I have eventually worked out the issue.
As I thought the use of .addGeometry() meant I was adding new polygons and the
previous ones were not being deleted. This was because the object
self.rubberband in my script was not persisting through my code and so I
replaced it with an variable defined at a higher level (i.e. rubberbandList =
{}) and that allowed me to use the scene().removeItem() successfully.
Hope that is helpful to others.
Paul
From: Paul Wittle
Sent: 22 September 2020 14:52
To: Florian Heyder <[email protected]>
Subject: RE: [QGIS-Developer] Remove all rubberbands from the canvas
Hi,
Thanks for the tip; I have indeed tried that and whilst it doesn’t error the
rubber band is not removed either.
The scene() object is really odd as well as it is barely in any documentation,
I certainly can’t find it in the API reference.
A bit of a mystery really but I suspect I’m accidentally adding the rubber band
multiple times and then only removing one of them…but I can’t see why at the
moment.
Cheers,
Paul
From: Florian Heyder
<[email protected]<mailto:[email protected]>>
Sent: 22 September 2020 10:59
To: Paul Wittle <[email protected]<mailto:[email protected]>>
Subject: Re: [QGIS-Developer] Remove all rubberbands from the canvas
Try this, you have to remove from scene:
https://webgeodatavore.github.io/pyqgis-samples/gui-group/QgsRubberBand.html
On Tue, Sep 22, 2020 at 4:01 AM Paul Wittle
<[email protected]<mailto:[email protected]>>
wrote:
Hi,
I’m having an issue with the documentation this morning. I’m writing a small
python plugin and adding rubberbands to the canvas which is fine but for some
reason I can’t seem to remove them from the canvas at the end.
To start with, this is because I’d not put anything in to remove them but now
I’m using the iface.mapCanvas.scene().removeItem() function and they still are
present.
I have two questions really:
1. I can’t see scene defined in the documentation for QgsMapCanvas; is
this something that should be there?
2. Is there a way to simply remove all scenes from the canvas?
Any help would be great 😊
Thanks,
Paul Wittle
[cid:[email protected]]<https://www.dorsetcouncil.gov.uk/>
Business Solutions Analyst (GIS)
ICT Operations
Dorset Council
01305 228473
<tel:01305%20228473%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20>
dorsetcouncil.gov.uk<https://www.dorsetcouncil.gov.uk>
[cid:[email protected]]<https://www.facebook.com/DorsetCouncilUK>
[cid:[email protected]]<https://instagram.com/DorsetCouncilUK>
[cid:[email protected]]<https://twitter.com/DorsetCouncilUK>
This e-mail and any files transmitted with it are intended solely for the use
of the individual or entity to whom they are addressed. It may contain
unclassified but sensitive or protectively marked material and should be
handled accordingly. Unless you are the named addressee (or authorised to
receive it for the addressee) you may not copy or use it, or disclose it to
anyone else. If you have received this transmission in error please notify the
sender immediately. All traffic may be subject to recording and/or monitoring
in accordance with relevant legislation. Any views expressed in this message
are those of the individual sender, except where the sender specifies and with
authority, states them to be the views of Dorset Council. Dorset Council does
not accept service of documents by fax or other electronic means. Virus
checking: Whilst all reasonable steps have been taken to ensure that this
electronic communication and its attachments whether encoded, encrypted or
otherwise supplied are free from computer viruses, Dorset Council accepts no
liability in respect of any loss, cost, damage or expense suffered as a result
of accessing this message or any of its attachments. For information on how
Dorset Council processes your information, please see
www.dorsetcouncil.gov.uk/416433<http://www.dorsetcouncil.gov.uk/416433>
_______________________________________________
QGIS-Developer mailing list
[email protected]<mailto:[email protected]>
List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
This e-mail and any files transmitted with it are intended solely for the use
of the individual or entity to whom they are addressed. It may contain
unclassified but sensitive or protectively marked material and should be
handled accordingly. Unless you are the named addressee (or authorised to
receive it for the addressee) you may not copy or use it, or disclose it to
anyone else. If you have received this transmission in error please notify the
sender immediately. All traffic may be subject to recording and/or monitoring
in accordance with relevant legislation. Any views expressed in this message
are those of the individual sender, except where the sender specifies and with
authority, states them to be the views of Dorset Council. Dorset Council does
not accept service of documents by fax or other electronic means. Virus
checking: Whilst all reasonable steps have been taken to ensure that this
electronic communication and its attachments whether encoded, encrypted or
otherwise supplied are free from computer viruses, Dorset Council accepts no
liability in respect of any loss, cost, damage or expense suffered as a result
of accessing this message or any of its attachments. For information on how
Dorset Council processes your information, please see
www.dorsetcouncil.gov.uk/416433
_______________________________________________
QGIS-Developer mailing list
[email protected]
List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
