[Qgis-developer] Complex symbology: multiple classifications for different graphical variables
a.neumann at carto.net
Wed Nov 28 01:33:29 PST 2012
Thank you for putting some thoughts into this problem.
Should I open a feature request ticket?
On Tue, 27 Nov 2012 19:56:27 +1000, Nathan Woodrow wrote:
> 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
> 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
> least draft up the idea more.
> - Nathan
> On Tue, Nov 27, 2012 at 6:35 PM, Andreas Neumann wrote:
>> 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 Neumann
>> Böschacherstrasse 10A
>> 8624 Grüt (Gossau ZH)
>> Qgis-developer mailing list
>> Qgis-developer at lists.osgeo.org 
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8624 Grüt (Gossau ZH)
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