[Qgis-developer] Make valid in master

[Andrea Peri]

It should be applied only when the test IsValid fail.
This should limit the slowness.
Also pay attention that something the result of a MakeValid on an Invalid
poligon could be a MultiPolygon or also a Collection.
So to use it in an automatic manner need to apply also a
ST_Multi(CollectionExtract(ST_MakeValid(geometry),3)).
To be sure that it is always a geometry of the same kind.

A.




2014/1/16 Larry Shaffer <larrys at dakotacarto.com>

> Hi Paolo,
>
>
> On Wed, Jan 15, 2014 at 11:35 PM, Paolo Cavallini <cavallini at faunalia.it>wrote:
>
>> Hi all.
>> To the best of my knowledge, our make clean command, available through
>> the Processing subplugin:
>>
>> http://plugins.qgis.org/plugins/processinglwgeomprovider/
>>
>> is the most effective method to clean up invalid geometries.
>> I would therefore suggest to include it in master, in order to have it
>> available straight away for everybody.
>> This depends on lwgeom, available at least on Debian and Windows.
>>
>
> I have recently made a Homebrew formula for Mac that allows liblwgeom to
> be built without Postgres/PostGIS installs (a bit of a hack, actually). So,
> the standalone lib is now readily available on Mac OS X as well [0].
>
> +1 for this to be included in QgsGeometry or similar class.
>
> It would help solve labeling issues where the extents-clipped geometry is
> invalid. Would slow rendering down, of course, but would be good to have as
> an option for faster machines and print jobs. Note: the validity fix would
> be applied to the duplicates of feature geometries, which are used by PAL.
>
> [0]
> https://github.com/Homebrew/homebrew/blob/master/Library/Formula/liblwgeom.rb
>
> Larry
>
>
>
>
>> Opinions? Any blockers?
>>
>> All the best.
>> --
>> Paolo Cavallini - www.faunalia.eu
>> QGIS & PostGIS courses: http://www.faunalia.eu/training.html
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>>
>
>
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-- 
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
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