FGDistributor Class Reference

Detailed Description

Encapsulates a distributor for the flight control system.

The distributor component models a distributor -

Within a test, additional tests can be specified, which allows for complex groupings of logical comparisons. Each test contains additional conditions, as well as possibly additional tests.

<distributor name="name/is/irrelevant" type="exclusive|inclusive">
 
  <case>
    [<test logic="{AND|OR}" value="{property|value}">
      {property} {conditional} {property|value}
      <test logic="{AND|OR}">
        {property} {conditional} {property|value}
        ...
      </test>
      ...
    </test>] <!-- Optional <test> one time. A <case> without a <test> is always executed -->
    <property value="number|property"> property_name </property>
    ...
  </case>
 
  ... <!-- Additional cases -->
 
</distributor>

If the distributor type is exclusive no further <case> components are evaluated once a case <test> condition has been found to be true.

If the distributor type is inclusive all the <case> components are evaluated no matter how many <case> conditions are true.

Whether the distributor type is inclusive or exclusive the <case> component without <test> is always executed.

Here's an example that evaluate the sign of the property test/number and sets test/default to the value of test/reference.

<distributor>
  <case>
    <test>
      test/number lt 0.0
    </test>
    <property value="-1.0"> test/sign </property>
  </case>
  <case>
    <test>
      test/number ge 0.0
    </test>
    <property value="1.0"> test/sign </property>
  </case>
  <!-- default case -->
  <case>
    <property value="test/reference"> test/default </property>
  </case>
</distributor>

Note: In the "logic" attribute, "AND" is the default logic, if none is supplied.

Author

Jon S. Berndt

Definition at line 125 of file FGDistributor.h.

#include <FGDistributor.h>

Inheritance diagram for FGDistributor:

Collaboration diagram for FGDistributor:

Public Member Functions
	FGDistributor (FGFCS *fcs, Element *element)
	Constructor. More...
	~FGDistributor ()
	Destructor.
bool	Run (void) override
	Executes the distributor logic. More...
Public Member Functions inherited from FGFCSComponent
	FGFCSComponent (FGFCS *fcs, Element *el)
	Constructor.
virtual	~FGFCSComponent ()
	Destructor.
std::string	GetName (void) const
double	GetOutput (void) const
virtual double	GetOutputPct (void) const
std::string	GetType (void) const
virtual void	ResetPastStates (void)
virtual void	SetOutput (void)
Public Member Functions inherited from FGJSBBase
	FGJSBBase ()
	Constructor for FGJSBBase.
virtual	~FGJSBBase ()
	Destructor for FGJSBBase.
void	disableHighLighting (void)
	Disables highlighting in the console output.

Additional Inherited Members
Public Types inherited from FGJSBBase
enum	{ eL = 1 , eM , eN }
	Moments L, M, N.
enum	{ eP = 1 , eQ , eR }
	Rates P, Q, R.
enum	{ eU = 1 , eV , eW }
	Velocities U, V, W.
enum	{ eX = 1 , eY , eZ }
	Positions X, Y, Z.
enum	{ ePhi = 1 , eTht , ePsi }
	Euler angles Phi, Theta, Psi.
enum	{ eDrag = 1 , eSide , eLift }
	Stability axis forces, Drag, Side force, Lift.
enum	{ eRoll = 1 , ePitch , eYaw }
	Local frame orientation Roll, Pitch, Yaw.
enum	{ eNorth = 1 , eEast , eDown }
	Local frame position North, East, Down.
enum	{ eLat = 1 , eLong , eRad }
	Locations Radius, Latitude, Longitude.
enum	{   inNone = 0 , inDegrees , inRadians , inMeters ,   inFeet }
	Conversion specifiers.
Static Public Member Functions inherited from FGJSBBase
static const std::string &	GetVersion (void)
	Returns the version number of JSBSim. More...
static constexpr double	KelvinToFahrenheit (double kelvin)
	Converts from degrees Kelvin to degrees Fahrenheit. More...
static constexpr double	CelsiusToRankine (double celsius)
	Converts from degrees Celsius to degrees Rankine. More...
static constexpr double	RankineToCelsius (double rankine)
	Converts from degrees Rankine to degrees Celsius. More...
static constexpr double	KelvinToRankine (double kelvin)
	Converts from degrees Kelvin to degrees Rankine. More...
static constexpr double	RankineToKelvin (double rankine)
	Converts from degrees Rankine to degrees Kelvin. More...
static constexpr double	FahrenheitToCelsius (double fahrenheit)
	Converts from degrees Fahrenheit to degrees Celsius. More...
static constexpr double	CelsiusToFahrenheit (double celsius)
	Converts from degrees Celsius to degrees Fahrenheit. More...
static constexpr double	CelsiusToKelvin (double celsius)
	Converts from degrees Celsius to degrees Kelvin. More...
static constexpr double	KelvinToCelsius (double kelvin)
	Converts from degrees Kelvin to degrees Celsius. More...
static constexpr double	FeetToMeters (double measure)
	Converts from feet to meters. More...
static bool	EqualToRoundoff (double a, double b)
	Finite precision comparison. More...
static bool	EqualToRoundoff (float a, float b)
	Finite precision comparison. More...
static bool	EqualToRoundoff (float a, double b)
	Finite precision comparison. More...
static bool	EqualToRoundoff (double a, float b)
	Finite precision comparison. More...
static constexpr double	Constrain (double min, double value, double max)
	Constrain a value between a minimum and a maximum value.
static constexpr double	sign (double num)
Static Public Attributes inherited from FGJSBBase
static char	highint [5] = {27, '[', '1', 'm', '\0' }
	highlights text
static char	halfint [5] = {27, '[', '2', 'm', '\0' }
	low intensity text
static char	normint [6] = {27, '[', '2', '2', 'm', '\0' }
	normal intensity text
static char	reset [5] = {27, '[', '0', 'm', '\0' }
	resets text properties
static char	underon [5] = {27, '[', '4', 'm', '\0' }
	underlines text
static char	underoff [6] = {27, '[', '2', '4', 'm', '\0' }
	underline off
static char	fgblue [6] = {27, '[', '3', '4', 'm', '\0' }
	blue text
static char	fgcyan [6] = {27, '[', '3', '6', 'm', '\0' }
	cyan text
static char	fgred [6] = {27, '[', '3', '1', 'm', '\0' }
	red text
static char	fggreen [6] = {27, '[', '3', '2', 'm', '\0' }
	green text
static char	fgdef [6] = {27, '[', '3', '9', 'm', '\0' }
	default text
static short	debug_lvl = 1
Protected Member Functions inherited from FGFCSComponent
virtual void	bind (Element *el, FGPropertyManager *pm)
void	CheckInputNodes (size_t MinNodes, size_t MaxNodes, Element *el)
void	Clip (void)
void	Delay (void)
Static Protected Member Functions inherited from FGJSBBase
static std::string	CreateIndexedPropertyName (const std::string &Property, int index)
Protected Attributes inherited from FGFCSComponent
bool	clip
FGParameter_ptr	ClipMax
FGParameter_ptr	ClipMin
bool	cyclic_clip
unsigned int	delay
double	delay_time
double	dt
FGFCS *	fcs
int	index
std::vector< FGPropertyValue_ptr >	InitNodes
double	Input
std::vector< FGPropertyValue_ptr >	InputNodes
std::string	Name
double	Output
std::vector< double >	output_array
std::vector< FGPropertyNode_ptr >	OutputNodes
std::string	Type
Static Protected Attributes inherited from FGJSBBase
static constexpr double	radtodeg = 180. / M_PI
static constexpr double	degtorad = M_PI / 180.
static constexpr double	hptoftlbssec = 550.0
static constexpr double	psftoinhg = 0.014138
static constexpr double	psftopa = 47.88
static constexpr double	fttom = 0.3048
static constexpr double	ktstofps = 1852./(3600*fttom)
static constexpr double	fpstokts = 1.0 / ktstofps
static constexpr double	inchtoft = 1.0/12.0
static constexpr double	m3toft3 = 1.0/(fttom*fttom*fttom)
static constexpr double	in3tom3 = inchtoft*inchtoft*inchtoft/m3toft3
static constexpr double	inhgtopa = 3386.38
static constexpr double	slugtolb = 32.174049
	Note that definition of lbtoslug by the inverse of slugtolb and not to a different constant you can also get from some tables will make lbtoslug*slugtolb == 1 up to the magnitude of roundoff. More...
static constexpr double	lbtoslug = 1.0/slugtolb
static constexpr double	kgtolb = 2.20462
static constexpr double	kgtoslug = 0.06852168
static const std::string	needed_cfg_version = "2.0"
static const std::string	JSBSim_version = JSBSIM_VERSION " " __DATE__ " " __TIME__

Constructor & Destructor Documentation

FGDistributor()

FGDistributor	(	FGFCS *	fcs,
		Element *	element
	)

Constructor.

Parameters

fcs	a pointer to the parent FGFCS class
element	a pointer to the Element (from the config file XML tree) that represents this distributor component

Definition at line 53 of file FGDistributor.cpp.

  : FGFCSComponent(fcs, element)
{
  auto PropertyManager = fcs->GetPropertyManager();
 
  bind(element, PropertyManager.get()); // Bind() this component here in case it is used in its own
                                        // definition for a sample-and-hold
 
  string type_string = element->GetAttributeValue("type");
  if (type_string == "inclusive") Type = eInclusive;
  else if (type_string == "exclusive") Type = eExclusive;
  else {
    throw("Not a known Distributor type, "+type_string);
  }
 
  Element* case_element = element->FindElement("case");
  while (case_element) {
    Case* current_case = new Case;
    Element* test_element = case_element->FindElement("test");
    if (test_element) current_case->SetTest(new FGCondition(test_element, PropertyManager));
    Element* prop_val_element = case_element->FindElement("property");
    while (prop_val_element) {
      string value_string = prop_val_element->GetAttributeValue("value");
      string property_string = prop_val_element->GetDataLine();
      current_case->AddPropValPair(new PropValPair(property_string, value_string,
                                                   PropertyManager, prop_val_element));
      prop_val_element = case_element->FindNextElement("property");
    }
    Cases.push_back(current_case);
    case_element = element->FindNextElement("case");
  }
 
  Debug(0);
}

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Member Function Documentation

Run()

bool Run ( void  )

overridevirtual

Executes the distributor logic.

Returns

true - always

Reimplemented from FGFCSComponent.

Definition at line 98 of file FGDistributor.cpp.

{
  bool completed = false;
  for (auto Case: Cases) { // Loop through all Cases
    if (Case->HasTest()) {
      if (Case->GetTestResult() && !((Type == eExclusive) && completed)) {
        Case->SetPropValPairs();
        completed = true;
      }
    } else { // If no test present, execute always
      Case->SetPropValPairs();
    }
  }
 
  return true;
}

---

The documentation for this class was generated from the following files:

• FGDistributor.h
• FGDistributor.cpp