Method norm

olcPixelGameEngine.h:671–675

Returns normalised version of vector

		// Returns normalised version of vector
		inline v_2d norm() const
		{
			auto r = 1 / mag();
			return v_2d(x * r, y * r);
		}

		// Returns vector at 90 degrees to this one
		inline constexpr v_2d perp() const