/***************************************************************************
 *   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 "ccvs.h"

CCVS::CCVS( const double gain )
	: Element::Element()
{
	m_g = gain;
	m_numCBranches = 2;
	m_numCNodes = 4;
}

CCVS::~CCVS()
{
}

void CCVS::setGain( const double g )
{
	if ( m_g == g )
		return;
	
	if (p_eSet)
		p_eSet->setCacheInvalidated();
	
	m_g = g;
	add_initial_dc();
}


void CCVS::add_map()
{
	if (!b_status) return;
	
	if ( !p_cnode[0]->isGround )
	{
		p_A->setUse_b( p_cnode[0]->n(), p_cbranch[0]->n(), Map::et_constant, true );
		p_A->setUse_c( p_cbranch[0]->n(), p_cnode[0]->n(), Map::et_constant, true );
	}
	if ( !p_cnode[1]->isGround )
	{
		p_A->setUse_b( p_cnode[1]->n(), p_cbranch[0]->n(), Map::et_constant, true );
		p_A->setUse_c( p_cbranch[0]->n(), p_cnode[1]->n(), Map::et_constant, true );
	}
	if ( !p_cnode[2]->isGround )
	{
		p_A->setUse_b( p_cnode[2]->n(), p_cbranch[1]->n(), Map::et_constant, true );
		p_A->setUse_c( p_cbranch[1]->n(), p_cnode[2]->n(), Map::et_constant, true );
	}
	if ( !p_cnode[3]->isGround )
	{
		p_A->setUse_b( p_cnode[3]->n(), p_cbranch[1]->n(), Map::et_constant, true );
		p_A->setUse_c( p_cbranch[1]->n(), p_cnode[3]->n(), Map::et_constant, true );
	}
	p_A->setUse_d( p_cbranch[1]->n(), p_cbranch[0]->n(), Map::et_stable, true );
}


void CCVS::add_initial_dc()
{
	if (!b_status) return;
	
	A_b( 0, 0 ) = 1;
	A_c( 0, 0 ) = 1;
	A_b( 1, 0 ) = -1;
	A_c( 0, 1 ) = -1;
	A_b( 2, 1 ) = 1;
	A_c( 1, 2 ) = 1;
	A_b( 3, 1 ) = -1;
	A_c( 1, 3 ) = -1;
	A_d( 1, 0 ) = -m_g;
}

void CCVS::updateCurrents()
{
	if (!b_status) return;
	m_cnodeI[1] = p_cbranch[0]->i;
	m_cnodeI[0] = -m_cnodeI[1];
	m_cnodeI[3] = p_cbranch[0]->i;
	m_cnodeI[2] = -m_cnodeI[3];
}

