[Qgis-user] Support - representing a graph in Qgis

[Giacomo Uguccioni]

Thank you guys for the support.
Could I work with Graphviz in the python console inside Qgis? And does
Graphviz support shapefiles or similar as an input?

Il giorno mar 9 feb 2021 alle 20:07 Jorge Gustavo Rocha <jgr at geomaster.pt>
ha scritto:

> Hi,
>
> I second Chris's proposal. Using graphviz python module [1], you can
> generate your graph by iterating over the features.
>
> At the end, just call the render and you will get the rendered graph (just
> add view=True) within your QGIS environment. You need to know some Python
> basic stuff, but not much than the basic.
>
> Regards,
>
> Jorge Gustavo
>
> [1] https://graphviz.readthedocs.io/en/stable/manual.html
> Às 18:55 de 09/02/21, chris hermansen escreveu:
>
> Giacomo and list,
>
> On Tue, Feb 9, 2021 at 8:07 AM Giacomo Uguccioni <
> giacomo.uguccioni at gmail.com> wrote:
>
>> Hello everyone, and thanks for the support.
>> If this is not the place to ask for this kind of thing, I ask you to give
>> me a link where I could find support.
>> I'm a qgis 3.14 user. I would like to represent a tree diagram or
>> functional diagram being able to draw the symbology and position of nodes
>> and connections from the information contained in the attribute table.
>> Example: I would like to represent the medium voltage grid of a city as an
>> electrical diagram; I would like to represent with lines that join at nodes
>> the roads that connect certain houses and schools in a city. So my goal is
>> to be able to build a layout with symbology of nodes and connections
>> derived from information contained in different shapefiles or within
>> features, with a non-geographic but schematic / ideal criterion.
>> Do you have any ideas or suggestions on how to do it? I thank you for
>> every contribution.
>>
>>
> Not a QGIS-based solution, but I've used graphviz <https://graphviz.org/>
> to generate graphs from the command line with considerable success.  It
> offers a small but useful programming language that can be combined with
> data in text files in a really useful way.
>
> --
> Chris Hermansen · clhermansen "at" gmail "dot" com
>
> C'est ma façon de parler.
>
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*Giacomo Uguccioni*
*Geospatial Data Acquisition & Processing*
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