[Qgis-developer] Create memory layer containing only features visible in current canvas extent

[Tom Chadwin]

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



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