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/***************************************************************************
* 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. *
***************************************************************************/
#include "elementset.h"
#include "matrix.h"
#include "resistance.h"
// #include <kdebug.h>
Resistance::Resistance( const double resistance )
: Element::Element()
{
m_g = resistance < 1e-9 ? 1e9 : 1./resistance;
m_numCNodes = 2;
// kdDebug() << k_funcinfo << endl;
}
Resistance::~Resistance()
{
// kdDebug() << k_funcinfo << endl;
}
void Resistance::setConductance( const double g )
{
if ( g == m_g )
return;
if (p_eSet)
p_eSet->setCacheInvalidated();
// Remove old resistance
m_g = -m_g;
add_initial_dc();
m_g = g;
add_initial_dc();
}
void Resistance::setResistance( const double r )
{
setConductance( r < 1e-9 ? 1e9 : 1./r );
}
void Resistance::add_map()
{
if (!b_status)
return;
if ( !p_cnode[0]->isGround )
{
p_A->setUse( p_cnode[0]->n(), p_cnode[0]->n(), Map::et_stable, false );
}
if ( !p_cnode[1]->isGround ) {
p_A->setUse( p_cnode[1]->n(), p_cnode[1]->n(), Map::et_stable, false );
}
if ( !p_cnode[0]->isGround && !p_cnode[1]->isGround )
{
p_A->setUse( p_cnode[0]->n(), p_cnode[1]->n(), Map::et_stable, false );
p_A->setUse( p_cnode[1]->n(), p_cnode[0]->n(), Map::et_stable, false );
}
}
void Resistance::add_initial_dc()
{
if (!b_status) return;
A_g( 0, 0 ) += m_g;
A_g( 1, 1 ) += m_g;
A_g( 0, 1 ) -= m_g;
A_g( 1, 0 ) -= m_g;
}
void Resistance::updateCurrents()
{
if (!b_status) return;
const double v=p_cnode[0]->v-p_cnode[1]->v;
m_cnodeI[1] = v*m_g;
m_cnodeI[0] = -m_cnodeI[1];
}
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