| modeling a typed graph with gmf [message #65949] |
Thu, 19 October 2006 18:12  |
Eclipse User |
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Hi,
I am trying to create a graphical editor for a graph that contains nodes
and edges between nodes. Edges shall have a user-chosen type.
I uploaded an image of the graph ecore model to my website. When you
look at the model it should be clear what I want to do.
the url is: http://xgag.sourceforge.net/img/Board.jpeg
Modeling such a graph with a gmf created editor should work as follows:
The user creates several nodes, which are basically labeled rectangles.
Drawing a simple polyline connection between two nodes should create an
edge in the domain model. The polyline connection has a nested label,
whose value should be the type of the connection.
I really have troubles creating a suitable mapping model: I create a
link mapping that maps the connection to an Edge element, which works
fine. Furthermore the connections label should map to Direction element.
Trying to create a nested label-mapping does not seem powerful enough,
since i can only map the label´s value to Attributes of Edge.
I am aware of that adding multiple edges with the same type will involve
to check whether a matching Direction already exists. If this is so,
only the reference has to be set to this Direction. If not I have to
create a new Direction AND set the reference. Further when deleting a
Connection I should check whether there are still connections that share
the same type, etc. After a few desperate hours of try´n error I would
however just be happy if the Direction element would be created at least.
Does anyone understand what I want to do, and could give a hint on how
to achieve it?
Thanks for any help.
Felix
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| Re: modeling a typed graph with gmf [message #66291 is a reply to message #65949] |
Fri, 20 October 2006 07:38  |
| Eclipse User |
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> Trying to create a nested label-mapping does not seem powerful enough,
> since i can only map the label?s value to Attributes of Edge.
You can add derived transient attribute to Edge and provide implementation
that delegates to Direction.
Artem
"Felix Dorner" <felix_do@web.de> wrote in message
news:eh8tan$tfo$1@utils.eclipse.org...
> Hi,
>
>
> I am trying to create a graphical editor for a graph that contains nodes
> and edges between nodes. Edges shall have a user-chosen type.
>
> I uploaded an image of the graph ecore model to my website. When you look
> at the model it should be clear what I want to do.
>
> the url is: http://xgag.sourceforge.net/img/Board.jpeg
>
>
> Modeling such a graph with a gmf created editor should work as follows:
>
> The user creates several nodes, which are basically labeled rectangles.
> Drawing a simple polyline connection between two nodes should create an
> edge in the domain model. The polyline connection has a nested label,
> whose value should be the type of the connection.
>
>
> I really have troubles creating a suitable mapping model: I create a link
> mapping that maps the connection to an Edge element, which works fine.
> Furthermore the connections label should map to Direction element. Trying
> to create a nested label-mapping does not seem powerful enough, since i
> can only map the label?s value to Attributes of Edge.
>
> I am aware of that adding multiple edges with the same type will involve
> to check whether a matching Direction already exists. If this is so, only
> the reference has to be set to this Direction. If not I have to create a
> new Direction AND set the reference. Further when deleting a Connection I
> should check whether there are still connections that share the same type,
> etc. After a few desperate hours of try?n error I would however just be
> happy if the Direction element would be created at least.
>
> Does anyone understand what I want to do, and could give a hint on how to
> achieve it?
>
>
> Thanks for any help.
> Felix
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