[Qgis-developer] Re : Show area of a polygon while editing with node tool

[Bernhard Ströbl]

Hi,

just a question: are you trying to superimpose this on top of the 
out-of-the-box node tool or are you planning on creating a new tool that 
copies the node tool?

The first is not so simple I assume, the second either (plus it does not 
make too much sense to rewrite core functionality in Python). Apart from 
that I would be sceptical because with mouse moves the users will never 
achieve their target area.

I see two possible solutions apart from making a plugin of your own:
1) label the polygon with its area; after a node is moved the label is 
updated so users can approximate their desired target area.
2) try DigitizingTools plugin; there is a function to move a node or a 
polygon side to achieve a target area. If you need other funtionality 
there you are invited to contribute.

Bernhard

Am 16.10.2014 12:56, schrieb Junior:
> Hi
> Isn't there already such plugin? I haven't used it yet but you can give
> a look to CalcArea plugin and see how it deals with that.
>
> Envoyé depuis mon HTC
>
> ----- Reply message -----
> De : "Michael Pfeiffer" <Michael.Pfeiffer at bd.so.ch>
> Pour : <qgis-developer at lists.osgeo.org>
> Objet : [Qgis-developer] Show area of a polygon while editing with node tool
> Date : jeu., oct. 16, 2014 09:38
>
> Hi everybody,
>
> I'm developing a python plugin.
> Now the users of the plugin want to see the area of a polygon while editing
> it with the node tool because they need to have polygons with a specific
> area.
> Means they move a node and the area changes while moving the node.
> Is there an easy way to manage this? Are there already any examples?
>
> Thx for your help
>
> regards
>
> Michael
>
>




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