Comparte two JSBSim properties in a script

[LucasJSch]

I want to do something like: position/h-sl-ft gt customized/custom-target in an XML script.

Is it possible?

[bcoconni]

Sorry for the late answer ! Yes this syntax is legal and is used in the example script scripts/J2461.xml:

jsbsim/scripts/J2461.xml

Line 97 in 2bdf0d4

<condition>forces/fbx-prop-lbs gt inertia/weight-lbs</condition>

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For the record, according to the code in FGCondition, the left item in the comparison must be a property while the right item can either be a property or a value:

jsbsim/src/math/FGCondition.h

Lines 80 to 81 in 2bdf0d4

	FGPropertyValue_ptr TestParam1;
	FGParameter_ptr TestParam2;

jsbsim/src/math/FGCondition.cpp

Lines 192 to 204 in 2bdf0d4

	double value1 = TestParam1->GetValue();
	double value2 = TestParam2->GetValue();
	switch (Comparison) {
	case eEQ:
	pass = value1 == value2;
	break;
	case eNE:
	pass = value1 != value2;
	break;
	case eGT:
	pass = value1 > value2;
	break;

and both FGPropertyValue and FGRealValue inherit from FGParameter:

jsbsim/src/math/FGPropertyValue.h

Line 62 in 2bdf0d4

class JSBSIM_API FGPropertyValue : public FGParameter

jsbsim/src/math/FGRealValue.h

Line 57 in 2bdf0d4

class JSBSIM_API FGRealValue : public FGParameter