polygonqgisselect
I've created a polygon from lines in a couple of cases where I'm unable to select the polygon using the standard Select Features button. I am able to select the feature using the Attributes Table, but in neither case am I able to actually cut and paste the polygon from that layer to another layer.
Any ideas?
(Using QGIS 2.18 on OSX)
You can use the layer.filter property on the vector layer then refresh the layer.
layer.filter = new OpenLayers.Filter.Spatial({
type: OpenLayers.Filter.Spatial.INTERSECTS,
value: event.feature.geometry
});
layer.refresh({force: true});
Granted this will make all the non-selected layers disappear, but you can possibly do this just to collect the array of features (without refreshing the layer) then use the SelectFeature class to select only the ones the filter returned.
Another method which I don't think you mentioned is to first create a new polygon shapefile:
Layer > New > New Shapefile Layer...
Then select Polygon in the options and click OK. Toggle the Edit button for both the new layer and the layer you want to copy the polygons from.
Copy your polygons and paste them into the new shapefile. If there are no errors then the polygons along with their associated attributes should be copied.
Best Answer
Your polygon isn't closed. If you open the Log Messages Panel you'll see a message on the GEOS tab: