/*
   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() { return axis_vector[0]; }

	/// global coordinates of the Y-axis in the local coordinates system
	inline Vector3f const & left() { return axis_vector[1]; }
	
	/// global coordinates of the Z-axis in the local coordinates system
	inline Vector3f const & up() { return axis_vector[2]; }

	inline Vector3f const operator[](size_t index) { return axis_vector[index]; }

	Axis & operator=(const Axis & other);
		
	/// alter heading, rotate around Z-axis (positive is left)
	void direction(const float angle);

	/// alter heading, rotate around negative Y-axis (positive is up)
	void pitch(const float angle);

private:
	Vector3f		axis_vector[3];
};

}

#endif // __INCLUDED_MATH_AXIS_H__