_delayed,
out y_delayed,
out deviation_delayed,
out x_fix_delayed,
out y_fix_delayed,
out saccade_duration_delayed,
out fix_start_time,
out fix_duration_delayed_milliseconds,
out fix_duration_delayed_samples);
switch (currentState)
{
case EyeMotionState.FIXATING:
if (!isFixation)
{
isFixation = true;
}
break;
case EyeMotionState.FIXATION_COMPLETED:
PointF fixationCenter = new PointF(x_fix_delayed, y_fix_delayed);
// if (!Queries.OutOfScreen(fixationCenter)) TODO
{
Fixation completedFixation = new Fixation();
completedFixation.CountInTrial = counterFix + 1;
completedFixation.Length = fix_duration_delayed_milliseconds;
completedFixation.PosX = x_fix_delayed;
completedFixation.PosY = y_fix_delayed;
completedFixation.SampleType = sampleType;
completedFixation.StartTime = fix_start_time - trialStartTime;
completedFixation.SubjectName = (string)trialRow["SubjectName"];
completedFixation.TrialID = (int)trialRow["TrialID"];
completedFixation.TrialSequence = (int)trialRow["TrialSequence"];
if (this.eliminateFirstFixation && this.eliminateFirstFixationSimple == false && counterFix == 0 && VGPolyline.Distance(fixationCenter, trialLastFixCenter) < maxDistance && fix_duration_delayed_milliseconds < this.limitForFirstFixation)
{
// Eliminate if applicable
}
else if (this.eliminateFirstFixationSimple && counterFix == 0)
{
// do nothing, just go on with the next fixation eliminating this one
counterFix++;
}
else
{
fixations.Add(completedFixation);
counterFix++;
}
}
isFixation = false;
break;
case EyeMotionState.ERROR:
break;
default:
break;
}
}
counterRows++;
// End RawData Loop
}
// Save last Fix if it has not been saved by a following saccade
if (isFixation && fix_duration_delayed_milliseconds > 0)
{
Fixation lastFixation = new Fixation();
lastFixation.CountInTrial = counterFix + 1;
lastFixation.Length = fix_duration_delayed_milliseconds;
lastFixation.PosX = x_fix_delayed;
lastFixation.PosY = y_fix_delayed;
lastFixation.SampleType = sampleType;
lastFixation.StartTime = fix_start_time - trialStartTime;
lastFixation.SubjectName = (string)trialRow["SubjectName"];
lastFixation.TrialID = (int)trialRow["TrialID"];
lastFixation.TrialSequence = (int)trialRow["TrialSequence"];
fixations.Add(lastFixation);
}
// Save last FixCenter for Eliminating first Fix of new trial if choosen in UI
trialLastFixCenter.X = x_fix_delayed;
trialLastFixCenter.Y = y_fix_delayed;
if (this.mergeConsecutiveFixations)
{
// Look for consecutive fixations that are beneath each other
// (within GazeMaxDistance) because of
// miscalculation due to blinks or missing data.
List <Fixation> mergedFixations = new List <Fixation>();
if (fixations.Count > 1)
{
Fixation foregoingFixation = fixations[0];
bool merged = false;
int mergedCounter = 0;
int consecutiveMerges = 0;
int trialFixCounter = 1;
PointF foregoingFixationCenter = new PointF(foregoingFixation.PosX, foregoingFixation.PosY);
for (int i = 1; i < fixations.Count; i++)
{
// Test if consecutive calculated fixations lie in GazeMaxDistanceRange
PointF fixationCenter = new PointF(fixations[i].PosX, fixations[i].PosY);
int distance = (int)VGPolyline.Distance(foregoingFixationCenter, fixationCenter);
if (distance < maxDistance)
{
long sumOfDuration = foregoingFixation.Length + fixations[i].Length;
foregoingFixation.PosX = (foregoingFixation.PosX * foregoingFixation.Length +
fixations[i].PosX * fixations[i].Length) / sumOfDuration;
foregoingFixation.PosY = (foregoingFixation.PosY * foregoingFixation.Length +
fixations[i].PosY * fixations[i].Length) / sumOfDuration;
foregoingFixation.Length = fixations[i].StartTime - foregoingFixation.StartTime + fixations[i].Length;
merged = true;
mergedCounter++;
consecutiveMerges++;
}
else
{
if (!merged)
{
foregoingFixation.CountInTrial = trialFixCounter;
mergedFixations.Add(foregoingFixation);
trialFixCounter++;
}
else
{
merged = false;
foregoingFixation.CountInTrial -= mergedCounter - 1;
foregoingFixation.CountInTrial = trialFixCounter;
mergedFixations.Add(foregoingFixation);
consecutiveMerges = 0;
trialFixCounter++;
}
foregoingFixation = fixations[i];
foregoingFixationCenter = fixationCenter;
}
}
if (!merged)
{
foregoingFixation.CountInTrial = trialFixCounter;
mergedFixations.Add(foregoingFixation);
trialFixCounter++;
}
}
else
{
mergedFixations = fixations;
}
foreach (Fixation fixationToSave in mergedFixations)
{
this.SaveFixationToTable(fixationToSave);
}
}
else
{
// Don not merge fixations, use the originals.
foreach (Fixation fixationToSave in fixations)
{
this.SaveFixationToTable(fixationToSave);
}
}
// increase TrialCounter
counterTrial++;
if (worker != null)
{
if (worker.CancellationPending)
{
e.Cancel = true;
break;
}
else
{
// Report progress as a percentage of the total task.
int percentComplete = Convert.ToInt32(Convert.ToSingle(counterTrial) / trialsTable.Rows.Count * 100);
worker.ReportProgress(percentComplete);
}
}
// End Trial Loop
}
// Save Data to MDF File
this.WriteToMDF(sampleType);
}
