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//  Clutch.h - a clutch for the drivetrain.
//  Copyright (C) 2001 Sam Varner
//  This file is part of Vamos Automotive Simulator.
//  This program 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 2 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
//  GNU General Public License for more details.
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef _CLUTCH_H_
#define _CLUTCH_H_

namespace Vamos_Body
  //* A clutch for the drivetrain.
  class Clutch
      // The coefficient of friction for the clutch plates.
      double m_sliding_friction;

      // The effective radius of the clutch plates.
      double m_radius;

      // The contact area.
      double m_area;
      // The current pressure on the plates.
      double m_pressure;

      // The maximum allowed pressure on the plates.
      double m_max_pressure;

      // The locking threshold.  The clutch pretends to be fully engaged
      // when engine speed - transmission speeds < m_threshold * normal
      // force. 
      double m_threshold;

      // true if the clutch is fully engaged, false otherwise.
      bool m_engaged;

      //** Constructor
      Clutch (double sliding, double radius, double area, double max_pressure);

      // Return the drag caused by friction between the clutch plates.
      double drag (double engine_speed, double drive_speed);

      // Set the pressure on the plates to FACTOR * m_max_pressure.  If
      // FACTOR >= 1.0, the clutch is fully engaged.
      void position (double factor);

      // Return the current pressure.
      double pressure () const { return m_pressure; }

      // Return the maximum presure.
      double max_pressure () const { return m_max_pressure; }

      // Return true if the clutch is fully engaged, false otherwise.
      bool engaged () const { return m_engaged; }

#endif // !_CLUTCH_H_

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