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

[Anita Graser]

+1 I had this requirement too. But I can also imagine that this might
get very tricky to implement - at least GUI-wise. In my opinion it
would already help a lot if we could have data-defined styling.

So far, I've solved these problems by writing a script that creates
all combinations of rules but that's not an option for casual users.

Best wishes,
Anita

On Tue, Nov 27, 2012 at 9:35 AM, 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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