1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 Header: FGCoefficient.h
7 ------------- Copyright (C) 1999 Jon S. Berndt (jsb@hal-pc.org) -------------
9 This program is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free Software
11 Foundation; either version 2 of the License, or (at your option) any later
14 This program is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
19 You should have received a copy of the GNU General Public License along with
20 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21 Place - Suite 330, Boston, MA 02111-1307, USA.
23 Further information about the GNU General Public License can also be found on
24 the world wide web at http://www.gnu.org.
27 --------------------------------------------------------------------------------
30 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
32 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
34 #ifndef FGCOEFFICIENT_H
35 #define FGCOEFFICIENT_H
37 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
39 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
42 # include <simgear/compiler.h>
47 #include "FGConfigFile.h"
49 #include "FGJSBBase.h"
50 #include "FGPropertyManager.h"
52 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
54 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
56 #define ID_COEFFICIENT "$Id$"
60 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
62 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
77 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
78 COMMENTS, REFERENCES, and NOTES [use "class documentation" below for API docs]
79 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
81 Note that the coefficients need not be calculated each delta-t. This is
82 something that may be fixed someday.
84 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
86 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
88 /** This class models the aero coefficient and stability derivative coefficient
89 lookup table, value, vector, or equation (equation not modeled, yet).
90 Each coefficient for an axis is stored in that axes' vector of coefficients.
91 Each FDM execution frame the Run() method of the FGAerodynamics model
92 is called and the coefficient values are calculated.
95 @see <a href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jsbsim/JSBSim/FGCoefficient.h?rev=HEAD&content-type=text/vnd.viewcvs-markup">
97 @see <a href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jsbsim/JSBSim/FGCoefficient.cpp?rev=HEAD&content-type=text/vnd.viewcvs-markup">
101 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
103 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
105 class FGCoefficient : public FGJSBBase
109 @param exec a pointer to the FGFDMExec instance. */
110 FGCoefficient(FGFDMExec* exec);
112 virtual ~FGCoefficient();
114 /** Loads the stability derivative/aero coefficient data from the config file
115 as directed by the FGAerodynamics instance.
116 @param AC_cfg a pointer to the current config file instance. */
117 virtual bool Load(FGConfigFile* AC_cfg);
119 typedef vector <FGPropertyManager*> MultVec;
121 enum Type {UNKNOWN, VALUE, VECTOR, TABLE, EQUATION};
123 /** Returns the value for this coefficient.
124 Each instance of FGCoefficient stores a value for the "type" of coefficient
125 it is, one of: VALUE, VECTOR, TABLE, or EQUATION. This TotalValue function
126 is called when the value for a coefficient needs to be known. When it is called,
127 depending on what type of coefficient is represented by the FGCoefficient
128 instance, TotalValue() directs the appropriate Value() function to be called.
129 The type of coefficient represented is determined when the config file is read.
130 The coefficient definition includes the "type" specifier.
131 @return the current value of the coefficient represented by this instance of
133 virtual double TotalValue(void);
135 /** Returns the value for this coefficient.
136 TotalValue is stored each time TotalValue() is called. This function returns
137 the stored value but does not calculate it anew. This is valuable for merely
138 printing out the value.
139 @return the most recently calculated and stored value of the coefficient
140 represented by this instance of FGCoefficient. */
141 virtual inline double GetValue(void) const { return totalValue; }
143 /// Returns the name of this coefficient.
144 virtual inline string Getname(void) const {return name;}
146 /// Returns the value of the coefficient only - before it is re-dimensionalized.
147 virtual inline double GetSD(void) const { return SD;}
149 /** Outputs coefficient information.
150 Non-dimensionalizing parameter descriptions are output
151 for each aero coefficient defined.
152 @param multipliers the list of multipliers for this coefficient.*/
153 virtual void DisplayCoeffFactors(void);
155 /// Returns the name of the coefficient.
156 virtual inline string GetCoefficientName(void) { return name; }
157 /// Returns the stability derivative or coefficient value as a string.
158 virtual string GetSDstring(void);
161 inline void setBias(double b) { bias=b; }
162 inline void setGain(double g) { gain=g; };
163 inline double getBias(void) const { return bias; }
164 inline double getGain(void) const { return gain; }
166 virtual void bind(FGPropertyManager *parent);
167 virtual void unbind(void);
181 double Value(double, double);
182 double Value(double);
187 FGPropertyManager *LookupR, *LookupC;
189 FGPropertyManager *node; // must be private!!
194 double SD; // Actual stability derivative (or other coefficient) value
198 FGAtmosphere* Atmosphere;
200 FGAircraft* Aircraft;
201 FGTranslation* Translation;
202 FGRotation* Rotation;
203 FGPosition* Position;
204 FGAuxiliary* Auxiliary;
206 FGPropertyManager* PropertyManager;
208 FGPropertyManager* resolveSymbol(string name);
210 virtual void Debug(int from);
213 } // using namespace JSBSim
215 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%