ddrive.h

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/* $Header: /var/cvs/mbdyn/mbdyn/mbdyn-1.0/mbdyn/base/ddrive.h,v 1.15 2017/01/12 14:46:09 masarati Exp $ */
/* 
 * MBDyn (C) is a multibody analysis code. 
 * http://www.mbdyn.org
 *
 * Copyright (C) 1996-2017
 *
 * Pierangelo Masarati  <masarati@aero.polimi.it>
 * Paolo Mantegazza     <mantegazza@aero.polimi.it>
 *
 * Dipartimento di Ingegneria Aerospaziale - Politecnico di Milano
 * via La Masa, 34 - 20156 Milano, Italy
 * http://www.aero.polimi.it
 *
 * Changing this copyright notice is forbidden.
 *
 * 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 (version 2 of the License).
 * 
 *
 * 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
 */

/* Classe di drivers che usano gradi di liberta' nodali
 * 
 * Il valore del drive viene fatto dipendere da un grado di liberta' nodale
 * in modo del tutto generale e trasparente. Ovvero in ingresso dati si
 * associa il drive al grado di liberta' j-esimo del nodo i-esimo, con 
 * verifiche di consistenza. In esecuzione, la funzione propria dGet() del 
 * drive restituisce il valore del grado di liberta' associato 
 * (o della derivata, se il grado di liberta' e' differenziale).
 */

#ifndef DDRIVE_H
#define DDRIVE_H

#include "drive.h"
#include "node.h"

class DriveDriveCaller : public DriveCaller
{
private:
        DriveOwner DO1;
        DriveOwner DO2;

public:
        DriveDriveCaller(const DriveHandler* pDH,
                        const DriveCaller* pDC1,
                        const DriveCaller* pDC2);
        virtual ~DriveDriveCaller(void);

        /* Copia */
        virtual DriveCaller* pCopy(void) const;
   
        virtual std::ostream& Restart(std::ostream& out) const;
   
        inline doublereal dGet(const doublereal& dVar) const;
        inline doublereal dGet(void) const;

        /* this is about drives that are differentiable */
        virtual inline bool bIsDifferentiable(void) const;
        virtual inline doublereal dGetP(const doublereal& dVar) const;
        virtual inline doublereal dGetP(void) const;
};

inline doublereal
DriveDriveCaller::dGet(const doublereal& dVar) const
{
        return DO1.pGetDriveCaller()->dGet(DO2.pGetDriveCaller()->dGet(dVar));
}

inline doublereal
DriveDriveCaller::dGet(void) const
{
        return DO1.pGetDriveCaller()->dGet(DO2.pGetDriveCaller()->dGet());
}

/* this is about drives that are differentiable */
inline bool
DriveDriveCaller::bIsDifferentiable(void) const
{
        return DO1.bIsDifferentiable() && DO2.bIsDifferentiable();
}

inline doublereal
DriveDriveCaller::dGetP(const doublereal& dVar) const
{
        return DO1.dGetP(DO2.dGet(dVar)) * DO2.dGetP(dVar);
}

inline doublereal
DriveDriveCaller::dGetP(void) const
{
        return DO1.dGetP(DO2.dGet()) * DO2.dGetP();
}

#endif /* DDRIVE_H */