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//  Transmission.h - a gearbox for the drivetrain.

//

//  Copyright (C) 2001--2004 Sam Varner

//

//  This file is part of Vamos Automotive Simulator.

//

//  Vamos is free software: you can redistribute it and/or modify

//  it under the terms of the GNU General Public License as published by

//  the Free Software Foundation, either version 3 of the License, or

//  (at your option) any later version.

//  

//  Vamos 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 General Public License for more details.

//  

//  You should have received a copy of the GNU General Public License

//  along with Vamos.  If not, see <http://www.gnu.org/licenses/>.



#ifndef _TRANSMISSION_H_

#define _TRANSMISSION_H_



#include <map>



namespace Vamos_Body

{

  //* A gearbox for the drivetrain.

  class Transmission

  {

	// A map of gears to gear ratios.  Neutral has a key of 0.

	// Reverse gears have negative keys.

	std::map <int, double> m_gear_ratios;



	// The number of consecutive forward gears.  Any non-consecutive

	// gears are inaccessible.

	int m_forward_gears;



	// The number of consecutive reverse gears.  Any non-consecutive

	// gears are inaccessible.

	int m_reverse_gears;



	// The current gear.

	int m_gear;



	// The rotational speed at the clutch side of the transmission.

	double m_clutch_speed;



  public:

	//** Constructors



	// Let the program calulate equally-spaced

	Transmission (int forward_gears, double first_ratio, double last_ratio);



	Transmission ();



	// Shift to a particular gear.

	void shift (int gear);



	// Set the gear ratio for GEAR.  RATIO is (driveshaft speed) /

	// (engine speed).  Forward gears have positive ratios, usually >

	// 1.0.  Neutral has a rato of 0.0, unless you change it.

	void gear_ratio (int gear, double ratio);



    double gear_ratio (int gear) { return m_gear_ratios [gear]; }



	// Return the torque on the driveshaft due to friction at the

	// clutch.

	double torque (double drag);



	// Return the current gear.

	int gear () const { return m_gear; }



	// Return the number of consecutive forward gears.

	int forward_gears () const { return m_forward_gears; }



	// Return the number of consecutive reverse gears.

	int reverse_gears () const { return m_reverse_gears; }



	// Tell the transmission what the rotational speed of the

	// driveshaft is.

	void set_driveshaft_speed (double speed);



	// Return the rotational speed at the clutch side of the

	// transmission. 

	double clutch_speed () const { return m_clutch_speed; }

  };

}



#endif // not _TRANSMISSION_H_