#define SPACE_VECTOR_H_
#include <algorithm>
+#include <cmath>
#include <ostream>
#include <SDL.h>
template<class Other>
constexpr Vector(Vector<Other> other) : x(other.x), y(other.y) { }
+ static Vector<Scalar> FromPolar(Scalar rad, Scalar az) {
+ return Vector<Scalar>(rad * std::cos(az), rad * std::sin(az));
+ }
+
+ static constexpr Vector<Scalar> unit45 = Vector<Scalar>(-0.7071, 0.7071);
+
public:
Vector<Scalar> &operator +=(Vector<Scalar> other) {
x += other.x;
};
+template<class T>
+constexpr Vector<T> Vector<T>::unit45;
+
/// specialization with same layout as SDL_Point
template<>
class Vector<int>
}
+template<class Scalar>
+constexpr Scalar Dot(Vector<Scalar> lhs, Vector<Scalar> rhs) {
+ return (lhs.x * rhs.x) + (lhs.y * rhs.y);
+}
+template<class Scalar>
+constexpr Scalar Length(Vector<Scalar> v) {
+ return std::sqrt(Dot(v, v));
+}
+
+template<class Scalar>
+constexpr Vector<Scalar> Rotate90(Vector<Scalar> v) {
+ return Vector<Scalar>(-v.y, v.x);
+}
+template<class Scalar>
+constexpr Vector<Scalar> Rotate180(Vector<Scalar> v) {
+ return -v;
+}
+template<class Scalar>
+constexpr Vector<Scalar> Rotate270(Vector<Scalar> v) {
+ return Vector<Scalar>(v.y, -v.x);
+}
+
+
template<class Scalar>
inline std::ostream &operator <<(std::ostream &out, Vector<Scalar> v) {
return out << '<' << v.x << ',' << v.y << '>';