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/***************************************************************************
* Copyright (C) 2005 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 "pin.h"
#include "wire.h"
#include <assert.h>
Wire::Wire( Pin * startPin, Pin * endPin )
{
assert(startPin);
assert(endPin);
m_pStartPin = startPin;
m_pEndPin = endPin;
m_current = 0.;
m_bCurrentIsKnown = false;
m_pStartPin->addOutputWire(this);
m_pEndPin->addInputWire(this);
}
Wire::~Wire()
{
}
bool Wire::calculateCurrent()
{
if ( m_pStartPin->currentIsKnown() && m_pStartPin->numWires() < 2 )
{
m_current = m_pStartPin->current();
m_bCurrentIsKnown = true;
return true;
}
if ( m_pEndPin->currentIsKnown() && m_pEndPin->numWires() < 2 )
{
m_current = -m_pEndPin->current();
m_bCurrentIsKnown = true;
return true;
}
if ( m_pStartPin->currentIsKnown() )
{
double i = m_pStartPin->current();
bool ok = true;
const WireList outlist = m_pStartPin->outputWireList();
WireList::const_iterator end = outlist.end();
for ( WireList::const_iterator it = outlist.begin(); it != end && ok; ++it )
{
if ( *it && (Wire*)*it != this )
{
if ( (*it)->currentIsKnown() )
i -= (*it)->current();
else
ok = false;
}
}
const WireList inlist = m_pStartPin->inputWireList();
end = inlist.end();
for ( WireList::const_iterator it = inlist.begin(); it != end && ok; ++it )
{
if ( *it && (Wire*)*it != this )
{
if ( (*it)->currentIsKnown() )
i += (*it)->current();
else
ok = false;
}
}
if (ok)
{
m_current = i;
m_bCurrentIsKnown = true;
return true;
}
}
if ( m_pEndPin->currentIsKnown() )
{
double i = -m_pEndPin->current();
bool ok = true;
const WireList outlist = m_pEndPin->outputWireList();
WireList::const_iterator end = outlist.end();
for ( WireList::const_iterator it = outlist.begin(); it != end && ok; ++it )
{
if ( *it && (Wire*)*it != this )
{
if ( (*it)->currentIsKnown() )
i += (*it)->current();
else
ok = false;
}
}
const WireList inlist = m_pEndPin->inputWireList();
end = inlist.end();
for ( WireList::const_iterator it = inlist.begin(); it != end && ok; ++it )
{
if ( *it && (Wire*)*it != this )
{
if ( (*it)->currentIsKnown() )
i -= (*it)->current();
else
ok = false;
}
}
if (ok)
{
m_current = i;
m_bCurrentIsKnown = true;
return true;
}
}
m_bCurrentIsKnown = false;
return false;
}
double Wire::voltage() const
{
return ( m_pStartPin->voltage() + m_pEndPin->voltage() )/2;
}
void Wire::setCurrentKnown( bool known )
{
m_bCurrentIsKnown = known;
if (!known)
m_current = 0.;
}
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