Author: Jon S. Berndt
Date started: 07/01/01
- ------------- Copyright (C) 2001 Jon S. Berndt (jsb@hal-pc.org) -------------
+ ------------- Copyright (C) 2001 Jon S. Berndt (jon@jsbsim.org) -------------
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
#include <string>
#include <cmath>
-using std::fabs;
-using std::string;
+using std::min;
+using std::max;
+
+#include "input_output/string_utilities.h"
#ifndef M_PI
# define M_PI 3.14159265358979323846
#endif
-
-#if !defined(WIN32) || defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 1300))
- using std::max;
-#endif
+#define IDENT(a,b) static const char* const (a)[] = {b,(a)[0]}
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
DEFINITIONS
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
-#define ID_JSBBASE "$Id$"
+#define ID_JSBBASE "$Id: FGJSBBase.h,v 1.39 2014/01/13 10:45:59 ehofman Exp $"
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
FORWARD DECLARATIONS
* This class provides universal constants, utility functions, messaging
* functions, and enumerated constants to JSBSim.
@author Jon S. Berndt
- @version $Id$
+ @version $Id: FGJSBBase.h,v 1.39 2014/01/13 10:45:59 ehofman Exp $
*/
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
FGJSBBase() {};
/// Destructor for FGJSBBase.
- ~FGJSBBase() {};
+ virtual ~FGJSBBase() {};
/// JSBSim Message structure
class Message {
public:
unsigned int fdmId;
unsigned int messageId;
- string text;
- string subsystem;
+ std::string text;
+ std::string subsystem;
enum mType {eText, eInteger, eDouble, eBool} type;
bool bVal;
int iVal;
double dVal;
};
+ /// First order, (low pass / lag) filter
+ class Filter {
+ double prev_in;
+ double prev_out;
+ double ca;
+ double cb;
+ public: Filter(void) {}
+ public: Filter(double coeff, double dt) {
+ prev_in = prev_out = 0.0;
+ double denom = 2.0 + coeff*dt;
+ ca = coeff*dt/denom;
+ cb = (2.0 - coeff*dt)/denom;
+ }
+ public: double execute(double in) {
+ double out = (in + prev_in)*ca + prev_out*cb;
+ prev_in = in;
+ prev_out = out;
+ return out;
+ }
+ };
+
///@name JSBSim console output highlighting terms.
//@{
/// highlights text
/** Places a Message structure on the Message queue.
@param msg pointer to a Message structure
@return pointer to a Message structure */
-void PutMessage(const Message& msg);
+ void PutMessage(const Message& msg);
/** Creates a message with the given text and places it on the queue.
@param text message text
@return pointer to a Message structure */
- void PutMessage(const string& text);
+ void PutMessage(const std::string& text);
/** Creates a message with the given text and boolean value and places it on the queue.
@param text message text
@param bVal boolean value associated with the message
@return pointer to a Message structure */
-void PutMessage(const string& text, bool bVal);
+ void PutMessage(const std::string& text, bool bVal);
/** Creates a message with the given text and integer value and places it on the queue.
@param text message text
@param iVal integer value associated with the message
@return pointer to a Message structure */
-void PutMessage(const string& text, int iVal);
+ void PutMessage(const std::string& text, int iVal);
/** Creates a message with the given text and double value and places it on the queue.
@param text message text
@param dVal double value associated with the message
@return pointer to a Message structure */
-void PutMessage(const string& text, double dVal);
+ void PutMessage(const std::string& text, double dVal);
/** Reads the message on the queue (but does not delete it).
@return 1 if some messages */
int SomeMessages(void);
/** Reads the message on the queue and removes it from the queue.
- @return pointer to a Message structure (or NULL if no mesage) */
- Message* ProcessMessage(void);
+ This function also prints out the message.*/
+ void ProcessMessage(void);
+ /** Reads the next message on the queue and removes it from the queue.
+ This function also prints out the message.
+ @return a pointer to the message, or NULL if there are no messages.*/
+ Message* ProcessNextMessage(void);
//@}
/** Returns the version number of JSBSim.
* @return The version number of JSBSim. */
- string GetVersion(void) {return JSBSim_version;}
+ std::string GetVersion(void) {return JSBSim_version;}
/// Disables highlighting in the console output.
void disableHighLighting(void);
return kelvin - 273.15;
}
+ /** Converts from feet to meters
+ * @param measure The length in feet.
+ * @return The length in meters. */
+ static double FeetToMeters (double measure) {
+ return measure*0.3048;
+ }
+
+ /** Calculate the calibrated airspeed from the Mach number. It uses the
+ * Rayleigh formula for supersonic speeds (See "Introduction to Aerodynamics
+ * of a Compressible Fluid - H.W. Liepmann, A.E. Puckett - Wiley & sons
+ * (1947)" ยง5.4 pp 75-80)
+ * @param mach The Mach number
+ * @param p Pressure in psf
+ * @param psl Pressure at sea level in psf
+ * @param rhosl Density at sea level in slugs/ft^3
+ * @return The calibrated airspeed (CAS) in ft/s
+ * */
+ static double VcalibratedFromMach(double mach, double p, double psl, double rhosl);
+
+ /** Calculate the Mach number from the calibrated airspeed. For subsonic
+ * speeds, the reversed formula has a closed form. For supersonic speeds, the
+ * Rayleigh formula is reversed by the Newton-Raphson algorithm.
+ * @param vcas The calibrated airspeed (CAS) in ft/s
+ * @param p Pressure in psf
+ * @param psl Pressure at sea level in psf
+ * @param rhosl Density at sea level in slugs/ft^3
+ * @return The Mach number
+ * */
+ static double MachFromVcalibrated(double vcas, double p, double psl, double rhosl);
+
/** Finite precision comparison.
@param a first value to compare
@param b second value to compare
@return if the two values can be considered equal up to roundoff */
static bool EqualToRoundoff(double a, double b) {
double eps = 2.0*DBL_EPSILON;
- return fabs(a - b) <= eps*max(fabs(a), fabs(b));
+ return std::fabs(a - b) <= eps * max(std::fabs(a), std::fabs(b));
}
/** Finite precision comparison.
@return if the two values can be considered equal up to roundoff */
static bool EqualToRoundoff(float a, float b) {
float eps = 2.0*FLT_EPSILON;
- return fabs(a - b) <= eps*max(fabs(a), fabs(b));
+ return std::fabs(a - b) <= eps * max(std::fabs(a), std::fabs(b));
}
/** Finite precision comparison.
static double Constrain(double min, double value, double max) {
return value<min?(min):(value>max?(max):(value));
}
+
+ static double sign(double num) {return num>=0.0?1.0:-1.0;}
protected:
static Message localMsg;
static std::queue <Message> Messages;
- void Debug(int from) {};
+ void Debug(int) {};
static unsigned int messageId;
static const double inhgtopa;
static const double fttom;
static double Reng; // Specific Gas Constant,ft^2/(sec^2*R)
+ static double Rstar;
+ static double Mair;
static const double SHRatio;
static const double lbtoslug;
static const double slugtolb;
static const double kgtolb;
static const double kgtoslug;
- static const string needed_cfg_version;
- static const string JSBSim_version;
+ static const std::string needed_cfg_version;
+ static const std::string JSBSim_version;
+
+ static std::string CreateIndexedPropertyName(const std::string& Property, int index);
+
+ static double GaussianRandomNumber(void);
public:
/// Moments L, M, N
projects / flightgear.git / blobdiff