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96 lines
2.1 KiB
96 lines
2.1 KiB
/***************************************************************************
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* Copyright (C) 2003-2004 by David Saxton *
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* david@bluehaze.org *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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***************************************************************************/
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#include "elementset.h"
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#include "matrix.h"
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#include "resistance.h"
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// #include <kdebug.h>
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Resistance::Resistance( const double resistance )
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: Element::Element()
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{
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m_g = resistance < 1e-9 ? 1e9 : 1./resistance;
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m_numCNodes = 2;
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// kdDebug() << k_funcinfo << endl;
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}
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Resistance::~Resistance()
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{
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// kdDebug() << k_funcinfo << endl;
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}
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void Resistance::setConductance( const double g )
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{
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if ( g == m_g )
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return;
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if (p_eSet)
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p_eSet->setCacheInvalidated();
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// Remove old resistance
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m_g = -m_g;
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add_initial_dc();
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m_g = g;
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add_initial_dc();
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}
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void Resistance::setResistance( const double r )
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{
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setConductance( r < 1e-9 ? 1e9 : 1./r );
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}
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void Resistance::add_map()
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{
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if (!b_status)
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return;
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if ( !p_cnode[0]->isGround )
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{
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p_A->setUse( p_cnode[0]->n(), p_cnode[0]->n(), Map::et_stable, false );
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}
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if ( !p_cnode[1]->isGround ) {
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p_A->setUse( p_cnode[1]->n(), p_cnode[1]->n(), Map::et_stable, false );
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}
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if ( !p_cnode[0]->isGround && !p_cnode[1]->isGround )
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{
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p_A->setUse( p_cnode[0]->n(), p_cnode[1]->n(), Map::et_stable, false );
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p_A->setUse( p_cnode[1]->n(), p_cnode[0]->n(), Map::et_stable, false );
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}
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}
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void Resistance::add_initial_dc()
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{
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if (!b_status) return;
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A_g( 0, 0 ) += m_g;
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A_g( 1, 1 ) += m_g;
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A_g( 0, 1 ) -= m_g;
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A_g( 1, 0 ) -= m_g;
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}
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void Resistance::updateCurrents()
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{
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if (!b_status) return;
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const double v=p_cnode[0]->v-p_cnode[1]->v;
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m_cnodeI[1] = v*m_g;
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m_cnodeI[0] = -m_cnodeI[1];
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}
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