/* Copyright: (c) Kayne Ruse 2013
 * 
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * 
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 
 * 3. This notice may not be removed or altered from any source
 * distribution.
*/
#ifndef VECTOR2_HPP_
#define VECTOR2_HPP_

#include <stdexcept>
#include <cmath>

class Vector2 {
public:
	double x = 0, y = 0;
	Vector2() = default;
	Vector2(double i, double j) {
		x = i; y = j;
	}
	double Length() const {
		return sqrt(x*x+y*y);
	}
	double SquaredLength() const {
		return x*x+y*y;
	}

	double operator[](size_t i) {
		if (i >= 2)
			throw(std::runtime_error("Out of range"));
		return *(&x+i);
	}

	//Arithmetic operators
	Vector2 operator+(Vector2 v) const { return Vector2(x + v.x, y + v.y); }
	Vector2 operator-(Vector2 v) const { return Vector2(x - v.x, y - v.y); }
	Vector2 operator*(Vector2 v) const { return Vector2(x * v.x, y * v.y); }
	Vector2 operator*(double d) const { return Vector2(x * d, y * d); }

	Vector2 operator/(Vector2 v) {
		if (!v.x || !v.y)
			throw(std::runtime_error("Divide by zero"));
		return Vector2(x / v.x, y / v.y);
	}
	Vector2 operator/(double d) {
		if (!d)
			throw(std::runtime_error("Divide by zero"));
		return Vector2(x / d, y / d);
	}

	bool operator==(Vector2 v) { return (x == v.x && y == v.y); }
	bool operator!=(Vector2 v) { return (x != v.x || y != v.y); }

	//templates
	template<typename T> Vector2 operator+=(T t) { return *this = *this + t; }
	template<typename T> Vector2 operator-=(T t) { return *this = *this - t; }
	template<typename T> Vector2 operator*=(T t) { return *this = *this * t; }
	template<typename T> Vector2 operator/=(T t) { return *this = *this / t; }
	template<typename T> bool operator==(T t) { return (x == t && y == t); }
	template<typename T> bool operator!=(T t) { return (x != t || y != t); }
};

#endif