[Qgis-developer] Complex symbology: multiple classifications for different graphical variables

Nathan Woodrow madmanwoo at gmail.com
Tue Nov 27 01:56:27 PST 2012

Yes I agree this would be very handy and something I was thinking about how
to tackle today.  Larry has been working on some stuff for the data-defined
labels to make it easier to use from the UI and the code so I'm thinking we
can use the same code for that in the symbols.

I would also like to be able to bind controls together, things like fill
and outline so they always stay in sync.  I have a few ideas how this could
work so I'm going to try and have a go at some stage, or at least draft up
the idea more.

- Nathan

On Tue, Nov 27, 2012 at 6:35 PM, Andreas Neumann <a.neumann at carto.net>wrote:

> Hi,
> In many of my projects I need to do several classifications for different
> graphical variables, like fill-color, stroke-color, size, orientation, etc.
> As an example I need to represesent manholes where the symbol shape (SVG)
> is based on manhole type, the symbol stroke colors based on the usage, and
> the size based on dimensions.
> I know that it is currently possible to reach this goal by either
> * using the rule based renderer - it would result in a lot of rules or
> refined rules - a lot of work
> * or concatenating the three attribute values into one attribute and using
> the unique value renderer - but this results in many, many combinations.
> Too many classes to handle.
> So my question/suggestion:
> Can we introduce multiple parallel/simultaneous categorized
> classifications where each attributes controls one visual variable?
> I don't know how one could display a legend then with such parallel
> classifications ... but other than that it would be more convenient for the
> user.
> There may also be technical issues making this impossible.
> Any thoughts on this?
> Andreas
> --
> --
> Andreas Neumann
> Böschacherstrasse 10A
> 8624 Grüt (Gossau ZH)
> Switzerland
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