Nested parameters with ofxGui and ofParameters

beginners
#1

Hello, I’m using ofxGui and ofParameter in order to save the seetings of the GUI in differents XML files. Everything works fine, I can save and load parameters .
the xml file look like this:

<settings>
<rule>F -> |[-F][+F]</rule>
<axiom>F</axiom>
<maxDepth>5</maxDepth>
</settings>

Now i would like is to read(not to modify, in this case) a field as a nested field, that can contains multiple items, like the field rules in this example:

<settings>
<rules>
  <rule>B -> F[-B]+B</rule>
  <rule>F -> FF</rule>
</rules>
<axiom>F</axiom>
<maxDepth>5</maxDepth>
</settings>

I first tried something obvious like ofParameter<vector<string>> rules, but ofParameter does not support vectors. Is there a workaround for this case?

#2

ofParmaterGroup should do, you can anidate an ofParameterGroup into another and ofParameter into an ofParameterGroup and will give you the xml you are trying to create.

ofParameter of a vector should work but won’t be serializable since vector doesn’t implement the stream operator

#3

Thank you. It works only if I specify the structure and the values of the parameters in the setup.

    //ofApp.h
    ofParameterGroup selectedRules;
    ofParameter<string> singleRule;
    //ofApp.cpp
    singleRule.set("rule", "FF");
    selectedRules.add(singleRule);
    selectedRules.setName("rules");

But I can not specify the number of the parameter contained in the group in the setup call, because sometimes the node contains 3 nested node, sometimes only one.
I think i go for a simple string and a character that acts as delimiters between the different values.

#4

Hi Arturo,

Sorry to bring back this old thread. Is there a way now to serialise ofParameter<vector>?
I tried to implement stream operators to vector but since ofParameter class is not aware of those implementations seems not to work.

Is there anything I could do, that is not manually checking if a parameter is a vector, and serializing / deserializing it manually? That’s what I’m already doing in: https://github.com/PlaymodesStudio/ofxOceanode/blob/0f012d71b8fbd7507c82ad7b7ce56d7e82d70f70/src/Nodes/ofxOceanodeNode.cpp#L361-L389

Thanks!