Class v_2d

olcPixelGameEngine.h:624–773

	*/
	template<class T>
	struct v_2d
	{
		static_assert(std::is_arithmetic<T>::value, "olc::v_2d<type> must be numeric");

		// x-axis component
		T x = 0;
		// y-axis component
		T y = 0;

		// Default constructor
		inline constexpr v_2d() = default;

		// Specific constructor
		inline constexpr v_2d(T _x, T _y) : x(_x), y(_y)
		{}

		// Copy constructor
		inline constexpr v_2d(const v_2d& v) = default;

		// Assignment operator
		inline constexpr v_2d& operator=(const v_2d& v) = default;


		inline constexpr std::array<T, 2> a() const
		{
			return std::array<T, 2>{x, y};
		}

		// Returns rectangular area of vector
		inline constexpr auto area() const
		{
			return x * y;
		}

		// Returns magnitude of vector
		inline auto mag() const
		{
			return std::sqrt(x * x + y * y);
		}

		// Returns magnitude squared of vector (useful for fast comparisons)
		inline constexpr T mag2() const
		{
			return x * x + y * y;
		}

		// 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
		{
			return v_2d(-y, x);
		}