/// <summary>
/// This static method calculates the sum of fixation connections,
/// which is a gaze path length.
/// </summary>
/// <param name="fixationTable">A <see cref="DataTable"/> with the fixations
/// to use.</param>
/// <returns>A <see cref="Single"/> with the path length in pixel.</returns>
private static float CalcPathLengthOfFixationConnections(DataTable fixationTable)
{
// Fixation PathLength
// no fixation available
float pathLengthGaze = -1f;
VGPolyline polylineGaze = new VGPolyline(ShapeDrawAction.Edge, Pens.Green);
foreach (DataRow row in fixationTable.Rows)
{
float gazeX = !row.IsNull("PosX") ? Convert.ToSingle(row["PosX"]) : 0;
float gazeY = !row.IsNull("PosY") ? Convert.ToSingle(row["PosY"]) : 0;
if (gazeX != 0 || gazeY != 0)
{
polylineGaze.AddPt(new PointF(gazeX, gazeY));
}
}
if (polylineGaze.GetPointCount() >= 2)
{
// Connections available
pathLengthGaze = polylineGaze.GetLength();
}
else if (polylineGaze.GetPointCount() == 1)
{
// Only one fixation, so no connections
pathLengthGaze = 0;
}
return pathLengthGaze;
}
/// <summary>
/// This static method calculates the raw data related variables as there
/// are distance of gaze and mouse path along with loss and out of
/// monitor values.
/// </summary>
/// <param name="subjectName">A <see cref="string"/> with the subject name.</param>
/// <param name="trialSequence">An <see cref="int"/> with the trial sequence number.</param>
/// <param name="countBlinkLoss">Ref. Counts the samples the are lost due to blinks.</param>
/// <param name="countOutOfMonitorLoss">Ref. Counts the samples the are lost due to out of monitor samples.</param>
/// <param name="pathLengthMouse">Ref. Returns the path length of the mouse path.</param>
/// <param name="averageDistance">Ref. Returns the average distance of gaze and mouse path in pixel.</param>
/// <param name="countSamples">Ref. Counts the number of samples.</param>
private static void CalcRawDataRelatedVariables(
string subjectName,
int trialSequence,
ref int countBlinkLoss,
ref int countOutOfMonitorLoss,
ref float pathLengthMouse,
ref float averageDistance,
ref int countSamples)
{
// Get RawData
DataTable rawDataTable =
Queries.GetRawDataBySubjectAndTrialSequenceWithoutEvents(subjectName, trialSequence);
// In this section only mouse polyline is created,
// because the gaze path length is calculated as the
// distance between fixations to avoid
// including microsaccade movements.
VGPolyline polylineMouse = new VGPolyline(ShapeDrawAction.Edge, Pens.Red);
float sumDistance = 0;
int distancesCount = 0;
// Loop RawData and drawPolyline
foreach (DataRow row in rawDataTable.Rows)
{
PointF? newGazePoint;
SampleValidity isGazeValidData = Queries.GetGazeData(
row,
Document.ActiveDocument.PresentationSize,
out newGazePoint);
switch (isGazeValidData)
{
case SampleValidity.Valid:
break;
case SampleValidity.Empty:
countBlinkLoss++;
break;
case SampleValidity.Null:
countBlinkLoss++;
break;
case SampleValidity.OutOfStimulus:
countOutOfMonitorLoss++;
break;
}
PointF? newMousePoint;
SampleValidity isMouseValidData = Queries.GetMouseData(
row,
Document.ActiveDocument.PresentationSize,
out newMousePoint);
switch (isMouseValidData)
{
case SampleValidity.Valid:
case SampleValidity.Empty:
case SampleValidity.OutOfStimulus:
// mouse is always detected and never out of screen
polylineMouse.AddPt(newMousePoint.Value);
break;
case SampleValidity.Null:
break;
}
// Calculate Distance of Gaze And Mouse Path
if (isGazeValidData == SampleValidity.Valid &&
(isMouseValidData == SampleValidity.Valid || isMouseValidData == SampleValidity.Empty))
{
sumDistance += VGPolyline.Distance(newGazePoint.Value, newMousePoint.Value);
distancesCount++;
}
}
if (polylineMouse.GetPointCount() >= 2)
{
pathLengthMouse = polylineMouse.GetLength();
}
else if (polylineMouse.GetPointCount() == 1)
{
pathLengthMouse = 0; // No Movement in MouseData
}
if (distancesCount > 0)
{
averageDistance = sumDistance / distancesCount;
}
else
{
averageDistance = -1;
}
countSamples = rawDataTable.Rows.Count;
rawDataTable.Dispose();
}