Re: Python-Scripting in Dia

[Hans Breuer <hans breuer org>]

At 02.08.2010 23:13, Florian Sittel wrote:
> Hi Guys,
>
> I am building an application for storing data as semantic network.
> I would like to use Dia as of front-end.
> (ie, a gui for a semantic database)
>
> For that purpose, I wanted to write a python script that asks the
> backend for data and creates a diagram representing the network.
>
> Unfortunately, after hours of searching,
> documentation/faq/mailing-list-archive reading I couldnt find a way, how
> to create diagram objects via the python interface.
If it is just creating objects via the python interface you should find 
something like
  obj, h1, h2 = dia.get_object_type(oname).create (0, 0)
in every other PyDia sample. It is also kind of documnted in 
http://git.gnome.org/browse/dia/plain/samples/Self/PyDiaObjects.dia

> I know, how to get information from the diagram, but not how to add new
> objects (like a flowchart-box, etc).
  obj, h1, h2 = dia.get_object_type ("Flowchart - Box").create (0, 0)
  layer.add_object (obj)

> perhaps I am blind...
Maybe I'm too ;) At first I thought you wanted to implement Dia object 
types in Python. That indeed is not possible at the moment. And doing so 
would probably require to restructure a lot of the object interface and 
related objects, because an object's implmentation has to maintain a lot of 
internal state in 'public' variables, e.g. Object::position, 
Object::bounding_box, etc.

> If so, I'd appreciate some help / information on how to do this.
With a Python-enabled Dia you should take a closer look into the help menu. 
There are some diagrams and html created to help developing with PyDia.

Regards,
        Hans

-------- Hans "at" Breuer "dot" Org -----------
Tell me what you need, and I'll tell you how to
get along without it.                -- Dilbert