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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
75 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
76 COMMENTS, REFERENCES, and NOTES [use "class documentation" below for API docs]
77 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
79 Note that the coefficients need not be calculated each delta-t. This is
80 something that may be fixed someday.
82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
84 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
86 /** This class models the aero coefficient and stability derivative coefficient
87 lookup table, value, vector, or equation (equation not modeled, yet).
88 Each coefficient for an axis is stored in that axes' vector of coefficients.
89 Each FDM execution frame the Run() method of the FGAerodynamics model
90 is called and the coefficient values are calculated.
93 @see <a href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jsbsim/JSBSim/FGCoefficient.h?rev=HEAD&content-type=text/vnd.viewcvs-markup">
95 @see <a href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jsbsim/JSBSim/FGCoefficient.cpp?rev=HEAD&content-type=text/vnd.viewcvs-markup">
99 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
101 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
103 class FGCoefficient : public FGJSBBase
107 @param exec a pointer to the FGFDMExec instance. */
108 FGCoefficient(FGFDMExec* exec);
110 virtual ~FGCoefficient();
112 /** Loads the stability derivative/aero coefficient data from the config file
113 as directed by the FGAerodynamics instance.
114 @param AC_cfg a pointer to the current config file instance. */
115 virtual bool Load(FGConfigFile* AC_cfg);
117 typedef vector <FGPropertyManager*> MultVec;
119 enum Type {UNKNOWN, VALUE, VECTOR, TABLE, EQUATION};
121 /** Returns the value for this coefficient.
122 Each instance of FGCoefficient stores a value for the "type" of coefficient
123 it is, one of: VALUE, VECTOR, TABLE, or EQUATION. This TotalValue function
124 is called when the value for a coefficient needs to be known. When it is called,
125 depending on what type of coefficient is represented by the FGCoefficient
126 instance, TotalValue() directs the appropriate Value() function to be called.
127 The type of coefficient represented is determined when the config file is read.
128 The coefficient definition includes the "type" specifier.
129 @return the current value of the coefficient represented by this instance of
131 virtual double TotalValue(void);
133 /** Returns the value for this coefficient.
134 TotalValue is stored each time TotalValue() is called. This function returns
135 the stored value but does not calculate it anew. This is valuable for merely
136 printing out the value.
137 @return the most recently calculated and stored value of the coefficient
138 represented by this instance of FGCoefficient. */
139 virtual inline double GetValue(void) const { return totalValue; }
141 /// Returns the name of this coefficient.
142 virtual inline string Getname(void) const {return name;}
144 /// Returns the value of the coefficient only - before it is re-dimensionalized.
145 virtual inline double GetSD(void) const { return SD;}
147 /** Outputs coefficient information.
148 Non-dimensionalizing parameter descriptions are output
149 for each aero coefficient defined.
150 @param multipliers the list of multipliers for this coefficient.*/
151 virtual void DisplayCoeffFactors(void);
153 /// Returns the name of the coefficient.
154 virtual inline string GetCoefficientName(void) { return name; }
155 /// Returns the stability derivative or coefficient value as a string.
156 virtual string GetSDstring(void);
159 inline void setBias(double b) { bias=b; }
160 inline void setGain(double g) { gain=g; };
161 inline double getBias(void) const { return bias; }
162 inline double getGain(void) const { return gain; }
164 virtual void bind(FGPropertyManager *parent);
165 virtual void unbind(void);
179 double Value(double, double);
180 double Value(double);
185 FGPropertyManager *LookupR, *LookupC;
187 FGPropertyManager *node; // must be private!!
192 double SD; // Actual stability derivative (or other coefficient) value
196 FGAtmosphere* Atmosphere;
198 FGAircraft* Aircraft;
199 FGTranslation* Translation;
200 FGRotation* Rotation;
201 FGPosition* Position;
202 FGAuxiliary* Auxiliary;
204 FGPropertyManager* PropertyManager;
206 virtual void Debug(int from);
209 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%