internal static Movement Create(TouchPoint previous, TouchPoint current)
{
Movement movement = new Movement();
if (previous == null)
{
movement.Direction = MovementDirection.New;
movement.XMovement = 0;
movement.YMovement = 0;
movement.InactiveMillis = 0;
}
else
{
movement.XMovement = current.FocalPointX - previous.FocalPointX;
// Y is flipped because positive needs to be UP
movement.YMovement = previous.FocalPointY - current.FocalPointY;
// Add last 1 if it didn't break threshold
if (previous.Movement != null && previous.Movement.Magnitude < MOVEMENT_THRESHOLD)
{
movement.XMovement += previous.Movement.XMovement;
movement.YMovement += previous.Movement.YMovement;
movement.InactiveMillis = previous.Movement.InactiveMillis;
}
movement.Magnitude = previous.DistanceTo(current);
if (movement.Magnitude >= MOVEMENT_THRESHOLD)
{
movement.Direction = movement.FindDirection();
}
else
{
movement.Direction = MovementDirection.None;
movement.InactiveMillis += TouchMouse.SAMPLING_RATE;
}
}
return movement;
}
internal void CreateMovement(TouchPoint previousPoint)
{
if (previousPoint != null)
{
previousPoint.HasBeenFollowed = true;
}
if (previousPoint != null && previousPoint.Movements != null)
{
Movements = previousPoint.Movements;
}
else
{
Movements = new List<Movement>();
}
Movement = Movement.Create(previousPoint, this);
if (Movement.Direction != MovementDirection.None && Movement.Direction != MovementDirection.New)
{
Movements.Add(Movement);
}
}
internal double DistanceTo(TouchPoint otherPoint)
{
return MathHelpers.PythagoreanDistance(FocalPointX - otherPoint.FocalPointX, FocalPointY - otherPoint.FocalPointY);
}
internal static TouchPoint Create(int x, int y)
{
TouchPoint touchPoint = new TouchPoint()
{
Top = y,
Bottom = y,
Left = x,
Right = x,
FocalPointX = x,
FocalPointY = y,
};
return touchPoint;
}