private void CalculateRotation(Vector2 difference)
{
Vector2.Normalize(ref difference, out _normalizedDifference);
Vector2.Dot(ref _xVector, ref _normalizedDifference, out _theta);
_theta = Calculator.ACos(_theta);
if (difference.Y < 0)
{
_theta = -_theta;
}
_rotation = _theta;
}
