FitNode.cpp

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// Include files
// -------------
// local
#include "Event/FitNode.h"

//=============================================================================
// Standard constructor, initializes variables
//=============================================================================
FitNode::FitNode():
  m_predictedState(0),
  m_filteredState(0)
{
  // FitNode default constructer
  m_transportMatrix = HepMatrix(5, 5, 1);
  m_transportVector = HepVector(5, 0);
  m_noiseMatrix     = HepSymMatrix(5, 0);
}

//=============================================================================
// Constructor from a Measurement
//=============================================================================
FitNode::FitNode(Measurement& aMeas):
  m_predictedState(0),
  m_filteredState(0)
{
  //FitNode constructer
  m_transportMatrix = HepMatrix(5, 5, 1);
  m_transportVector = HepVector(5, 0);
  m_noiseMatrix     = HepSymMatrix(5, 0);
  m_measurement     = &aMeas;
}

//=============================================================================
// Destructor
//=============================================================================
FitNode::~FitNode()
{
  if (m_predictedState) delete m_predictedState;
  if (m_filteredState) delete m_filteredState;
}

//=============================================================================
// Update the State predicted by the Kalman filter
//=============================================================================
void FitNode::setPredictedState( const State& predictedState )
{  
  //if pointer not set clone state - else copy (not great)
  if (m_predictedState) delete m_predictedState;
  m_predictedState = predictedState.clone();
  setState(predictedState);
}

//=============================================================================
// Update the filtered state from the Kalman filter step
//=============================================================================
void FitNode::setFilteredState( const State& filteredState )
{  
  //if pointer not set clone state - else copy (not great)
  if ( m_filteredState ) delete m_filteredState;
  m_filteredState = filteredState.clone();
  setState(filteredState);
}

//=============================================================================
// Add the transport transformation of prevNode to this node
//=============================================================================
void FitNode::addNode( const FitNode& prevNode )
{
  // add the transport transformation of prevNode to this node
  m_transportVector += m_transportMatrix * prevNode.transportVector() ;
  m_noiseMatrix += (prevNode.noiseMatrix()).similarity( m_transportMatrix );
  m_transportMatrix = m_transportMatrix * prevNode.transportMatrix();  
}

//=============================================================================

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