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/*
   model/plane.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_MODEL_PLANE_H__
#define __INCLUDED_MODEL_PLANE_H__

#include <string>

#include "math/vector3f.h"

namespace model
{

/** @brief A class representing a plane in 3d space
 *  all points p(x, y, z) on the plane satisfy the general equation
 *  x*a() + y*b() + z*c() + d() = 0
 */
class Plane
{
public:
	/// a plane defined by 3 points in space
	Plane(math::Vector3f const & point0, math::Vector3f const &point1, math::Vector3f const &point2);
	/// copy constructor
	Plane(Plane const & other);

	/// normal of the plane, not normalized to lenght 1
	inline math::Vector3f const & normal() const { return plane_normal; }
	/// the points defining the plane. 
	/// @param i 0 <= i < 3
	inline math::Vector3f const & point(size_t i) const { return plane_point[i]; }
	/// plane texture 
	inline std::string & texture() { return plane_texture; }
	/// first parameter of the general equation
	inline float a() const { return plane_normal[0]; }
	/// second parameter of the general equation
	inline float b() const { return plane_normal[1]; }
	/// third param of the general equation
	inline float c() const { return plane_normal[2]; }
	/// fourth parameter of the general equation
	inline float d() const { return pd; }
	/// indidcates if this plane was generated from a detail brush
	inline bool & detail() { return plane_detail; }
	/// surface flags
	inline unsigned int & surface_flags() { return plane_surface_flags; }


private:
	math::Vector3f 		plane_point[3];
	math::Vector3f 		plane_normal;
	std::string		plane_texture;
	unsigned int		plane_surface_flags;
	bool			plane_detail;
	float 			pd;
};

}

#endif // __INCLUDED_MODEL_PLANE_H__