Thanks for the reply.
I am using QGIS master from OSGeo4W. At the moment I am just trying to get the
example in the test to work. But it always falls over at beginRender(). My
vector layer is a query from a PostGIS database.
Code is below (as you can see it is pretty much the same as the test code):
query = """(SELECT * From test.tablename WHERE substring(knrgnrbnr
from 1 for 4) = '""" + KommuneNr + """')"""
vlayer = loadPostGISLayerQuery("localhost", "5432", "database",
"user", "password",query,"geom","gid","layername")
QgsMapLayerRegistry.instance().addMapLayer(vlayer)
mMapRenderer = QgsMapRenderer()
layerStringList = QStringList()
layerStringList.append( vlayer.id() )
mMapRenderer.setLayerSet( layerStringList )
mMapRenderer.setProjectionsEnabled( True )
crs = QgsCoordinateReferenceSystem()
crs.createFromSrid( 32632 )
mMapRenderer.setDestinationCrs( crs )
mComposition = QgsComposition( mMapRenderer )
mComposition.setPaperSize( 297, 210 )
props = { "color": "0,127,0" }
fillSymbol = QgsFillSymbolV2.createSimple( props )
renderer = QgsSingleSymbolRendererV2( fillSymbol )
vlayer.setRendererV2( renderer )
mAtlasMap = QgsComposerMap( mComposition, 20, 20, 130, 130 )
mAtlasMap.setFrameEnabled( True )
mComposition.addComposerMap( mAtlasMap )
mAtlas = QgsAtlasComposition( mComposition )
mAtlas.setCoverageLayer( vlayer )
mAtlas.setComposerMap( mAtlasMap )
mAtlas.setFilenamePattern( "'output_' || $feature" )
mAtlas.beginRender()
for i in range(0, mAtlas.numFeatures()):
mAtlas.prepareForFeature( i )
expected = QString( "output_%1" ).arg(i+1)
assert mAtlas.currentFilename() == expected
mAtlas.endRender()
-----Opprinnelig melding-----
Fra: [email protected]
[mailto:[email protected]] På vegne av Hugo Mercier
Sendt: 11. april 2013 10:16
Til: [email protected]
Emne: Re: [Qgis-developer] qgsAtlasComposition
Hi James,
Le 11/04/2013 08:37, Stott James a écrit :
> Hi all,
>
> I am trying to use the atlas functionality in a standalone python script. I
> am using the qgsAtlasComposition class. I get an error running this line:
>
> myAtlas.beginRender()
>
> I get an unknown exception.
Can you share the code you're using ? Or a stack trace or a line number where
the error occurs ?
What version / git revision are you using ?
You have to call setCoverageLayer and setComposerMap before calling
beginRender(), is it the case ?
>
> I have also found that running myAtlas.numFeatures() always returns 0 even
> though I have added a layer that has data using setCoverageLayer().
This is linked to the previous issue. Features are iterated over during
beginRender()
>
> I did take a look at this page and followed the steps in the test:
>
> https://github.com/qgis/Quantum-GIS/blob/master/tests/src/python/test_
> qgsatlascomposition.py
>
> but I cannot get it to work in my script. I cannot get the test to work
> either. It always errors on the beginRender() line.
I was about to say everything work fine here, but ... I realized there is
something wrong with the last changes I did.
Should be fixed with this:
https://github.com/qgis/Quantum-GIS/pull/516
Not sure if it will fix your problem ...
--
Hugo Mercier
Oslandia
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