vect.cpp

// vector.cpp -- methods for Vector class
#include <cmath>
#include "vect.h"
using std::sin;
using std::cos;
using std::atan2;
using std::cout;

namespace VECTOR
{
	const double Rad_to_deg = 57.2957795130823;

	void Vector::set_mag()
	{
		mag - sqrt(x * x  + y * y);
	}

	void Vector::set_ang()
	{
		if (x == 0.0 && y == 0.0) {
			ang = 0.0;
		} else {
			ang = atan2(y, x);
		}
	}

	void Vector::set_x()
	{
		x = mag * cos(ang);
	}

	void Vector::set_y()
	{
		y = mag * sin(ang);
	}

	Vector::Vector()
	{
		x = y = mag = ang = 0.0;
		mode = 'r';
	}

	Vector::Vector(double n1, double n2, char form)
	{
		mode = form;
		if (form == 'r') {
			x = n1;
			y = n2;
			set_mag();
			set_ang();
		} else if (form == 'p') {
			mag = n1;
			ang = n2 / Rad_to_deg;
			set_x();
			set_y();
		} else {
			cout <<  "Incorrect 3rd argument to Vector() -- ";
			cout << "vector set to 0\n";
			x = y = mag = ang = 0.0;
			mode = 'r';
		}
	}

	void Vector::set(double n1, double n2, char form)
	{
		mode = form;
		if (form == 'r')
		{
			x = n1;
			y = n2;
			set_mag();
			set_ang();
		} else if (form == 'p') {
			mag = n1;
			ang = n2 / Rad_to_deg;
			set_x();
			set_y();
		} else {
			cout << "Incorrect 3rd argument to Vector() --";
			cout << "vector set to 0\n";
			x = y = mag = ang = 0.0;
			mode = 'r';
		}
	}

	Vector::~Vector()
	{

	}

	void Vector::polar_mode()
	{
		mode = 'p';
	}

	void Vector::rect_mode()
	{
		mode = 'r';
	}

	Vector Vector::operator+ (const Vector & b) const
	{
		return Vector(x + b.x, y + b.y);
	}

	Vector Vector::operator- (const Vector & b) const
	{
		return Vector(x - b.x, y - b.y);
	}

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

	Vector Vector::operator* (double n) const
	{
		return Vector(n * x, n * y);
	}

	Vector operator* (double n, const Vector & a)
	{
		return a * n;
	}

	std::ostream & operator<< (std::ostream & os, const Vector & v)
	{
		if (v.mode == 'r') {
			os << " (x, y) = (" << v.x << ", " << v.y << ")";
		} else if (v.mode == 'p') {
			os << " (m, a) = (" << v.mag << ", " << v.ang * Rad_to_deg << ") ";
		} else {
			os << "Vector object mode is invalid";
		}
		return os;
	}

}