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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I have eventually worked out the issue.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">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.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hope that is helpful to others.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Paul<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Paul Wittle
<br>
<b>Sent:</b> 22 September 2020 14:52<br>
<b>To:</b> Florian Heyder <Florian.J.Heyder@gmail.com><br>
<b>Subject:</b> RE: [QGIS-Developer] Remove all rubberbands from the canvas<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Thanks for the tip; I have indeed tried that and whilst it doesn’t error the rubber band is not removed either.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">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.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Paul <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Florian Heyder <<a href="mailto:Florian.J.Heyder@gmail.com">Florian.J.Heyder@gmail.com</a>>
<br>
<b>Sent:</b> 22 September 2020 10:59<br>
<b>To:</b> Paul Wittle <<a href="mailto:P.Wittle@dorsetcc.gov.uk">P.Wittle@dorsetcc.gov.uk</a>><br>
<b>Subject:</b> Re: [QGIS-Developer] Remove all rubberbands from the canvas<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Try this, you have to remove from scene:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><a href="https://webgeodatavore.github.io/pyqgis-samples/gui-group/QgsRubberBand.html">https://webgeodatavore.github.io/pyqgis-samples/gui-group/QgsRubberBand.html</a> <o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, Sep 22, 2020 at 4:01 AM Paul Wittle <<a href="mailto:paul.wittle@dorsetcouncil.gov.uk">paul.wittle@dorsetcouncil.gov.uk</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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. <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">To start with, this is because I’d not put anything in to remove them but now I’m using the
<span style="font-size:9.5pt;font-family:Consolas;color:black">iface.mapCanvas.scene().removeItem() function and they still are present.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:9.5pt;font-family:Consolas;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:9.5pt;font-family:Consolas;color:black">I have two questions really:</span><o:p></o:p></p>
<p class="gmail-m4378110487867649257msolistparagraph" style="margin-left:41.4pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>I can’t see scene defined in the documentation for QgsMapCanvas; is this something that should be there?<o:p></o:p></p>
<p class="gmail-m4378110487867649257msolistparagraph" style="margin-left:41.4pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Is there a way to simply remove all scenes from the canvas?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Any help would be great
<span style="font-family:"Segoe UI Emoji",sans-serif">😊</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:11.5pt;font-family:"Arial",sans-serif">Paul Wittle
</span></b><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="https://www.dorsetcouncil.gov.uk/" target="_blank"><span style="color:windowtext;text-decoration:none"><img border="0" width="227" height="97" style="width:2.3666in;height:1.0083in" id="gmail-m_4378110487867649257Picture_x0020_1" src="cid:image005.jpg@01D69102.D1AB60C0"></span></a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-family:"Arial",sans-serif">Business Solutions Analyst (GIS)</span></b><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-family:"Arial",sans-serif">Dorset Council</span></b><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif"><a href="tel:01305%20228473%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20" target="_blank">01305 228473
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif"><a href="https://www.dorsetcouncil.gov.uk" target="_blank">dorsetcouncil.gov.uk</a></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="https://www.facebook.com/DorsetCouncilUK" target="_blank"><span style="color:windowtext;text-decoration:none"><img border="0" width="46" height="46" style="width:.4833in;height:.4833in" id="gmail-m_4378110487867649257Picture_x0020_2" src="cid:image006.png@01D69102.D1AB60C0"></span></a><o:p></o:p></p>
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