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/*
math/axis.h
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
#ifndef __INCLUDED_MATH_AXIS_H__
#define __INCLUDED_MATH_AXIS_H__
#include <iostream>
#include "math/vector3f.h"
namespace math
{
/// a local coordinates system
class Axis {
public:
Axis();
Axis(const Axis & other);
void clear();
void assign(const Axis & other);
/// global coordinates of the X-axis in the local coordinates system
inline Vector3f const & forward() const { return axis_vector[0]; }
/// global coordinates of the Y-axis in the local coordinates system
inline Vector3f const & left() const { return axis_vector[1]; }
/// global coordinates of the Z-axis in the local coordinates system
inline Vector3f const & up() const { return axis_vector[2]; }
inline Vector3f & operator[](size_t index) { return axis_vector[index]; }
inline Vector3f const & operator[](size_t index) const { return axis_vector[index]; }
Axis & operator=(const Axis & other);
/// change direction, rotate around up vector (positive is left)
void change_direction(const float angle);
/// change pitch, rotate around left vector (positive is up)
void change_pitch(const float angle);
/// change roll, rotate around forward vector (positive is left)
void change_roll(const float angle);
/// rotation about an arbitrary axis
void rotate(Vector3f const &normal, float angle);
private:
Vector3f axis_vector[3];
};
/// write an axis to a std::ostream
std::ostream &operator<<(std::ostream & os, Axis const & axis);
/// read an axis from a std::istream
std::istream &operator>>(std::istream & is, Axis & axis);
/// local-to-global coordinates
Vector3f operator*(Axis const &axis, Vector3f const &vector);
}
#endif // __INCLUDED_MATH_AXIS_H__
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