[Qgis-user] vector digitizing question

[Tudorache, Marian]

Hi Scott,

The new possibility in 2.18 is cool but if you have older QGIS version you can use SIGNAL/SLOTS

<your Layer>.featuresAdded().connect(defaultAttributes)

def defaultAttributes(fid):
feature = [feat for feat in <your Layer>.getFeatures() if feat.id() == fid][0]
<your Layer>.changeAttributeValue(fid, <index of the attribute>, feature.geometry().length())
<your Layer>.featuresAdded().disconnect()

It is a little bit messy :).

Marian

-----Original Message-----
From: Qgis-user [mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of Matthias Kuhn
Sent: November-09-17 9:47 AM
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] vector digitizing question

Hi Scott,

a tiny bit of configuration and it will be done for you:

https://gis.stackexchange.com/a/211154/9839

Regards
Matthias

On 11/09/2017 03:43 PM, Madry, Scott wrote:
> Hello all. I have a vector polygon shape file that was originally
> created in ArcGIS. I have recently added three polygons to the file
> using QGIS, but the results (attached) show that the area and
> perimeter values for these are not computed. How can I, in QGIS,
> generate these area and perimeter fields to be added? I know I can
> manually do the areas using the ‘Measure’ tool, but would prefer an automated process.
> Does Arc just create these automatically? Can QGIS?
>
> Thanks so much,
>
> Scott
>
> Scott Madry, Ph.D.
> Research Associate Professor of Archaeology The University of North
> Carolina at Chapel Hill
>
> Tel         1-919-448-4493
> Email:    madrys at email.unc.edu <mailto:madrys at email.unc.edu>
> https://scottmadry.web.unc.edu
> Skype:   scott.madry
>
>
>
>
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