src/FDM/JSBSim/FGTable.cpp

   1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   2
   3  Module:       FGTable.cpp
   4  Author:       Jon S. Berndt
   5  Date started: 1/9/2001
   6  Purpose:      Models a lookup table
   7
   8  ------------- Copyright (C) 2001  Jon S. Berndt (jsb@hal-pc.org) -------------
   9
  10  This program is free software; you can redistribute it and/or modify it under
  11  the terms of the GNU General Public License as published by the Free Software
  12  Foundation; either version 2 of the License, or (at your option) any later
  13  version.
  14
  15  This program is distributed in the hope that it will be useful, but WITHOUT
  16  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  18  details.
  19
  20  You should have received a copy of the GNU General Public License along with
  21  this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  22  Place - Suite 330, Boston, MA  02111-1307, USA.
  23
  24  Further information about the GNU General Public License can also be found on
  25  the world wide web at http://www.gnu.org.
  26
  27 FUNCTIONAL DESCRIPTION
  28 --------------------------------------------------------------------------------
  29 Models a lookup table
  30
  31 HISTORY
  32 --------------------------------------------------------------------------------
  33 JSB  1/9/00          Created
  34
  35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  36 INCLUDES
  37 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
  38
  39 #include "FGTable.h"
  40
  41 #if defined ( sgi ) && !defined( __GNUC__ )
  42 #include <iomanip.h>
  43 #else
  44 #include <iomanip>
  45 #endif
  46
  47 static const char *IdSrc = "$Id$";
  48 static const char *IdHdr = ID_TABLE;
  49
  50 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  51 CLASS IMPLEMENTATION
  52 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
  53
  54 using namespace std;
  55
  56 FGTable::FGTable(int NRows, int NCols) : nRows(NRows), nCols(NCols)
  57 {
  58   Type = tt2D;
  59   colCounter = 1;
  60   rowCounter = 0;
  61
  62   Data = Allocate();
  63
  64   if (debug_lvl & 2) cout << "Instantiated: FGTable" << endl;
  65 }
  66
  67 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  68
  69 FGTable::FGTable(int NRows) : nRows(NRows), nCols(1)
  70 {
  71   Type = tt1D;
  72   colCounter = 0;
  73   rowCounter = 1;
  74
  75   Data = Allocate();
  76   if (debug_lvl & 2) cout << "Instantiated: FGTable" << endl;
  77 }
  78
  79 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  80
  81 float** FGTable::Allocate(void)
  82 {
  83   Data = new float*[nRows+1];
  84   for (int r=0; r<=nRows; r++) {
  85     Data[r] = new float[nCols+1];
  86     for (int c=0; c<=nCols; c++) {
  87       Data[r][c] = 0.0;
  88     }
  89   }
  90   return Data;
  91 }
  92
  93 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  94
  95 FGTable::~FGTable()
  96 {
  97   for (int r=0; r<=nRows; r++) if (Data[r]) delete[] Data[r];
  98   if (Data) delete[] Data;
  99   if (debug_lvl & 2) cout << "Destroyed:    FGTable" << endl;
 100 }
 101
 102 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 103
 104 float FGTable::GetValue(float key)
 105 {
 106   float Factor, Value, Span;
 107   int r;
 108
 109   for (r=1; r<=nRows; r++) if (Data[r][0] >= key) break;
 110   r = r < 2 ? 2 : (r > nRows ? nRows : r);
 111
 112   // make sure denominator below does not go to zero.
 113
 114   Span = Data[r][0] - Data[r-1][0];
 115   if (Span != 0.0) {
 116     Factor = (key - Data[r-1][0]) / Span;
 117     if (Factor > 1.0) Factor = 1.0;
 118   } else {
 119     Factor = 1.0;
 120   }
 121
 122   Value = Factor*(Data[r][1] - Data[r-1][1]) + Data[r-1][1];
 123
 124   return Value;
 125 }
 126
 127 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 128
 129 float FGTable::GetValue(float rowKey, float colKey)
 130 {
 131   float rFactor, cFactor, col1temp, col2temp, Value;
 132   int r, c;
 133
 134   for (r=1;r<=nRows;r++) if (Data[r][0] >= rowKey) break;
 135   for (c=1;c<=nCols;c++) if (Data[0][c] >= colKey) break;
 136
 137   c = c < 2 ? 2 : (c > nCols ? nCols : c);
 138   r = r < 2 ? 2 : (r > nRows ? nRows : r);
 139
 140   rFactor = (rowKey - Data[r-1][0]) / (Data[r][0] - Data[r-1][0]);
 141   cFactor = (colKey - Data[0][c-1]) / (Data[0][c] - Data[0][c-1]);
 142
 143   if (rFactor > 1.0) rFactor = 1.0;
 144   else if (rFactor < 0.0) rFactor = 0.0;
 145
 146   if (cFactor > 1.0) cFactor = 1.0;
 147   else if (cFactor < 0.0) cFactor = 0.0;
 148
 149   col1temp = rFactor*(Data[r][c-1] - Data[r-1][c-1]) + Data[r-1][c-1];
 150   col2temp = rFactor*(Data[r][c] - Data[r-1][c]) + Data[r-1][c];
 151
 152   Value = col1temp + cFactor*(col2temp - col1temp);
 153
 154   return Value;
 155 }
 156
 157 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 158
 159 void FGTable::operator<<(FGConfigFile& infile)
 160 {
 161   int startRow;
 162
 163   if (Type == tt1D) startRow = 1;
 164   else startRow = 0;
 165
 166   for (int r=startRow; r<=nRows; r++) {
 167     for (int c=0; c<=nCols; c++) {
 168       if (r != 0 || c != 0) {
 169         infile >> Data[r][c];
 170       }
 171     }
 172   }
 173 }
 174
 175 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 176
 177 FGTable& FGTable::operator<<(const double n)
 178 {
 179   Data[rowCounter][colCounter] = n;
 180   if (colCounter == nCols) {
 181     colCounter = 0;
 182     rowCounter++;
 183   } else {
 184     colCounter++;
 185   }
 186   return *this;
 187 }
 188
 189 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 190
 191 FGTable& FGTable::operator<<(const int n)
 192 {
 193   *this << (double)n;
 194   return *this;
 195 }
 196
 197 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 198
 199 FGTable& FGTable::operator<<(const float n)
 200 {
 201   *this << (double)n;
 202   return *this;
 203 }
 204
 205 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 206
 207 void FGTable::Print(void)
 208 {
 209   int startRow;
 210
 211   if (Type == tt1D) startRow = 1;
 212   else startRow = 0;
 213
 214   cout.setf(ios::fixed); // set up output stream
 215   cout.precision(4);
 216
 217   for (int r=startRow; r<=nRows; r++) {
 218     cout << "   ";
 219     for (int c=0; c<=nCols; c++) {
 220       if (r == 0 && c == 0) {
 221       cout << " ";
 222       } else {
 223       cout << Data[r][c] << "   ";
 224       }
 225     }
 226     cout << endl;
 227   }
 228   cout.setf(0, ios::floatfield); // reset
 229 }
 230
 231 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 232
 233 void FGTable::Debug(void)
 234 {
 235     //TODO: Add your source code here
 236 }
 237
 238