Hey Andrea,
you can do it *if* your data source (or rather the provider that QGIS
uses for your data source) supports spatial queries for the provider
feature filtering.
Our "Räumlicher Filter" plugin does exactly that using setSubsetString :))
* https://github.com/WhereGroup/spatial_filter
* https://plugins.qgis.org/plugins/spatial_filter/
Try it and look at the resulting filter queries or check how we
construct the filter strings:
*
https://github.com/WhereGroup/spatial_filter/blob/e77abb9830f5d46073239b8e7376c52a69046223/filters.py#L14
*
https://github.com/WhereGroup/spatial_filter/blob/e77abb9830f5d46073239b8e7376c52a69046223/filters.py#L45
As of now, the plugin supports it for PostGIS, GPKG and Spatialite
layers . It probably is easy to adapt for other geospatial databases too.
Cheers, Hannes
Am 12.04.23 um 09:35 schrieb andrea antonello via QGIS-User:
Hello,
I was wondering if in pyqgis there is a way to load a layer to show
only features that intersect a certain geometry. I see
the setSubsetString for sql like queries, but no way to do this with
geometries.
Similar to this (but only applied to iterations using getFeatures), I
was wondering if with QgsFeatureRequest and expressions there is a way
to create a geometry intersection filter (I saw the setFilterRect).
Thanks a lot for any hint,
Andrea
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