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capacitance.h

/***************************************************************************
 *   Copyright (C) 2003-2004 by David Saxton                               *
 *   david@bluehaze.org                                                    *
 *                                                                         *
 *   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.                                   *
 ***************************************************************************/

#ifndef CAPACITANCE_H
#define CAPACITANCE_H

#include "reactive.h"

/**
@author David Saxton
@short Capacitance
*/
00020 class Capacitance : public Reactive
{
public:
      enum Method
      {
            m_none, // None
            m_euler, // Backward Euler
            m_trap // Trapezoidal (currently unimplemented)
      };
      Capacitance( const double capacitance, const double delta );
      virtual ~Capacitance();
      
00032       virtual Type type() const { return Element_Capacitance; }
      /**
       * Set the stepping use for numerical integration of capacitance,
       * and the interval between successive updates
       */
      void setMethod( Method m );
      virtual void time_step();
      virtual void add_initial_dc();
      void setCapacitance( const double c );

protected:
      virtual void updateCurrents();
      virtual bool updateStatus();
      
private:
      double m_cap; // Capacitance
      Method m_method; // Method of integration
      
      double m_scaled_cap; // capacitance scaled to time base of latest m_delta
      double i_eq_old;
};

#endif

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