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 *   Copyright (C) 2003-2005 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.                                   *

#ifndef CIRCUIT_H
#define CIRCUIT_H

#include <qguardedptr.h>
#include "qstringlist.h"
#include "qvaluelist.h"

#include "elementset.h"

class CircuitDocument;
class Wire;
class Pin;
class Element;
class LogicOut;

typedef QValueList<QGuardedPtr<Pin> > PinList;
typedef QValueList<Element*> ElementList;

class LogicCacheNode

      LogicCacheNode * high;
      LogicCacheNode * low;
      QuickVector * data;

Usage of this class (usually invoked from CircuitDocument):
(1) Add Wires, Pins and Elements to the class as appropriate
(2) Call init to initialize the simulation
(3) Control the simulation with step()

This class can be considered a bridge between the gui-tainted CircuitDocument - specific
to this implementation, and the pure untainted ElementSet. Please keep it that way.

@short Simulates a collection of components
@author David Saxton
00054 class Circuit

      void addPin( Pin *node );
      void addElement( Element *element );

      bool contains( Pin *node );
      bool containsNonLinear() const { return m_elementSet->containsNonLinear(); }

      void init();
            * Called after everything else has been setup - before doNonLogic or
            * doLogic are called for the first time. Preps the circuit.
      void initCache();
            * Marks all cached results as invalidated and removes them.
      void setCacheInvalidated();
            * Solves for non-logic elements
      void doNonLogic();
            * Solves for logic elements (i.e just does fbSub)
00083       void doLogic() { m_elementSet->doLinear(false); }

      void displayEquations();
      void updateCurrents();

      void createMatrixMap();
            * This will identify the ground node and non-ground nodes in the given set.
            * Ground will be given the eqId -1, non-ground of 0.
            * @param highest The highest ground type of the groundnodes found. If no
            ground nodes were found, this will be (gt_never-1).
            * @returns the number of ground nodes. If all nodes are at or below the
            *                 gt_never threshold, then this will be zero.
      static int identifyGround( PinList nodeList, int *highest = 0l );

      void setNextChanged( Circuit * circuit, unsigned char chain ) { m_pNextChanged[chain] = circuit; }
      Circuit * nextChanged( unsigned char chain ) const { return m_pNextChanged[chain]; }
      void setCanAddChanged( bool canAdd ) { m_bCanAddChanged = canAdd; }
      bool canAddChanged() const { return m_bCanAddChanged; }

      void cacheAndUpdate();
            * Update the nodal voltages from those calculated in ElementSet
      void updateNodalVoltages();
            * Step the reactive elements.
      void stepReactive();
            * Returns true if any of the nodes are ground
      static bool recursivePinAdd( Pin *node, PinList *unassignedNodes, PinList *associated, PinList *nodes );

      int m_cnodeCount;
      int m_branchCount;
      int m_prepNLCount; // Count until next m_elementSet->prepareNonLinear() is called

      PinList m_pinList;
      ElementList m_elementList;
      ElementSet *m_elementSet;

      //Stuff for caching
      bool m_bCanCache;
      LogicCacheNode * m_pLogicCacheBase;
      unsigned m_logicOutCount;
      LogicOut ** m_pLogicOut;

      bool m_bCanAddChanged;
      Circuit * m_pNextChanged[2];


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