[QGIS-Developer] Calculate area/perimtere/length of polygon/line while editing

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

Thanks. Plugin installed but will not run.  I get the error below.  I have QGIS 3.34.4.

TypeError: QgisInterface missing 'mActionDigitizeWithCurve' action
Traceback (most recent call last):
  File "C:\PROGRA~1/QGIS33~1.4/apps/qgis-ltr/./python\qgis\utils.py", line 423, in _startPlugin
    plugins[packageName] = package.classFactory(iface)
  File "C:\Users/RDTECLAC/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\calcarea2\__init__.py", line 29, in classFactory
    return CalcAreaPlugin( iface )
  File "C:\Users/RDTECLAC/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\calcarea2\plugin.py", line 66, in __init__
    self.toolEvent = CalcAreaEvent( self.iface )
  File "C:\Users/RDTECLAC/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\calcarea2\calcareaevent.py", line 478, in __init__
    self.addFeatureEvent = AddFeatureEvent( iface )
  File "C:\Users/RDTECLAC/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\calcarea2\calcareaevent.py", line 213, in __init__
    self.geomPolygon = self.GeomPolygon( iface )
  File "C:\Users/RDTECLAC/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\calcarea2\calcareaevent.py", line 316, in __init__
    self.actionDigitizeWithCurve = getActionDigitizeWithCurve( iface )
  File "C:\Users/RDTECLAC/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\calcarea2\calcareaevent.py", line 308, in getActionDigitizeWithCurve
    raise TypeError(f"QgisInterface missing '{name}' action")
TypeError: QgisInterface missing 'mActionDigitizeWithCurve' action

From: DelazJ <delazj at gmail.com>
Sent: Tuesday, March 11, 2025 11:08 AM
To: Catania, Luke A ERDC-RDE-GRL-VA CIV <Luke.A.Catania at erdc.dren.mil>
Cc: qgis-developer at lists.osgeo.org
Subject: Re: [QGIS-Developer] Calculate area/perimtere/length of polygon/line while editing

Hi,
There is a CalcArea2 plugin whose description mentions it should be doing that for polygons. You might want to take ispiration from their code.

Regards,
Harrissou

Le mar. 11 mars 2025 à 15:55, Catania, Luke A ERDC-RDE-GRL-VA CIV via QGIS-Developer <qgis-developer at lists.osgeo.org<mailto:qgis-developer at lists.osgeo.org>> a écrit :
I need to calculate these values on the fly while I am in an edit session resizing a polygon or a line.  I need the user to see this calculation while they are editing not after the edits are committed. I already have the UI set up to capture after commit, but I need to capture while they are moving vertices and update the values in the UI, so they don’t keep editing and then committing just to see if they are close.  I want them to know before they commit.

Any idea how to achieve this?

Luke Catania
US Army ERDC-GRL
JCMS Site Planning Developer

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