// Need to return an array of List<Fixation>, and then calculate all features for each
// element (slice) of the fixations.
// We can either slice by: number of fixations or time period
/*
* private List<Slice> SliceFixations(List<Fixation> allFixations, int numberOfFixations) {
* // go through the array, keeping tracking of teh current count and adding each fixation to the current slide
* // when reach numberOfFixations, add current slice to array, then start a new slice
*
* List<Slice> slices = new List<Slice>();
* List<Fixation> currentSliceFixations = new List<Fixation>();
* RawToFixationConverter converter = new RawToFixationConverter();
*
* int count = 0;
*
* foreach(Fixation fixation in allFixations) {
*
* count++;
* currentSliceFixations.Add(fixation);
*
* if(count >= numberOfFixations) {
* Slice slice = new Slice();
*
* slice.fixations = currentSliceFixations;
* slice.saccades = converter.GenerateSaccades(currentSliceFixations);
*
* slices.Add(slice);
* currentSliceFixations = new List<Fixation>();
* }
* }
*
* return slices;
* }
*/
// number of slices = total time for fixations in ms / (timePeriod / 2)
private List <Slice> SliceFixations(List <Fixation> allFixations, double timePeriod, double step)
{
List <Slice> slices = new List <Slice>();
RawToFixationConverter converter = new RawToFixationConverter();
double windowStep = step; // This is window step size.
// increment some counter by halfTimePeriod until it is < length of all fixations - a single time period
Fixation finalFixation = allFixations.Last();
for (double start = 0; start < finalFixation.endTime - timePeriod; start += windowStep)
{
double windowStart = start;
double windowEnd = start + timePeriod;
// Get the fixations within this window
List <Fixation> fixationsInWindow = GetFixationsInTimePeriod(windowStart, windowEnd, allFixations);
// As long as there was at least 3 fixation in that window
if (fixationsInWindow.Count > 3)
{
// Create a new slice with those fixations.
Slice slice = new Slice();
slice.fixations = fixationsInWindow;
slice.saccades = converter.GenerateSaccades(fixationsInWindow);
slices.Add(slice);
}
}
return(slices);
}
// Fixations
private void DrawFixations()
{
RawToFixationConverter converter = new RawToFixationConverter(gazePoints);
List <Fixation> fixations = converter.CalculateFixations(currentWindowSize, (float)peakThreshold, (float)radius, 0); // don't clip any gazepoints when simply drawing
List <Saccade> saccades = converter.GenerateSaccades(fixations);
calculatedSaccades = saccades;
calculatedFixations = fixations;
foreach (Fixation fixation in fixations)
{
double lengthOfFixation = fixation.endTime - fixation.startTime;
double seconds = lengthOfFixation / 1000;
System.Windows.Media.SolidColorBrush brush = VSLocationBrushes[fixation.location];
DrawCircle(fixation.x, fixation.y, brush, fixationCircleSize, CircleType.FixationCircle);
DrawLabel(seconds.ToString(), fixation.x + fixationCircleSize, fixation.y, brush);
}
}