[QGIS-Developer] Rotating selected features programmatically

[Catania, Luke A ERDC-RDE-GRL-VA CIV]

Well.  Now for some reason my select by expression tool is not selecting any features, so need to figure out why that is happening before implementing this change. I did not make any changes that I can see that would have caused this.

From: Jacky Volpes <jacky.volpes at oslandia.com>
Sent: Monday, August 5, 2024 5:14 AM
To: Catania, Luke A ERDC-RDE-GRL-VA CIV <Luke.A.Catania at erdc.dren.mil>; 'qgis-developer' <qgis-developer at lists.osgeo.org>
Subject: Re: [QGIS-Developer] Rotating selected features programmatically

Hi Luke,

My guess is that when more than one feature is selected, and the rotation is ended, geometryChanged signal is emitted for each rotated feature.

element_layer_rotated() is run when the first geometryChanged signal is emitted, and is disconnected, and the layer is saved, and the other geometryChanged signals don't trigger anything.

NB: self.vector_layer.editBuffer().geometryChanged.disconnect()       is risky, if other slots are connected, prefer      self.vector_layer.editBuffer().geometryChanged.disconnect(self.element_layer_rotated)

Regards,


--

Jacky Volpes



Ingénieur développeur SIG - Oslandia
Le 01/08/2024 à 20:29, Catania, Luke A ERDC-RDE-GRL-VA CIV a écrit :
def rotateFeature(self):
        """Find the rotate feature action in QGIS toolbar and trigger it so the user can rotate the element.
        """

        # We want to detect when the rotation is complete with a geometryChanged signal so we can commit the changes and
        # end the edit session.
        self.vector_layer.editBuffer().geometryChanged.connect(self.element_layer_rotated)

        # Get all actions so we can search for the mActionRotateFeature action.
        actions = iface.mainWindow().findChildren(QAction)
        action = [x for x in actions if x.objectName()=='mActionRotateFeature'][0]

        expression = '"Element_Nb" = '
        expression = expression + "\'" + f'{self.element_number}' + "\'"
        QgsMessageLog.logMessage(f"expression: {expression}", "StandoffLayers", Qgis.Info)

        processing.run("qgis:selectbyexpression",
                       {'INPUT':self.vector_layer,
                        'EXPRESSION': expression,
                        'METHOD':0
                        }
        )
        # Inititates rotate feature action allowing to select a snap to value.
        action.trigger()

        QgsMessageLog.logMessage(f"Rotate Feature Action Triggered", "ElementPlacementTool", Qgis.Info)

def element_layer_rotated(self):
        """When the rotate action is triggered it seems to ignore the ElementPlacementTool events, so in order to end the edit session
        we need to detect a geometryChanged event after the rotation is complete.
        """
        QgsMessageLog.logMessage(f"Element Layer Rotated: {self.vector_layer.name()}", "ElementPlacementTool", Qgis.Info)

        # Disconnect from the signal so we can just commit the changes.
        self.vector_layer.editBuffer().geometryChanged.disconnect()

        # Save changes and end edit mode
        self.vector_layer.commitChanges()
        self.vector_layer.endEditCommand()
        self.deactivate()

From: Jacky Volpes <jacky.volpes at oslandia.com><mailto:jacky.volpes at oslandia.com>
Sent: Thursday, August 1, 2024 8:26 AM
To: Catania, Luke A ERDC-RDE-GRL-VA CIV <Luke.A.Catania at erdc.dren.mil><mailto:Luke.A.Catania at erdc.dren.mil>; 'qgis-developer' <qgis-developer at lists.osgeo.org><mailto:qgis-developer at lists.osgeo.org>
Subject: Re: [QGIS-Developer] Rotating selected features programmatically

Hi Luke,

Please provide a PyQGIS code snippet to reproduce. It will be more convenient to comment and suggest modifications.
Thanks,



--

Jacky Volpes



Ingénieur développeur SIG - Oslandia

Le 26/07/2024 à 22:06, Catania, Luke A ERDC-RDE-GRL-VA CIV via QGIS-Developer a écrit :
I am using the select by expression tool through python to select my features and then I trigger rotation through python I see both selected features rotating, but when I click to end the rotation, it only rotated one of the features and left the other one as is.  If I do this through the QGIS using the selection by expression in the selection toolbar and the rotate in the advanced digitizing tool bar rotating both features works fine.

Any Ideas?

Luke




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