[QGIS-Developer] use of clone

[Antonio Locandro]

That would probably be the correct issue. I wrote some "working" code for the developer to have as starting basis so probably the AI as you mentioned added some garbage to it. Unfortunately, I tested it on my local machine, and it seemed to work for me but maybe I was not paying too much attention to it. Will try as you describe and make sure to check thoroughly the docs.

Thanks for the quick reply.
________________________________
From: Nyall Dawson <nyall.dawson at gmail.com>
Sent: Tuesday, July 8, 2025 6:06 PM
To: Antonio Locandro <antoniolocandro at hotmail.com>
Cc: qgis-developer at lists.osgeo.org <qgis-developer at lists.osgeo.org>
Subject: Re: [QGIS-Developer] use of clone

On Wed, 9 Jul 2025 at 09:41, Antonio Locandro
<antoniolocandro at hotmail.com> wrote:
>
> True! Sorry I was just eager to get some help. The code is probably not so good, we are just learning with my dev which makes it a bit more interesting the questions. This used to work a few weeks ago maybe 2-3 weeks.
>
>     for feat in point_layer.getFeatures():
>         geom = feat.geometry()
>         if point_crs != project_crs:
>             geom = geom.clone()
>             geom.transform(transform_point_to_project)
>         if surface_geom.intersects(geom):
>             new_feat = QgsFeature(feat)
>             new_feat.setGeometry(geom)
>             provider.addFeatures([new_feat])
>             result['features'].append(new_feat)
>             result['count'] += 1

This code, as it's written, would NEVER have worked. Maybe you use an
AI at some stage to fix something and it broke the code?

Try:

     for feat in point_layer.getFeatures():
         geom = feat.geometry()
         if point_crs != project_crs:
             # no need to clone!
             geom.transform(transform_point_to_project)
         if surface_geom.intersects(geom):
             new_feat = QgsFeature(feat)
             new_feat.setGeometry(geom)
             provider.addFeatures([new_feat])
             result['features'].append(new_feat)
             result['count'] += 1

Or:

     request = QgsFeatureRequest()
     request.setDestinationCrs(project_crs,
QgsProject.instance().transformContext())
     for feat in point_layer.getFeatures(request):
         geom = feat.geometry()
         # no need to transform, it's now done for us!
         if surface_geom.intersects(geom):
             new_feat = QgsFeature(feat)
             new_feat.setGeometry(geom)
             provider.addFeatures([new_feat])
             result['features'].append(new_feat)
             result['count'] += 1

>
>
> Then I tried this and I get that clone() is not available
>
> geom = QgsGeometry.fromWkt("POINT(0 0)")
> try:
> cloned = geom.clone()
> print("clone() is available:", type(cloned))
> except AttributeError:
> print("clone() is NOT available on QgsGeometry")
> clone() is NOT available on QgsGeometry
>
> So we have found an alternative but still wondering what we had wrong to avoid in the future.
> ________________________________
> From: Nyall Dawson <nyall.dawson at gmail.com>
> Sent: Sunday, June 29, 2025 7:44 PM
> To: Antonio Locandro <antoniolocandro at hotmail.com>
> Cc: qgis-developer at lists.osgeo.org <qgis-developer at lists.osgeo.org>
> Subject: Re: [QGIS-Developer] use of clone
>
>
>
> On Sun, 29 Jun 2025 at 03:08, Antonio Locandro via QGIS-Developer <qgis-developer at lists.osgeo.org> wrote:
> >
> > Hello all!
> >
> > I had a script that used copy_geom = geom.clone() and worked until today that I updated QGIS.
>
> > Any thoughts?
>
> Yes  -- "it used to work" is not useful information at all! 🤪
>
> Describe the actual error, including exception messages if appropriate. Include sample code so that we actually have some idea of what you're talking about. And never, EVER just tell developers "it doesn't work" without providing an excessive level of detail. 😜
>
> Nyall
>
>
>
> > _______________________________________________
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