/// <summary>
/// switches state on the basis of min max fixation times and min max saccade time
/// during fixation state(slow) it wil stay in that state until maximum fixation is not reached. After the maximum fixation
/// value is achieved state machine switches to saccade(fast), it will stay in that state with 50% chance on every step.
/// </summary>
private void SwitchState()
{
if (ContinousFixationTime > fixationMax)
{
currentState = GazeMovementState.fast;
ContinousFixationTime = 0;
}
else if (ContinousFixationTime < fixationMin && ContinousSaccadeTime == 0)
{
currentState = GazeMovementState.slow;
}
else if (ContinousSaccadeTime > 0 && ContinousSaccadeTime < 90)// limiting time of saccade between greater than 0 ms and less than 90 ms
{
float r = GetRandomNumber(0, 100);
if (r < 50)// 50% chance that saccade keep on happening
{
currentState = GazeMovementState.fast;
ContinousFixationTime = 0;
}
else
{
currentState = GazeMovementState.slow;
ContinousFixationTime = 0;
ContinousSaccadeTime = 0;
}
}
}
public Generator(float duration, float fixationMin, float fixationMax, float saccadeMin, float saccadeMax, float tempoaralRes, float resX, float resY, float distPartcipantScreen, float disaplaySize)
{
this.duration = duration;
this.fixationMin = fixationMin;
this.fixationMax = fixationMax;
this.saccadeMin = saccadeMin;
this.saccadeMax = saccadeMax;
this.tempoaralRes = tempoaralRes;
this.resX = resX;
this.resY = resY;
this.distPartcipantScreen = distPartcipantScreen;
this.disaplaySize = disaplaySize;
degPerPixel = RadianToDegree((float)Math.Atan2(0.5f * disaplaySize, distPartcipantScreen)) / (0.5f * resY);// degree per pixel calculation
currentState = GazeMovementState.none;
ContinousFixationTime = 0;
ContinousSaccadeTime = 0;
minDegreeForFixation = 1;
maxDegreeForFixation = 5;
totalDataPoints = (int)(duration * tempoaralRes);
minFixationPix = ((1 / degPerPixel) * minDegreeForFixation) / totalDataPoints; // min distance that can be covered in pixels during fixation
maxFixationPix = ((1 / degPerPixel) * maxDegreeForFixation) / totalDataPoints; // max distance that can be covered in pixels during fixation
}
