[Qgis-developer] Teaching Processing: notes from the wild

[Paolo Cavallini]

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Hi Alex,
thanks for your replies - notes below.

Il 18/10/2013 19:43, Alexander Bruy ha scritto:
> Hi,
> 
> 2013/10/18 Paolo Cavallini <cavallini at faunalia.it>:
>> * Random selection: the selection does not appear, as the module is not refreshing
>> the view
> Seems fixed in master. Also similar bug was closed about 5 days ago, see
> https://hub.qgis.org/issues/8127#change-45578

so, why not releasing a new version right now? This could also incorporate the many
improvements to modules that Giovanni did recently.
> 
>> * Split randomly: the % is not exact (e.g. if I select a 20/80 split, I get 22/78 etc.)
> I can see only SAGA algorithm with this name. Not sure, but seems this is
> upstream (SAGA) bug.
> 
>> * Create graticule from extent: with lines, one of the points (first North-West) is
>> left out; with polygons it is ok
> Seems same as previous.

could anyone confirm and open a ticket upstream then, for both?
> 
>> * In the Log viewer, the button Cancel is misleading, and can lead to loss of
>> important data a bit too easily; better to give a warning before actually deleting
> I suppose you mean Clear button, right? Added in master just now.

one more reason for the upgrade ;)
> 
>> * the Field calculator is barely usable without a dropdown list of fields and
>> functions; on win it does not seem to work (most or all calculations end up with all
>> NULLs); unclear if this is due to minor edit issues from users (quite likely without
>> the dropdowns)
> Maybe I'm wrong, but currently there is no way to create such widgets
> and use them
> in Processing algorithms.

this is also what I understand
> 
>> * it seems impossible to make conditional models (if this value is ... then run this
>> command, else this other one): am I correct? this would be a major improvement IMHO
> Yes, there are no support for conditional expressions and loops in modeler.
> I don't remember exactly, but this is a complex issue and adding such feature
> will require a lot of work.

ok - should I open tickets then, not to forget for future implementation?

thanks.
- -- 
Paolo Cavallini - Faunalia
www.faunalia.eu
Full contact details at www.faunalia.eu/pc
Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario
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