Vector2 A;
	     Vector2 B;
	    A.X = currentMouseState.X;
            A.Y = currentMouseState.Y;
            B.X = Pg.Position.X;
            B.Y = Pg.Position.Y;

            Vector2 D = A - B;

            double AB = Math.Sqrt((D.X * D.X) + (D.Y * D.Y));
            float angle = (float)(Math.Asin(D.X/AB));

            angle = -(float)Math.Atan2(D.X, D.Y) + MathHelper.Pi;

poi angle si somma alla rotazione