public void ComputeCenter()
{
if (_current.Pixel > 0)
{
_current.ComputeCenter();
if (_previous.Pixel > 0)
{
var dX = _current.CenterX - _previous.CenterX;
var dY = _current.CenterY - _previous.CenterY;
Movement += Math.Sqrt(dX * dX + dY * dY);
}
}
}