fgtable.cpp

6 DOF Missle Simulation

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

unsigned int FGTable::FindNumColumns(string test_line)
{
  // determine number of data columns in table (first column is row lookup - don't count)
  size_t position=0;
  unsigned int nCols=0;
  while ((position = test_line.find_first_not_of(" \t", position)) != string::npos) {
    nCols++;
    position = test_line.find_first_of(" \t", position);
  }
  return nCols;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTable::GetValue(void) const
{
  double temp = 0;
  double temp2 = 0;

  switch (Type) {
  case tt1D:
    temp = lookupProperty[eRow]->getDoubleValue();
    temp2 = GetValue(temp);
    return temp2;
  case tt2D:
    return GetValue(lookupProperty[eRow]->getDoubleValue(),
                    lookupProperty[eColumn]->getDoubleValue());
  case tt3D:
    return GetValue(lookupProperty[eRow]->getDoubleValue(),
                    lookupProperty[eColumn]->getDoubleValue(),
                    lookupProperty[eTable]->getDoubleValue());
  default:
    cerr << "Attempted to GetValue() for invalid/unknown table type" << endl;
    throw(string("Attempted to GetValue() for invalid/unknown table type"));
  }
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTable::GetValue(double key) const
{
  double Factor, Value, Span;
  unsigned int r = lastRowIndex;

  //if the key is off the end of the table, just return the
  //end-of-table value, do not extrapolate
  if( key <= Data[1][0] ) {
    lastRowIndex=2;
    //cout << "Key underneath table: " << key << endl;
    return Data[1][1];
  } else if ( key >= Data[nRows][0] ) {
    lastRowIndex=nRows;
    //cout << "Key over table: " << key << endl;
    return Data[nRows][1];
  }

  // the key is somewhere in the middle, search for the right breakpoint
  // The search is particularly efficient if 
  // the correct breakpoint has not changed since last frame or
  // has only changed very little

  while (r > 2     && Data[r-1][0] > key) { r--; }
  while (r < nRows && Data[r][0]   < key) { r++; }

  lastRowIndex=r;
  // make sure denominator below does not go to zero.

  Span = Data[r][0] - Data[r-1][0];
  if (Span != 0.0) {
    Factor = (key - Data[r-1][0]) / Span;
    if (Factor > 1.0) Factor = 1.0;
  } else {
    Factor = 1.0;
  }

  Value = Factor*(Data[r][1] - Data[r-1][1]) + Data[r-1][1];

  return Value;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTable::GetValue(double rowKey, double colKey) const
{
  double rFactor, cFactor, col1temp, col2temp, Value;
  unsigned int r = lastRowIndex;
  unsigned int c = lastColumnIndex;

  while(r > 2     && Data[r-1][0] > rowKey) { r--; }
  while(r < nRows && Data[r]  [0] < rowKey) { r++; }

  while(c > 2     && Data[0][c-1] > colKey) { c--; }
  while(c < nCols && Data[0][c]   < colKey) { c++; }

  lastRowIndex=r;
  lastColumnIndex=c;

  rFactor = (rowKey - Data[r-1][0]) / (Data[r][0] - Data[r-1][0]);
  cFactor = (colKey - Data[0][c-1]) / (Data[0][c] - Data[0][c-1]);

  if (rFactor > 1.0) rFactor = 1.0;
  else if (rFactor < 0.0) rFactor = 0.0;

  if (cFactor > 1.0) cFactor = 1.0;
  else if (cFactor < 0.0) cFactor = 0.0;

  col1temp = rFactor*(Data[r][c-1] - Data[r-1][c-1]) + Data[r-1][c-1];
  col2temp = rFactor*(Data[r][c] - Data[r-1][c]) + Data[r-1][c];

  Value = col1temp + cFactor*(col2temp - col1temp);

  return Value;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTable::GetValue(double rowKey, double colKey, double tableKey) const
{
  double Factor, Value, Span;
  unsigned int r = lastRowIndex;

  //if the key is off the end  (or before the beginning) of the table,
  // just return the boundary-table value, do not extrapolate

  if( tableKey <= Data[1][1] ) {
    lastRowIndex=2;
    return Tables[0]->GetValue(rowKey, colKey);
  } else if ( tableKey >= Data[nRows][1] ) {
    lastRowIndex=nRows;
    return Tables[nRows-1]->GetValue(rowKey, colKey);
  }

  // the key is somewhere in the middle, search for the right breakpoint
  // The search is particularly efficient if 
  // the correct breakpoint has not changed since last frame or
  // has only changed very little

  while(r > 2     && Data[r-1][1] > tableKey) { r--; }
  while(r < nRows && Data[r]  [1] < tableKey) { r++; }

  lastRowIndex=r;
  // make sure denominator below does not go to zero.

  Span = Data[r][1] - Data[r-1][1];
  if (Span != 0.0) {
    Factor = (tableKey - Data[r-1][1]) / Span;
    if (Factor > 1.0) Factor = 1.0;
  } else {
    Factor = 1.0;
  }

  Value = Factor*(Tables[r-1]->GetValue(rowKey, colKey) - Tables[r-2]->GetValue(rowKey, colKey))
                              + Tables[r-2]->GetValue(rowKey, colKey);

  return Value;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void FGTable::operator<<(stringstream& in_stream)
{
  int startRow=0;
  int startCol=0;

// In 1D table, no pseudo-row of column-headers (i.e. keys):
  if (Type == tt1D) startRow = 1;

  for (unsigned int r=startRow; r<=nRows; r++) {
    for (unsigned int c=startCol; c<=nCols; c++) {
      if (r != 0 || c != 0) {
        in_stream >> Data[r][c];
      }
    }
  }
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

FGTable& FGTable::operator<<(const double n)
{
  Data[rowCounter][colCounter] = n;
  if (colCounter == nCols) {
    colCounter = 0;
    rowCounter++;
  } else {
    colCounter++;
  }
  return *this;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

FGTable& FGTable::operator<<(const int n)
{
  *this << (double)n;
  return *this;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void FGTable::Print(void)
{
  int startRow=0;
  int startCol=0;

  if (Type == tt1D || Type == tt3D) startRow = 1;
  if (Type == tt3D) startCol = 1;

#if defined (sgi) && !defined(__GNUC__) && (_COMPILER_VERSION < 740)
  unsigned long flags = cout.setf(ios::fixed);
#else
  ios::fmtflags flags = cout.setf(ios::fixed); // set up output stream
#endif

  switch(Type) {
    case tt1D:
      cout << "    1 dimensional table with " << nRows << " rows." << endl;
      break;
    case tt2D:
      cout << "    2 dimensional table with " << nRows << " rows, " << nCols << " columns." << endl;
      break;
    case tt3D:
      cout << "    3 dimensional table with " << nRows << " rows, "
                                          << nCols << " columns "
                                          << nTables << " tables." << endl;
      break;
  }
  cout.precision(4);
  for (unsigned int r=startRow; r<=nRows; r++) {
    cout << "	";
    for (unsigned int c=startCol; c<=nCols; c++) {
      if (r == 0 && c == 0) {
        cout << "	";
      } else {
        cout << Data[r][c] << "	";
        if (Type == tt3D) {
          cout << endl;
          Tables[r-1]->Print();
        }
      }
    }
    cout << endl;
  }
  cout.setf(flags); // reset
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void FGTable::bind(void)
{
  typedef double (FGTable::*PMF)(void) const;
  if ( !Name.empty() && !internal) {
    string tmp = PropertyManager->mkPropertyName(Name, false); // Allow upper
    PropertyManager->Tie( tmp, this, (PMF)&FGTable::GetValue);
  }
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//    The bitmasked value choices are as follows:
//    unset: In this case (the default) JSBSim would only print
//       out the normally expected messages, essentially echoing
//       the config files as they are read. If the environment
//       variable is not set, debug_lvl is set to 1 internally
//    0: This requests JSBSim not to output any messages
//       whatsoever.
//    1: This value explicity requests the normal JSBSim
//       startup messages
//    2: This value asks for a message to be printed out when
//       a class is instantiated
//    4: When this value is set, a message is displayed when a
//       FGModel object executes its Run() method
//    8: When this value is set, various runtime state variables
//       are printed out periodically
//    16: When set various parameters are sanity checked and
//       a message is printed out when they go out of bounds

void FGTable::Debug(int from)
{
  if (debug_lvl <= 0) return;

  if (debug_lvl & 1) { // Standard console startup message output
    if (from == 0) { // Constructor

    }
  }
  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
    if (from == 0) cout << "Instantiated: FGTable" << endl;
    if (from == 1) cout << "Destroyed:    FGTable" << endl;
  }
  if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
  }
  if (debug_lvl & 8 ) { // Runtime state variables
  }
  if (debug_lvl & 16) { // Sanity checking
  }
  if (debug_lvl & 64) {
    if (from == 0) { // Constructor
      cout << IdSrc << endl;
      cout << IdHdr << endl;
    }
  }
}
}