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List: qgis-developer
Subject: Re: [Qgis-developer] Problem definig snapping options programmatically
From: John Stevenson <john.stevenson () thinkwhere ! com>
Date: 2016-06-24 11:06:50
Message-ID: 9BEAE41C5F3C764E84B78481B4AC2D7EB746A5 () STGV-BUS01 ! thinkwhere ! local
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Hi Christian,
Yes, my problem is exactly the same as yours, and so I have the same questions, too:
- is it a bug or a feature that the settings are not applied immediately by \
setSnapSettingsToLayer()?
- is there a way to change snapping settings to Advanced via Python?
Thanks,
John
John Stevenson
Senior Developer
Email:mailto:john.stevenson@thinkwhere.com
Glendevon House
Castle Business Park
Stirling FK9 4TZ
Tel: 01786 476060
Tel: 01786 476093 (Direct Dial)
________________________________________
From: Qgis-developer [qgis-developer-bounces@lists.osgeo.org] on behalf of EFTAS \
Christian Röttger [Christian.Roettger@eftas.com]
Sent: 24 June 2016 10:38
To: qgis-developer@lists.osgeo.org
Subject: Re: [Qgis-developer] Problem definig snapping options programmatically
Hi John,
sorry I think I don't understand your mail at the moment. As I understand it, this is \
exactly my problem or is here a solution in it? I tried \
QgsProject.instance().snapSettingsChanged.emit() but it seems that it has no effect \
and like below fires with no argument. Settings are set but are not applied.
The only "solution" which I see at the moment is:
"Settings > Snapping Options > Snapping Mode" remains at "Current Layer". Changing \
this to to "Advanced" shows correct values have been set, but they are not activated \
until "OK" is pressed.
Thanks for the help
Christian
> -----Ursprüngliche Nachricht-----
> Von: Qgis-developer [mailto:qgis-developer-bounces@lists.osgeo.org] Im
> Auftrag von John Stevenson
> Gesendet: Freitag, 24. Juni 2016 10:43
> An: Matthias Kuhn; qgis-developer@lists.osgeo.org
> Cc: Tom Chadwin
> Betreff: Re: [Qgis-developer] Problem definig snapping options
> programmatically
>
> Hi all,
>
> This is the same issue that I had a few months ago [1]. (Thanks Tom
> for flagging it up).
>
> You can recreate in the console as follows as follows (QGIS 2.14.3,
> with one vector layer loaded):
>
> ```
> vlayer = QgsMapLayerRegistry.instance().mapLayers().values()[0]
> proj = QgsProject.instance()
> proj.setSnapSettingsForLayer(vlayer.id(), True,
> QgsSnapper.SnapToVertex, QgsTolerance.LayerUnits, 5.0, False)
> ```
>
> The settings are not applied.
>
> "Settings > Snapping Options > Snapping Mode" remains at "Current
> Layer". Changing this to to "Advanced" shows correct values have been
> set, but they are not activated until "Apply" is pressed.
>
> Connecting a function to QgsProject.instance().snapSettingsChanged()
> shows that the signal fires with no arguments when
> setSnapSettingsForLayer is called. Emitting the signal manually does
> nothing.
>
> Cheers
> John
>
> [1]: http://osgeo-org.1560.x6.nabble.com/Setting-snapping-settings-via-
> Python-td5246362.html
>
> John Stevenson
> Senior Developer
> Email:mailto:john.stevenson@thinkwhere.com
>
> Glendevon House
> Castle Business Park
> Stirling FK9 4TZ
>
> Tel: 01786 476060
> Tel: 01786 476093 (Direct Dial)
>
> ________________________________________
> From: Qgis-developer [qgis-developer-bounces@lists.osgeo.org] on behalf
> of Matthias Kuhn [matthias@opengis.ch]
> Sent: 23 June 2016 14:55
> To: qgis-developer@lists.osgeo.org
> Subject: Re: [Qgis-developer] Problem definig snapping options
> programmatically
>
> Hi Christian,
>
> Does it help if you call
>
> QgsProject.instance().snapSettingsChanged()
>
> Cheers
> Matthias
>
> On 06/23/2016 03:38 PM, EFTAS Christian Röttger wrote:
> > Hi developers,
> >
> >
> >
> > i'm facing a problem which i do not understand. In our plugin I
> created
> > a function to set snapping options and bound it to a shortcut.
> >
> > Using Qgis 2.14.3, source code see below.
> >
> >
> >
> > The assigned shortcut works well, but for the snapping I have to do
> the
> > following on every QGIS start:
> >
> > Go to snapping options, mode = advanced, press ok (without changing
> > anything). Then it works afterwards!
> >
> > But when I print the options *before* I do this, I definitely get the
> > right options (see below).
> >
> >
> >
> > Does anyone know what I'm missing? Should I open an bug report? Is
> there
> > a workaround do do: "Go to snapping options, mode = advanced, press
> ok"
> > programmatically ?
> >
> >
> >
> > Thanks for any help
> >
> > Christian
> >
> >
> >
> > ## Print result
> >
> > Initialize, when aggroInstance is true
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > checked
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, True, 2, 0, 2.0, False)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, True, 2, 0, 2.0, False)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> > (True, False, 2, 0, 2.0, True)
> >
> >
> >
> > ## function
> >
> >
> >
> > *def *toggleSnapping(checked):
> > /'''
> > Toggle snapping option
> > /*:param*/checked: True if snapping has been activated, False
> otherwise
> > '''
> > /aggroInstance = initModule.aggroInstance
> > *print **'Initialize'
> > **if *bool(agroInstance):
> > *for *item *in
> *QgsMapLayerRegistry.instance().mapLayers().values():
> > QgsProject.instance().setSnapSettingsForLayer(item.id(),
> > False, 2, 0, 2, True)
> > fieldLayer =
> > mapUtils.getLayerByName(aggroInstance.dictData[*'field'*])
> > backgroundLayer = mapUtils.getLayerByName(*'bg'*)
> > *for *item *in
> *QgsMapLayerRegistry.instance().mapLayers().values():
> > *print
> *QgsProject.instance().snapSettingsForLayer(item.id())
> > *if *checked:
> > *print **'checked'
> > */# Convenience function to set snap settings per layer.
> > # it defines the snapping options:
> > # id : the id of your layer, True : to enable the layer
> > snapping, 2 : options (2: vertex+segment), 0: type of unit on map, 2
> >
> > tolerance, true : avoidIntersection)
> >
> > /QgsProject.instance().setSnapSettingsForLayer(fieldLayer.id(), True,
> 2,
> > 0, 2, False)
> >
> > QgsProject.instance().setSnapSettingsForLayer(backgroundLayer.id(),
> > True, 2, 0, 2, False)
> > *for *item *in
> > *QgsMapLayerRegistry.instance().mapLayers().values():
> > *print
> > *QgsProject.instance().snapSettingsForLayer(item.id())
> >
> >
> >
> > ## initialization in run() method
> >
> >
> >
> > /# Call Snapping Tool by a key shortcut
> > /*for *action *in *self.actions:
> > *if *action.text() == *'Toggle Snapping'*:
> > /# Action triggered by shortcut key
> > /self.iface.registerMainWindowAction(action, *"c"*)
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > --
> >
> > image003
> >
> > eftas3
> >
> > Dipl.-Geoinf. Christian Röttger
> >
> > -Forschung und Entwicklung
> >
> > E F T A S Fernerkundung
> > Technologietransfer GmbH
> > Oststraße 2-18
> > 48145 Münster
> >
> > Fon: +49 251 13307-23 E-Mail: christian.roettger@eftas.com
> > <mailto:christian.roettger@eftas.com>
> > Fax: +49 251 13307-33 Web: http://www.eftas.com
> > <http://www.eftas.com/>
> >
> > Geschäftsführer:
> > Dipl.-Ing. Georg Altrogge
> >
> > Sitz der Gesellschaft: Münster
> > Amtsgericht Münster, HRB 2999
> > USt.-IdNr. DE 126038986
> >
> > ******************************************************************
> >
> > image007
> >
> >
> >
> >
> >
> > _______________________________________________
> > Qgis-developer mailing list
> > Qgis-developer@lists.osgeo.org
> > List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer
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