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<p class="MsoNormal">Hi!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I was trying to visualize a linestring using the QgsGeometryRubberBand and had QGIS crashing as soon as the rubber band was being drawn. It looks like the geometry is being corrupted somewhere.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If I draw a polygon it works fine:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">from qgis.core import *<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">from qgis.gui import *<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">rb = QgsGeometryRubberBand(iface.mapCanvas(), QGis.Polygon)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">g = QgsGeometry.fromWkt('POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))')<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">rb.setGeometry(g.geometry().clone())<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If I draw a line instead QGIS crashes:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">from qgis.core import *<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">from qgis.gui import *<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">rb = QgsGeometryRubberBand(iface.mapCanvas(), QGis.Line)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">g = QgsGeometry.fromWkt('LINESTRING(0 0, 1 1)')<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">rb.setGeometry(g.geometry().clone())<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The crash happens at: </span><a href="https://github.com/qgis/QGIS/blob/release-2_18/src/gui/qgsgeometryrubberband.cpp#L57"><span lang="EN-US">https://github.com/qgis/QGIS/blob/release-2_18/src/gui/qgsgeometryrubberband.cpp#L57</span></a><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">QgsAbstractGeometryV2* paintGeom = <span class="pl-smi">
mGeometry</span>-><span class="pl-c1">clone</span>();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is it a difference in the deep copy/clone mechanism that fails somehow, since I guess that the problem arises in the cloning of the abstract geometry in my two samples and not in line 57 of qgsgeometryrubberband.cpp?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards, Casper<o:p></o:p></span></p>
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