vec3.h

/*
 *  vec3.h
 */

#ifndef VEC3_H
#define VEC3_H

#include <iostream> /* Included for output to stdout.                     */
#include <assert.h> /* Included to assert if arguments are valid.         */
#include "vec4.h"

#define EPSILON 0.00000001 /* Amount of tolerance for is equal operators. */

class vec4;

class vec3
{
	private:

		float data[3];
	
	public:
	
		/****************/
		/* Constructors */
		/****************/
		/* Defaults all value to 0. */
		vec3();
		/* Converts the given vec4 to a vec3. */
		vec3(vec4 v4);
		/* Set the values of this vector to the given floats. */
		vec3(float x, float y, float z);
		
		/*********************/
		/* Getters & Setters */
		/*********************/
		/* Returns the value at index. */
		float operator[](unsigned int index) const;
	
		/* Returns a reference to the value at index. */
		float& operator[](unsigned int index);
		
		/**********************/
		/* Display the Vector */
		/**********************/
		/* Prints the vector to standard output in a nice format. */
		void print();
	
		/*********************/
		/* Vector Operations */
		/*********************/
		/* Returns the geometric length of the vector. */
		float length() const;
		
		/** Friend Functions **/	
		
		/* Checks if v1 == v2 */
		friend bool operator==(const vec3& v1, const vec3& v2);
	
		/* Checks if v1 != v2 */
		friend bool operator!=(const vec3& v1, const vec3& v2);
	
		/* Vector Addition (v1 + v2) */
		friend vec3 operator+ (const vec3& v1, const vec3& v2);
	
		/* Vector Subtraction (v1 - v2) */
		friend vec3 operator- (const vec3& v1, const vec3& v2);
	
		/* Scalar Multiplication (v * c) */
		friend vec3 operator* (const vec3& v, float c);	
	
		/* Scalar Multiplication (c * v) */
		friend vec3 operator* (float c, const vec3& v);
	
		/* Scalar Division (v/c) */
		friend vec3 operator/ (const vec3& v, float c);
	
		/* Dot Product (v1 * v2) */
		friend float operator* (const vec3& v1, const vec3& v2);
	
		/* Cross Product (v1 % v2) */
		friend vec3 operator% (const vec3& v1, const vec3& v2);

		friend class vec4;
};

#endif