private void CalculateOrthogonalDirectionChange(FittsCoordinate coord, FittsTrajectory trajectory)
{
List <double> totalDistanceDifference = new List <double>();
Vector2 firstPoint = new Vector2(trajectory.x[0], trajectory.y[0]);
double lastDistance = Vector2.Distance(coord.select, firstPoint);
bool distanceIsShorter = true;
for (int i = 0; i < trajectory.x.Count; i++)
{
double currentDistance = Vector2.Distance(coord.select, new Vector2(trajectory.x[i], trajectory.y[i]));
// Check to see if the trajectory continues in the same direction
if (distanceIsShorter == currentDistance <= lastDistance)
{
lastDistance = currentDistance;
// We clear the distance covered in new direction as not to add past difference to actual one
totalDistanceDifference.Clear();
continue;
}
// A new direction is chosen so we add up the distance covered in the new direction
// to record a MDC only if it reach a certain threshold
totalDistanceDifference.Add(currentDistance > lastDistance ? currentDistance - lastDistance : lastDistance - currentDistance);
// The threshold is reached
if (totalDistanceDifference.Sum() > threshold)
{
distanceIsShorter = currentDistance <= lastDistance;
totalDistanceDifference.Clear();
orthogonalDirectionChange++;
}
lastDistance = currentDistance;
}
}
public FittsTrial(FittsTime _time, FittsCoordinate _coord, bool isTouchingTarget, FittsTrajectory _trajectory)
{
time = _time;
coord = _coord;
trajectory = _trajectory;
isError = !isTouchingTarget;
}
public FittsSequence(SequenceParameter _parameter)
{
fittsTrials = new List <FittsTrial>();
parameter = _parameter;
trajectory = new FittsTrajectory();
isInTarget = false;
}
public bool AddTriggerEvent(Vector3 pos, FittsTime time, bool trialIsError)
{
// Check if first selection because it is not recorded
if (!TargetsCreator.IsFirstTarget())
{
AddTrial(pos, time, trialIsError);
}
// Start a new trajectory for the new target because each trial has his trajectory
trajectory = new FittsTrajectory();
return(parameter.nbOfTarget == fittsTrials.Count);
}
private void CreateDeltaYList(FittsCoordinate coord, FittsTrajectory trajectory)
{
// Contains the delta y from the controller trajectory and the projected line between from and select
deltaY = new List <double>();
// Ax + By + C = 0
float a = (coord.select.y - coord.from.y) / (coord.select.x - coord.from.x);
float b = -1;
float c = coord.select.y - coord.select.x * a;
// Fetch x and y coord of trajectory
var trajectoryCoords = trajectory.x.Zip(trajectory.y, (_x, _y) => new { x = _x, y = _y });
// Find each delta y for each trajectory coordinate
foreach (var trajCoord in trajectoryCoords)
{
deltaY.Add((a * trajCoord.x + b * trajCoord.y + c) / (Math.Sqrt(a * a + b * b)));
}
}
public FittsMovement(FittsCoordinate coord, FittsTrajectory trajectory)
{
threshold = 0.01f;
CreateDeltaYList(coord, trajectory);
// MO
movementOffset = deltaY.Sum() / trajectory.y.Count;
// ME
movementError = deltaY.Sum(y => Math.Abs(y)) / trajectory.y.Count;
// MV
movementVariable = Math.Sqrt(deltaY.Sum(y => Math.Pow(y - movementOffset, 2)) / (trajectory.x.Count - 1));
// TAC
CalculateTaskAxisCrossing();
// MDC
CalculateMovementDirectionChange();
// ODC
CalculateOrthogonalDirectionChange(coord, trajectory);
}
