Re: combined UML diagrams

On 28 Oct 2003, saintiss gmx net wrote:

On Tuesday 28 October 2003 11:20, SainTiss wrote:
Hmm, I think I found out why associations aren't handled... As far as I
can see, there's no way of telling what classes are at the end-points of
the association, just by looking at dia's save format... There's only
graphical, positional information...

Yet, in the diagram itself, it's possible to "attach" the association to
a class by making sure it matches with one of the 8 handles of that
class...  So I guess it must be possible to find out which classes are
connected by an association...

I got this idea that I might be able to find the classes by getting the
connectionpoint of the associationend-handle, and then looking in the
"connected" GList...  However, it seems that, in that list, only the
association object itself is present (there's only 1 element in the

Here's what I tried:

orth = &(assoc->orth);
handle = (orth->handles)[0];
conpoint = handle->connected_to;
connObjs = conpoint->connected;
obj = (Object*) g_list_nth_data(connObjs, 0);

Printing out the address of obj and the address of assoc, showed that
both objects are the same...  Playing around with the indices, I learned
that there are 3 handles in the association (seems logical), and 1 object
in the connObjs list...

Take a look at select_transitively() in app/select.c, it does the same kind
of thing, both ways.

You're quite right that you're getting the same thing.  The connection
point is what's visualized by a little blue x, the handle is the box.  A
handle can only be connected to one thing, a connection point can have a
number of handles connected to it.  So when you go from handle to object,
you need to look at handle->connected_to->object.

Am I doing this the wrong way, or is this a bug?

Also, I noticed that, when loading a *.dia file where an association was
connected to UMLClasses, after loading the connection is lost (i.e. when
connected, the end points of the association are red, yet after loading,

That sounds really strange, I'm sure people would have noticed by now --
and indeed, it doesn't do that for me.  Can you send me a diagram that
behaves this way?


Lars Clausen (| HÃrdgrim of Numenor
"I do not agree with a word that you say, but I   |----------------------------
will defend to the death your right to say it."   | Where are we going, and
    --Evelyn Beatrice Hall paraphrasing Voltaire  | what's with the handbasket?

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