[Qgis-developer] Performing buffering with script in PyQGIS

[marco.oliverio at libero.it]

I wrote a script that performs the intersection of two layers:


-the first Layer-> layer1 represents the rivers


-the second Layer-> layer2, represents a set of circular dots
 distributed in a geographical area (at each point corresponds to a 
numeric value that exceeds a threshold value)


The result of the intersection should be highlighted with an operation of buffering.

The new geometry formed by the intersection + buffering should look like this:




Writing from console PyQGIS I have not encountered any errors.

To see the new geometry I added new layers to the previous ones (from "add vector layer") but I have not seen anything new.


This is the code of my script:


from qgis.core import *

from qgis.gui import *


canvas = qgis.utils.iface.mapCanvas()


layers = canvas.layers()

layer1 = canvas.layer(0)

layer2 = canvas.layer(3) 


from qgis.analysis import * 


overlayAnalyzer = QgsOverlayAnalyzer()

overlayAnalyzer.intersection(layer1, layer2, "/home/..../Scrivania/..../output.shp") 


layer3 = canvas.layer(0)


geometryanalyzer = QgsGeometryAnalyzer()

geometryanalyzer.buffer(layer3, "/home/..../Scrivania/..../buffer.shp", 500, False, False, -1)


Tips ?Also Demo & Plugin example that I can study


I'm working with QGIS 2.4 on Win 7

Thanks in advance
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