Hi, Seem a good candidate for PyQGIS Cookbook ... Regards, Harrissou
2017-01-12 17:43 GMT+01:00 Martin Dobias <[email protected]>: > Hi Tom > > Try something like this: > > request = QgsFeatureRequest(iface.mapCanvas().extent()) > request.setFlags(QgsFeatureRequest.ExactIntersect) > for f in layer.getFeatures(r): > print f.id() > > This feature request will only use features that intersect canvas > view. The extra flag ExactIntersect is there to make sure that true > intersection test is done, rather just doing fast intersection of > geometry's bounding box with the canvas extent recangle. > > Cheers > Martin > > On Fri, Jan 13, 2017 at 12:07 AM, Tom Chadwin <[email protected]> > wrote: > > Hello all > > > > I currently create a memory layer from an existing layer as follows > > ('usedFields' is a subset of the original layer's attributes/fields): > > > > newlayer = QgsVectorLayer(uri, layer.name(), 'memory') > > writer = newlayer.dataProvider() > > outFeat = QgsFeature() > > for feature in layer.getFeatures(): > > if feature.geometry() is not None: > > outFeat.setGeometry(feature.geometry()) > > attrs = [feature[f] for f in usedFields] > > if attrs: > > outFeat.setAttributes(attrs) > > writer.addFeatures([outFeat]) > > > > What is the best way to add only features visible in the current QGIS > view > > of the canvas, rather than every feature in the layer? > > > > Thanks > > > > Tom > > > > > > > > ----- > > Buy Pie Spy: Adventures in British pastry 2010-11 on Amazon > > -- > > View this message in context: http://osgeo-org.1560.x6. > nabble.com/Create-memory-layer-containing-only- > features-visible-in-current-canvas-extent-tp5303218.html > > Sent from the Quantum GIS - Developer mailing list archive at Nabble.com. > > _______________________________________________ > > Qgis-developer mailing list > > [email protected] > > List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer > > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer > _______________________________________________ > Qgis-developer mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer >
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