include/vamos/body/Brake.h

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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
//  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 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;

  public:
        //** 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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