sah.cc

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/* $Header: /var/cvs/mbdyn/mbdyn/mbdyn-1.0/mbdyn/base/sah.cc,v 1.21 2017/01/12 14:46:10 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
 */

#include "mbconfig.h"           /* This goes first in every *.c,*.cc file */

#include "sah.h"

/* SampleAndHold - begin */

SampleAndHold::SampleAndHold(unsigned int uL,
                const DofOwner* pDO,
                const ScalarNode *pN,
                DriveCaller *pDC,
                const doublereal &dSP,
                flag fOut)
: ParameterNode(uL, pDO, 0., fOut),
pNode(pN),
Time(pDC),
dSamplePeriod(dSP)
{
        ASSERT(pN != 0);
        ASSERT(pDC != 0);
        ASSERT(dSP > 0.);

        dSampleTime = Time.dGet() + dSamplePeriod;
}

SampleAndHold::~SampleAndHold(void)
{
        NO_OP;
}

/* Contributo del nodo al file di restart */
std::ostream&
SampleAndHold::Restart(std::ostream& out) const
{
        return out << "# sample and hold parameter to be implemented" 
                << std::endl;
}

void
SampleAndHold::SetValue(DataManager *pDM,
                VectorHandler& /* X */, VectorHandler& /* XP */ ,
                SimulationEntity::Hints *ph)
{
        dSampleTime = Time.dGet() + dSamplePeriod;
        dX = pNode->dGetX();
}

/* Aggiorna i valori interni */   
void
SampleAndHold::Update(const VectorHandler& /* X */,
                const VectorHandler& /* XP */ )
{
        doublereal dT = Time.dGet();
        if (dT >= dSampleTime) {
                dX = pNode->dGetX();
                dSampleTime += dSamplePeriod;
        }
}

/* SampleAndHold - end */