X-Git-Url: https://git.localhorst.tv/?a=blobdiff_plain;ds=sidebyside;f=src%2Fgraphics%2FVector.h;h=97dfd4ac70662c4a22eada8982bb116fbc8f89b3;hb=501ffe20da16eaab69e668871001f735697c4a42;hp=b5c6d7d11dd9f9452c0a65b781a511b8fa9603ad;hpb=61c2d30a60d586cbe63885885c6a373c7713af1e;p=space.git

diff --git a/src/graphics/Vector.h b/src/graphics/Vector.h
index b5c6d7d..97dfd4a 100644
--- a/src/graphics/Vector.h
+++ b/src/graphics/Vector.h
@@ -2,7 +2,9 @@
 #define SPACE_VECTOR_H_
 
 #include <algorithm>
+#include <cmath>
 #include <ostream>
+#include <SDL.h>
 
 
 namespace space {
@@ -17,6 +19,12 @@ public:
 	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;
@@ -29,12 +37,53 @@ public:
 		return *this;
 	}
 
+	SDL_Point ToPoint() const {
+		SDL_Point p;
+		p.x = x;
+		p.y = y;
+		return p;
+	}
+
 public:
 	Scalar x;
 	Scalar y;
 
 };
 
+template<class T>
+constexpr Vector<T> Vector<T>::unit45;
+
+/// specialization with same layout as SDL_Point
+template<>
+class Vector<int>
+: public SDL_Point {
+
+public:
+	constexpr Vector() : SDL_Point({0, 0}) { }
+	constexpr Vector(int x, int y) : SDL_Point({x, y}) { }
+
+	template<class Other>
+	constexpr Vector(Vector<Other> other)
+	: SDL_Point({int(other.x), int(other.y)}) { }
+
+public:
+	Vector<int> &operator +=(Vector<int> other) {
+		x += other.x;
+		y += other.y;
+		return *this;
+	}
+	Vector<int> &operator -=(Vector<int> other) {
+		x -= other.x;
+		y -= other.y;
+		return *this;
+	}
+
+	SDL_Point ToPoint() const {
+		return *this;
+	}
+
+};
+
 
 template<class Scalar>
 constexpr Vector<Scalar> operator -(Vector<Scalar> v) {
@@ -93,6 +142,37 @@ constexpr bool operator !=(Vector<Scalar> lhs, Vector<Scalar> rhs) {
 }
 
 
+template<class Scalar>
+constexpr Scalar Cross2D(Vector<Scalar> lhs, Vector<Scalar> rhs) {
+	return (lhs.x * rhs.y) - (lhs.y * rhs.x);
+}
+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> Norm(Vector<Scalar> v) {
+	return v / Length(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 << '>';