#include "vector.h"
#include <cmath>
#include <iostream>


Vector :: Vector(double x , double y )
{
	this->x= x;
	this->y= y;
}

void Vector:: add(Vector const & v)
{
	setX(getX() + v.getX());
	setY(getY() + v.getY());
}


Vector Vector::sum(Vector const & v) const
{
	return Vector(getX() + v.getX(), getY() + v.getY());
}

Vector Vector :: substract(Vector const & v) const
{
	return Vector(getX() - v.getX(), getY() - v.getY());
}

double Vector :: scalarProduct( Vector const & v) const
{
	return getX() * v.getX() + getY()* v.getY();
}

void Vector::productWithNumber( double c)
{
	setX(getX() * c);
	setY(getY() * c);
}

void Vector:: setX(  double _x)
{
	x = _x;
}

void Vector:: setY(  double _y)
{
	y= _y;
}

void Vector::normalize()
{
	if(! isNull())
	{
		double len = length();
		setX(getX() / len);
		setY(getY() / len);
	}
}

double Vector:: length() const 
{
	return sqrt( getX() * getX() + getY()* getY());
}

double Vector :: getX() const 
{
	return x;
}

double Vector :: getY() const 
{
	return y;
}

void Vector :: setVector( double a, double b)
{
	x= a;
	y= b;
}

void Vector::print() const
{
	std::cout<<'('<<x<<','<< y<<')'<<std::endl;
}

bool Vector :: isNull () const
{
	return getX() == getY() && getX() == 0.0;
}