//
// Created by Иван Ильин on 10.10.2021.
//

#include <cmath>
#include "Vec2D.h"
#include "Consts.h"

Vec2D::Vec2D(const Vec2D &vec) {
    _arr_point[0] = vec.x();
    _arr_point[1] = vec.y();
}

Vec2D::Vec2D (double x, double y) {
    _arr_point[0] = x;
    _arr_point[1] = y;
}

Vec2D::Vec2D(const Vec4D &point4D) {
    _arr_point[0] = point4D.x();
    _arr_point[1] = point4D.y();
}

Vec2D Vec2D::operator-() const {
    return Vec2D(-x(), -y());
}

bool Vec2D::operator==(const Vec2D& vec) const {
    return (*this - vec).sqrAbs() < Consts::EPS;
}
bool Vec2D::operator!=(const Vec2D& vec) const {
    return !(*this == vec);
}

Vec2D Vec2D::operator+(const Vec2D& vec) const {
    return Vec2D(x()+vec.x(), y()+vec.y());
}
Vec2D Vec2D::operator-(const Vec2D& vec) const {
    return Vec2D(*this) + -vec;
}

Vec2D Vec2D::operator*(double number) const {
    return Vec2D(x()*number, y()*number);
}

Vec2D Vec2D::operator/(double number) const {
    if(std::abs(number) > Consts::EPS) {
        return Vec2D(*this) * (1.0 / number);
    } else {
        throw std::domain_error{"Vec2D::operator/(double number): division by zero"};
    }
}

// Other useful methods
double Vec2D::sqrAbs() const {
    return x()*x() + y()*y();
}

double Vec2D::abs() const {
    return sqrt(sqrAbs());
}

Vec2D Vec2D::normalized() const {
    double vecAbs = abs();
    if(vecAbs > Consts::EPS) {
        return Vec2D(*this) / abs();
    } else {
        return Vec2D(0);
    }
}

double Vec2D::dot(const Vec2D& vec) const {
    return vec.x() * x() + vec.y() * y();
}