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/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527 */
/* without consent of either the College of William & Mary or */
/* Pieter Peers. */
/******************************************************************/
#ifndef _VEC2D_H_
#define _VEC2D_H_
#include <ostream>
#include <cmath>
class vec2d {
public:
/////////////
// Typedef //
/////////////
typedef float value_type;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef value_type* iterator;
typedef const value_type* const_iterator;
//////////////////
// Data Members //
//////////////////
union {
struct { value_type x, y; };
struct { value_type u, v; };
value_type data[2];
};
public:
/////////////////
// Constructor //
/////////////////
explicit vec2d(const_reference value=0.0f);
vec2d(const_reference x, const_reference y);
vec2d(const vec2d& v);
////////////////
// Inspectors //
////////////////
static size_t size(void) { return 2; }
iterator begin(void);
const_iterator begin(void) const;
iterator end(void);
const_iterator end(void) const;
const_reference operator[](size_t index) const;
reference operator[](size_t index);
///////////////
// Operators //
///////////////
vec2d& operator=(const vec2d& v);
bool operator==(const vec2d& v) const;
bool operator!=(const vec2d& v) const;
vec2d operator-(void) const;
vec2d operator+(const vec2d& v) const;
vec2d operator-(const vec2d& v) const;
vec2d operator*(const vec2d& v) const;
vec2d operator*(const_reference scale) const;
vec2d operator/(const vec2d& v) const;
vec2d operator/(const_reference scale) const;
vec2d& operator+=(const vec2d& v);
vec2d& operator-=(const vec2d& v);
vec2d& operator*=(const vec2d& v);
vec2d& operator*=(const_reference scale);
vec2d& operator/=(const vec2d& v);
vec2d& operator/=(const_reference scale);
/////////////
// Methods //
/////////////
value_type dot(const vec2d& v) const;
value_type squared_length(void) const;
value_type length(void) const;
value_type squared_distance(const vec2d& v) const;
value_type distance(const vec2d& v) const;
///////////////
// Modifiers //
///////////////
vec2d& abs(void);
vec2d& normalize(void);
/////////////
// Friends //
/////////////
friend void swap(vec2d& a, vec2d& b) { return a._swap(b); }
friend vec2d normalize(const vec2d& v) { return vec2d(v).normalize(); }
friend vec2d abs(const vec2d& v) { return vec2d(v).abs(); }
friend vec2d operator*(const_reference scale, const vec2d& v) { return (v*scale); }
friend std::ostream& operator<<(std::ostream& s, const vec2d& v)
{
s << "[" << v.x << "," << v.y << "]";
return s;
}
private:
/////////////////////
// Private Methods //
/////////////////////
void _assign(const vec2d& v);
void _swap(vec2d& v);
};
#endif /* _VEC2D_H_ */
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