/*! \file piellipsoidmodel.h
 * \ingroup Geo
 * \~\brief
 * \~english Geographical ellipsoid Earth models
 * \~russian Географическая эллипсоидная модель Земли
 */
/*
    PIP - Platform Independent Primitives
    Contains geo ellipsoid models
    Andrey Bychkov work.a.b@yandex.ru

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef PIELLIPSOIDMODEL_H
#define PIELLIPSOIDMODEL_H


#include "pimathbase.h"

//! \~english Geographical ellipsoid Earth model
//! \~russian Географическая эллипсоидная модель Земли
class PIP_EXPORT PIEllipsoidModel {
public:
	//! \~english Default constructor
	//! \~russian Конструктор по умолчанию
	PIEllipsoidModel();

	//! \~english Get eccentricity squared
	//! \~russian Получить квадрат эксцентриситета
	double eccSquared() const { return eccentricity * eccentricity; }

	//! \~english Get semi-minor axis (b)
	//! \~russian Получить малую полуось (b)
	double b() const { return a * sqrt(1 - eccSquared()); }

	//! \~english WGS84 ellipsoid model
	//! \~russian Эллипсоид WGS84
	static PIEllipsoidModel WGS84Ellipsoid();

	//! \~english PZ90 ellipsoid model
	//! \~russian Эллипсоид ПЗ-90
	static PIEllipsoidModel PZ90Ellipsoid();

	//! \~english GPS ellipsoid (same as WGS84)
	//! \~russian Эллипсоид GPS (то же что WGS84)
	static PIEllipsoidModel GPSEllipsoid();

	//! \~english Krasovskiy ellipsoid model
	//! \~russian Эллипсоид Красовского
	static PIEllipsoidModel KrasovskiyEllipsoid();

	//! \~english Major semi-axis (meters)
	//! \~russian Большая полуось (метры)
	double a;

	//! \~english Flattening (f = (a-b)/a)
	//! \~russian Сплюснутость (f = (a-b)/a)
	double flattening;

	//! \~english First eccentricity
	//! \~russian Первый эксцентриситет
	double eccentricity;

	//! \~english Angular velocity (rad/sec)
	//! \~russian Угловая скорость (рад/сек)
	double angVelocity;
};


#endif // PIELLIPSOIDMODEL_H