[Qgis-developer] secondary mapCanvas and memory layer

[Massimo]

Hi,

I would like to show my spatial analysis results using a temporary "memory"
vector layer in a secondary mapCanvas hosted inside a python plugin widget.

I'dont know exactly:
- how to clone/copy a feature from an existing layer to a new temp "memory"
vector layer
- how to add the temp layer to my mapCanvas instance since
qgsMapLayerRegistry has only one global instance used by the qgis mapCanvas

The following code produces strange behaviours:
temp_layer = QgsVectorLayer('Polygon', 'temp_layer', 'memory')
temp_layer_provider = temp_layer.dataProvider()
temp_layer_provider.addFeatures([intersected_feature])
canvas_layer = QgsMapCanvasLayer (temp_layer)
self.map_canvas.setLayerSet([canvas_layer])
self.map_canvas.setExtent(temp_layer.extent())


Any help will be very appreciated.

Massimo





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