Christian Buchner wrote on 2012-09-13:
>> How would I use the object's own geometry of the object as the
clickable
> hot spot?
>
> I've been trying to implement a geode called DraggableCylinder which
> inherits from the dragger. And I want this geode to also implement the
> constrain() and receive() functions from osgManipulator::Constraint
> and osgManipulator::DraggerCallback.
>
> My class declaration (inheritance) now looks like this
>
> class DraggableCylinder : public My2DDragger, private
> osgManipulator::DraggerCallback, private osgManipulator::Constraint {
};
>
> Now I ran into the problem that the DraggableCylinder inherits three
> ref() functions from several osg::Object base classes. Is there any
> way to resolve this ambiguity easily? ;-) Like providing one
> definitive overload of ref()/unref() that calls into the ref()/unref()
> functions of the inherited osg::Objects... I realize that this is more
> of a C++ question, but maybe someone has solved this issue previously?
This is known as the diamond problem, and can be solved by virtual
inheritance (http://en.wikipedia.org/wiki/Virtual_inheritance):
class DraggableCylinder: public virtual My2DDragger, private virtual
osgManipulator::DraggerCallback, private virtual
osgManipulator::Constraint {};
Hope this helps!
--
Bryan Thrall
Principal Software Engineer
FlightSafety International
[email protected]
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