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//  Brake.h - a brake for a wheel.
//  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 _BRAKE_H_
#define _BRAKE_H_

namespace Vamos_Body
  //* A brake for a wheel.
  class Brake
      // The sliding coefficient of friction for the brake pads on the
      // rotor.
      double m_friction; 

      // The effective radius of the rotor.
      double m_radius;

      // The area of the brake pads.
      double m_area;

      // The maximum allowed pressure.
      double m_max_pressure;

      // The fraction of the pressure to be applied to the brake.
      double m_bias;

      // The brake locks when the linear brake velocity divided by pl
      double m_threshold;

      // true if the brake is locked, false otherwise.
      bool m_is_locked;
      // coefficient to multiply the brakes by for handbrakes
      double m_handbrake;

      //** Constructor
      Brake (double slide, double radius, double area, double max_pressure, 
               double bias, double handbrake);

      // Return the torque exerted on the wheel by the brake.
      double torque (double factor, double rotational_velocity);
      double handbrake() {return m_handbrake;}

      // Rerturn true if the brake is locked, false otherwise.
      bool is_locked () const { return m_is_locked; }

#endif // !_BRAKE_H_

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