[gme-users] Changing the color of diagram objects?

[Attila Vizhanyo]

This thread actually rises a more interesting general question, ie how 
to specify the visualization aspect of visual modeling languages?
I think GME falls short in providing a model-based solution to this 
problem; it relies on object attributes for some limited visualization 
features (bitmaps and colour/ style of lines), and COM decorator 
components, which is bulky for model engineers.

I think if GME could provide a modeling langague for specifying language 
visualization (~concrete syntax), then along with MetaGME for syntax and 
GReAT for semantics, it could provide a complete model-based solution 
for model-based language design. Such a visualization language must be 
general, maybe generic, (in the sense that GReAT can be parameterized 
with metamodels), expressive, easy-to-use, etc...

Thanks,
Attila

Paulo Asterio de Castro Guerra wrote:

> I diagree with that. OCL should not have side effects, by definition.
>
> 2006/2/10, Jesper Berthing <jbe at cfsi.dk <mailto:jbe at cfsi.dk>>:
>
>     Thanks, Attila and Zoltan
>
>     It would have been interesting if the OCL language had some
>     features to set attribute values, that could be placed before the
>     true or false statement of the OCL construct.
>
>     Regards,
>     Jesper
>
>     ________________________________
>
>     Fra: gme-users-bounces at list.isis.vanderbilt.edu
>     <mailto:gme-users-bounces at list.isis.vanderbilt.edu> på vegne af
>     Attila Vizhanyo
>     Sendt: to 2/9/2006 5:38
>     Til: A list for GME users to share thoughts and discuss bugs and
>     fixes.
>     Emne: Re: [gme-users] Changing the color of diagram objects?
>
>
>
>     You might want to download the GReAT source files from
>     repo.isis.vanderbilt.edu <http://repo.isis.vanderbilt.edu>, and
>     take a look at the UMLDecorator project
>     for an example. UMLDecorator works the way Zoli described earlier.
>
>     HTH,
>     Attila
>
>     Jesper Berthing wrote:
>
>     > Hi,
>     >
>     > I have raised the question in one of my previous responses to the
>     > list, but I have not received any reply. Therefore I will try again,
>     > because it seems to be a simple question.
>     >
>     >
>     >
>     > Is it possible to change the color of an object in the diagram,
>     > depending on an attribute value of that object.
>     >
>     > Like:
>     >
>     > Model.Enable can be set to true or false, is it possible to do:
>     >
>     >
>     > "if self.Enable then let self.color = 0x0000FF else self.color =
>     > 0x000000 endif" as a
>     >
>     > 1. Constraint attached to the object? or
>     >
>     > 2. Can I use a "if then else" in the general preference field of
>     the
>     > object? or
>     >
>     > 3. Use the Java BON interface to do so?
>     >
>     > If it is possible how could it be done?
>     >
>     >
>     > I know the above will not work I have tried it ;-)
>     >
>     > Regards,
>     > Jesper
>     >
>     >
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