info gmsh

C.4 Adding a new option

To add a new option in Gmsh:

create the option in the CTX class (‘Common/Context.h’) if it's a classical option, or in the PViewOptions class (‘Post/PViewOptions.h’) if it's a post-processing view-dependent option;
in ‘Common/DefaultOptions.h’, give a name (for the parser to be able to access it), a reference to a handling routine (i.e. opt_XXX) and a default value for this option;
create the handling routine opt_XXX in ‘Common/Options.cpp’ (and add the prototype in ‘Common/Options.h’);
optional: create the associated widget in ‘Fltk/optionWindow.cpp’;