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Implementing VNAV support in FlightGear: Difference between revisions
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Implementing VNAV support in FlightGear (view source)
Revision as of 01:09, 4 December 2013
, 4 December 2013→FGWaypoint
| Line 297: | Line 297: | ||
void Debug(int from); | void Debug(int from); | ||
}; | }; | ||
</syntaxhighlight> | |||
== Adding new Functions == | |||
Here's a stub that demonstrates how to add a new mathematical function named '''myFunction''': | |||
<syntaxhighlight lang="diff"> | |||
diff --git a/src/math/FGFunction.cpp b/src/math/FGFunction.cpp | |||
index 6beeedb..03c38e0 100644 | |||
--- a/src/math/FGFunction.cpp | |||
+++ b/src/math/FGFunction.cpp | |||
@@ -107,6 +107,8 @@ const std::string FGFunction::not_string = "not"; | |||
const std::string FGFunction::ifthen_string = "ifthen"; | |||
const std::string FGFunction::switch_string = "switch"; | |||
const std::string FGFunction::interpolate1d_string = "interpolate1d"; | |||
+const std::string FGFunction::myfunction_string = "myfunction"; | |||
+ | |||
FGFunction::FGFunction(FGPropertyManager* propMan, Element* el, const string& prefix) | |||
: PropertyManager(propMan), Prefix(prefix) | |||
@@ -228,6 +230,8 @@ FGFunction::FGFunction(FGPropertyManager* propMan, Element* el, const string& pr | |||
Type = eSwitch; | |||
} else if (operation == interpolate1d_string) { | |||
Type = eInterpolate1D; | |||
+ } else if (operation == myfunction_string) { | |||
+ Type = eMyFunction; | |||
} else if (operation != description_string) { | |||
cerr << "Bad operation " << operation << " detected in configuration file" << endl; | |||
} | |||
@@ -765,6 +769,9 @@ double FGFunction::GetValue(void) const | |||
else // | |||
{temp = 1;} | |||
break; | |||
+ case eMyFunction: | |||
+ cerr << "FIXME: Implement myFunction!" << endl; | |||
+ break; | |||
default: | |||
cerr << "Unknown function operation type" << endl; | |||
break; | |||
diff --git a/src/math/FGFunction.h b/src/math/FGFunction.h | |||
index 49d3e15..e5ba140 100644 | |||
--- a/src/math/FGFunction.h | |||
+++ b/src/math/FGFunction.h | |||
@@ -799,6 +799,7 @@ private: | |||
static const std::string ifthen_string; | |||
static const std::string switch_string; | |||
static const std::string interpolate1d_string; | |||
+ static const std::string myfunction_string; | |||
double cachedValue; | |||
enum functionType {eTopLevel=0, eProduct, eDifference, eSum, eQuotient, ePow, eSqrt, eToRadians, | |||
eToDegrees, eExp, eAbs, eSign, eSin, eCos, eTan, eASin, eACos, eATan, eATan2, | |||
@@ -806,7 +807,7 @@ private: | |||
eLog2, eLn, eLog10, eLT, eLE, eGE, eGT, eEQ, eNE, eAND, eOR, eNOT, | |||
eIfThen, eSwitch, eInterpolate1D, eRotation_alpha_local, | |||
eRotation_beta_local, eRotation_gamma_local, eRotation_bf_to_wf, | |||
- eRotation_wf_to_bf} Type; | |||
+ eRotation_wf_to_bf, eMyFunction } Type; | |||
std::string Name; | |||
std::string sCopyTo; // Property name to copy function value to | |||
FGPropertyNode_ptr pCopyTo; // Property node for CopyTo property string | |||
</syntaxhighlight> | </syntaxhighlight> | ||