vec3.cpp

#include "stdafx.h"
#include "vec3.h"
#include <math.h>
#include <stdlib.h>
#include <iostream>


vec3::vec3() {};
vec3::vec3(float e0, float e1, float e2)
{
	e[0] = e0;
	e[1] = e1;
	e[2] = e2;
}

float vec3::x() const
{
	return e[0];
}

float vec3::y() const
{
	return e[1];
}

float vec3::z() const
{
	return e[2];
}

float vec3::r() const
{
	return e[0];
}

float vec3::g() const
{
	return e[1];
}

float vec3::b() const
{
	return e[2];
}

const vec3& vec3::operator+() const
{
	return *this;
}

vec3 vec3::operator-() const
{
	return vec3(-e[0], -e[1], -e[2]);
}

float vec3::operator[](int i) const
{
	return e[i];
}

float& vec3::operator[](int i)
{
	return e[i];
}

vec3& vec3::operator+=(const vec3& v2)
{
	e[0] += v2.e[0];
	e[1] += v2.e[1];
	e[2] += v2.e[2];
	return *this;
}

vec3& vec3::operator-=(const vec3& v2)
{
	e[0] -= v2.e[0];
	e[1] -= v2.e[1];
	e[2] -= v2.e[2];
	return *this;
}

vec3& vec3::operator*=(const vec3& v2)
{
	e[0] *= v2.e[0];
	e[1] *= v2.e[1];
	e[2] *= v2.e[2];
	return *this;
}

vec3& vec3::operator*=(const float t)
{
	e[0] *= t;
	e[1] *= t;
	e[2] *= t;
	return *this;
}

vec3& vec3::operator/=(const vec3& v2)
{
	e[0] /= v2.e[0];
	e[1] /= v2.e[1];
	e[2] /= v2.e[2];
	return *this;
}

vec3& vec3::operator/=(const float t)
{
	e[0] /= t;
	e[1] /= t;
	e[2] /= t;
	return *this;
}


float vec3::length() const
{
	return sqrt(e[0] * e[0] + e[1] * e[1] + e[2] * e[2]);
}

float vec3::squared_length() const
{
	return e[0] * e[0] + e[1] * e[1] + e[2] * e[2];
}

void vec3::make_unit_vector()
{
	float k = 1.0 / sqrt(e[0] * e[0] + e[1] * e[1] + e[2] * e[2]);
	e[0] *= k;
	e[1] *= k;
	e[2] *= k;
}


std::istream& operator>>(std::istream &is, vec3 &t) {
	is >> t.e[0] >> t.e[1] >> t.e[2];
	return is;
}

std::ostream& operator<<(std::ostream& os, const vec3& t)
{
	os << t.e[0] << " " << t.e[1] << " "  << t.e[2];
	return os;
}

vec3 operator+(const vec3& v1, const vec3& v2)
{
	return vec3(
		v1.e[0] + v2.e[0],
		v1.e[1] + v2.e[1],
		v1.e[2] + v2.e[2]
	);
}

vec3 operator-(const vec3& v1, const vec3& v2)
{
	return vec3(
		v1.e[0] - v2.e[0],
		v1.e[1] - v2.e[1],
		v1.e[2] - v2.e[2]
	);
}

vec3 operator*(const vec3& v1, const vec3& v2)
{
	return vec3(
		v1.e[0] * v2.e[0],
		v1.e[1] * v2.e[1],
		v1.e[2] * v2.e[2]
	);
}

vec3 operator*(float t, const vec3& v)
{
	return vec3(
		v.e[0] * t,
		v.e[1] * t,
		v.e[2] * t
	);
}

vec3 operator*(const vec3& v, float t)
{
	return t*v;
}

vec3 operator/(const vec3& v1, const vec3& v2)
{
	return vec3(
		v1.e[0] / v2.e[0],
		v1.e[1] / v2.e[1],
		v1.e[2] / v2.e[2]
	);
}

vec3 operator/(const vec3& v, float t)
{
	return vec3(
		v.e[0] / t,
		v.e[1] / t,
		v.e[2] / t
	);
}

float dot(const vec3& v1, const vec3& v2)
{
	return v1.e[0]*v2.e[0] + v1.e[1]*v2.e[1] + v1.e[2]*v2.e[2];
}

vec3 cross(const vec3& v1, const vec3& v2)
{
	return vec3(
		(v1.e[1] * v2.e[2] - v1.e[2] * v2.e[1]),
		(-(v1.e[0] * v2.e[2] - v1.e[2] * v2.e[0])),
		(v1.e[0] * v2.e[1] - v1.e[1] * v2.e[0])
	);
}


vec3 unit_vector(vec3 v)
{
	return v / v.length();
}