[Qgis-user] Vector Layer Translate Feature

[Pietro Panzeri]

Il Monday 30 March 2009 14:43:49 Carson Farmer ha scritto:
> Pietro,
>
> > I'm writing a Python plugin to allow the user to translate a whole vector
> > layer by a given shift.
> >
> > I use the translateFeature() of the QgsVectorLayer class but if the layer
> > is zoomed the function translates only the visualized features.
> >
> > Can someone point me a way to act on the whole layer regardless of the
> > current zoom?
>
> In your provider.select() call, what do you use for the spatial filter?
> If you want to run through all features in the layer, make sure you
> don't specify any bounds in the rect variable:
>
> attrs = provider.attributeIndexes()
> provider.select(attrs)
>
> or if that doesn't work, specify the extent of the layer as the rect
> using layer.extent(), which is inherited from QgsMapLayer...
>
> Cheers,
>
> Carson

I use the following code:

vlayer = iface.activeLayer()

provider = vlayer.dataProvider()
attrs = provider.attributeIndexes()
provider.select(attrs)

f = QgsFeature()

while provider.nextFeature(f):
	error_code = vlayer.translateFeature(f.id(), delta_x, delta_y)


If the feature to translate is not one of the visualized features, the 
error_code is 1 and the feature is not translated.


I don't know if this is the correct approach. Please tell me where I'm doing 
wrong.

Thank you.

Pietro

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Pietro Panzeri

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