[Qgis-developer] update plugin to QGIS 2.0
Otto Dassau
dassau at gbd-consult.de
Fri Aug 2 08:21:42 PDT 2013
Hi Etienne and Matthias,
fine - that was missing.
Thanks a lot
Otto
Am Fri, 2 Aug 2013 12:04:09 -0300
schrieb Etienne Tourigny <etourigny.dev at gmail.com>:
> On Fri, Aug 2, 2013 at 11:58 AM, Otto Dassau <dassau at gbd-consult.de> wrote:
> > Hi,
> >
> > thanks for the hint. And if I need the value of the raster? If I
> > understand correctly, ident will always be 1, if I have a 1 band raster
> > layer. But how can I get the value at QgsPoint(x,y) of the raster? I
> > don't understand that from the value tool plugin.
>
> no, ident will be a dict with an element of key 1
>
> you get exactly the fist band's value at the point with ident[1] .
>
> the key of the map is the band number, and the value is the value (or
> None if nodata/out of bounds)
>
> so without any error checking you would do
>
> ident =
> layer.dataProvider().identify(QgsPoint(x,y),QgsRaster.IdentifyFormatValue).results()
> return ident[1]
>
> cheers
> Etienne
>
> >
> > In QGIS 1.8 I use :
> >
> > success, data = layer.identify(QgsPoint(x,y))
> > for band, value in data.items():
> > return value
> >
> > and in QGIS 2.0:
> >
> > ident =
> > layer.dataProvider().identify(QgsPoint(x,y),QgsRaster.IdentifyFormatValue).results() ?
> >
> > Thanks again
> >
> > Otto
> >
> >
> > Am Fri, 2 Aug 2013 08:50:08 -0300
> > schrieb Etienne Tourigny <etourigny.dev at gmail.com>:
> >
> >> from the api
> >> http://www.qgis.org/api/classQgsRasterIdentifyResult.html#a8537d25fdff215e7e9650b71a0a16783
> >>
> >> results() returns a QMap<int, QVariant> (one item for each band), it
> >> does not return a tuple, so you should actually call
> >>
> >> ident =
> >> layer.dataProvider().identify(QgsPoint(x,y),QgsRaster.IdentifyFormatValue).results()
> >>
> >> and then test that ident is not empty (i,e. ident is not None and
> >> ident.iterkeys() is not None)
> >>
> >> for each band, if the point is outside of the raster extent or is
> >> nodata, the value will be a null QVariant (i.e. QVariant()) which in
> >> python is None.
> >>
> >>
> >> cheers
> >> Etienne
> >>
> >> On Fri, Aug 2, 2013 at 7:13 AM, Otto Dassau <dassau at gbd-consult.de>
> >> wrote:
> >> >
> >> > Hi,
> >> >
> >> > thanks for your hints, I think I am on the right track now. I had a
> >> > look at the value tool plugin and tried to adapt the method
> >> > accordingly:
> >> >
> >> > def sampleRaster20(self, layer, x, y):
> >> > #success, data = layer.dataProvider().identify(QgsPoint(x,y))
> >> > success, data =
> >> > layer.dataProvider().identify(QgsPoint(x,y),QgsRaster.IdentifyFormatValue).results()
> >> > for band, value in data.items(): return value
> >> >
> >> > But now I get another error message
> >> >
> >> > File
> >> > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > line 448, in printValue self.showValues() File
> >> > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > line 454, in showValues self.plot() File
> >> > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > line 526, in plot w =
> >> > float(self.sampleRaster(self.InRastW.currentText(), self.xCoord,
> >> > self.yCoord))/10 File
> >> > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > line 300, in sampleRaster return self.sampleRaster20(layer, x, y) File
> >> > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > line 285, in sampleRaster20 success, data =
> >> > layer.dataProvider().identify(QgsPoint(x,y),
> >> > QgsRaster.IdentifyFormatValue ).results() ValueError: need more than 1
> >> > value to unpack
> >> >
> >> > Do you have an idea for this, too?
> >> >
> >> > Thanks
> >> > Otto
> >> >
> >> > Am Thu, 1 Aug 2013 16:00:08 -0300
> >> > schrieb Etienne Tourigny <etourigny.dev at gmail.com>:
> >> >
> >> > > Have a look at the source of the value tool plugin, it calls the
> >> > > identify() method and has been updated to 2.0 api.
> >> > >
> >> > > Etienne
> >> > >
> >> > > On Thu, Aug 1, 2013 at 1:58 PM, Otto Dassau <dassau at gbd-consult.de>
> >> > > wrote:
> >> > >
> >> > > > Hi,
> >> > > >
> >> > > > I want to update a plugin from 1.8 to QGIS 2.0 and it throws
> >> > > > following error:
> >> > > >
> >> > > > Traceback (most recent call last):
> >> > > > File
> >> > > >
> >> > > >
> >> > > > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > > > line 447, in printValue self.showValues() File
> >> > > >
> >> > > >
> >> > > > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > > > line 453, in showValues self.plot() File
> >> > > >
> >> > > >
> >> > > > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > > > line 514, in plot w =
> >> > > > float(self.sampleRaster(self.InRastW.currentText(), self.xCoord,
> >> > > > self.yCoord))/10 File
> >> > > >
> >> > > >
> >> > > > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > > > line 299, in sampleRaster return self.sampleRaster20(layer, x, y)
> >> > > > File
> >> > > >
> >> > > >
> >> > > > "/home/dassau/.qgis2/python/plugins/weibullanalyse/weibullanalysedialog.py",
> >> > > > line 284, in sampleRaster20 success, data =
> >> > > > layer.dataProvider().identify(QgsPoint(x,y))
> >> > > >
> >> > > > TypeError:
> >> > > > QgsRasterDataProvider.identify(QgsPoint, QgsRaster.IdentifyFormat,
> >> > > > QgsRectangle theExtent=QgsRectangle(), int theWidth=0, int
> >> > > > theHeight=0): not enough arguments
> >> > > >
> >> > > > I found at
> >> > > > http://hub.qgis.org/wiki/quantum-gis/API_changes_for_version_20
> >> > > > the section QgsRasterDataProvider which should fit. And the
> >> > > > Method, where I assume the error occurs should be this
> >> > > >
> >> > > > # get value at mouse position QGIS <= 1.8 (working for 1.8)
> >> > > > def sampleRaster18(self, layer, x, y):
> >> > > > success, data = layer.identify(QgsPoint(x,y))
> >> > > > for band, value in data.items():
> >> > > > return value
> >> > > >
> >> > > > now what I tried but doesn't work (see error above)
> >> > > >
> >> > > > # get value at mouse position QGIS >= 2.0 (not working yet :()
> >> > > > def sampleRaster20(self, layer, x, y):
> >> > > > success, data = layer.dataProvider().identify(QgsPoint(x,y))
> >> > > > for band, value in data.items():
> >> > > > return value
> >> > > >
> >> > > > my problem is, that I don't understand how to implement in
> >> > > > sampleRaster20 the new method from the API_changes_for_version_20
> >> > > > website which says:
> >> > > >
> >> > > > QMap<int, QVariant> identify( const QgsPoint & thePoint,
> >> > > > IdentifyFormat theFormat, const QgsRectangle &theExtent =
> >> > > > QgsRectangle(), int theWidth = 0, int theHeight = 0 )
> >> > > >
> >> > > > can anybody help?
> >> > > >
> >> > > > Thanks
> >> > > >
> >> > > > Otto
> >> > > > _______________________________________________
> >> > > > Qgis-developer mailing list
> >> > > > Qgis-developer at lists.osgeo.org
> >> > > > http://lists.osgeo.org/mailman/listinfo/qgis-developer
> >> > > >
> >> >
> >> >
> >> > --
> >> > Geoinformatik Büro Dassau - http://www.gbd-consult.de
> >> > FOSSGIS consulting , training , support and analysis
> >> > Ackerstrasse 144c , D - 40233 Düsseldorf , Germany
> >> > Tel: +49-(0)211-47468178 , Mobil: +49-(0)171-4687540
> >> >
> >> > --
> >> > Community Advisor - QGIS Project Steering Committee
> >
> >
> > --
> > Geoinformatik Büro Dassau - http://www.gbd-consult.de
> > FOSSGIS consulting , training , support and analysis
> > Ackerstrasse 144c , D - 40233 Düsseldorf , Germany
> > Tel: +49-(0)211-47468178 , Mobil: +49-(0)171-4687540
> >
> > --
> > Community Advisor - QGIS Project Steering Committee
--
Geoinformatik Büro Dassau - http://www.gbd-consult.de
FOSSGIS consulting , training , support and analysis
Ackerstrasse 144c , D - 40233 Düsseldorf , Germany
Tel: +49-(0)211-47468178 , Mobil: +49-(0)171-4687540
--
Community Advisor - QGIS Project Steering Committee
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