[Qgis-developer] New API for labeling Engine?

[Tim Sutton]

Hi

> On 24 Sep 2015, at 15:12, Martin Dobias <wonder.sk at gmail.com> wrote:
> 
> Hi Regis
> 
> On Wed, Sep 23, 2015 at 4:19 AM, Régis Haubourg
> <regis.haubourg at eau-adour-garonne.fr> wrote:
>> Hi all,
>> I just saw a recent commit labeled "New API for labeling engine
>> (QgsLabelingEngineV2)" [0]
>> 
>> Can anyone tell us more on that work that seems very promising?
> 
> This was motivated by my work on rule-based labeling (landed just
> moments ago in master). The labeling engine has existed without major
> architectural changes for 5-6 years since its introduction. Since then
> lots of features were added and the original framework started to show
> its age. The new API should allow for much more flexibility... things
> like running labeling engine completely independently from the main
> rendering loop, using anything as a source of label features (e.g.
> raster cells?) and so on.

Labelling raster cells would be awesome!


> The old API (QgsPalLabeling) is of course
> still available (and acts as a wrapper of the new API), but should get
> removed in QGIS 3.
> 
> 
>> My question is not totally innocent, I just launch funding to start QEP's
>> work on labeling improvements. I would like that QGIS can handle several
>> features, but need to fund exploratory work before knowing how to do that
>> exactly:
>>  - add core ability to draw callouts between features and labels
>>  - add new label types, that wan be labeled on "paths", just like ESRI
>> annotations.
>>  - port to C++ features currently available in EasyCustomLabeling Plugins
>> and Mask plugin.
>>       - generate layers dedicated to manual labeling (addition of data
>> defined fields).
>>       - Allow to mask labels outside of an area of interest, and allow
>> Atlas to use it in batch use cases.
> 


> Nice list - let me know if you need help with any of those ;-)


Very nice to see labelling get some love! I could add my wish to your list:

* allow canvas border to be treated as a labelling impediment to prevent partial labels

Regards

Tim



> 
> Cheers
> Martin
> _______________________________________________
> Qgis-developer mailing list
> Qgis-developer at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-developer

—





Tim Sutton

Visit http://kartoza.com <http://kartoza.com/> to find out about open source:

* Desktop GIS programming services
* Geospatial web development
* GIS Training
* Consulting Services

Skype: timlinux Irc: timlinux on #qgis at freenode.net
Tim is a member of the QGIS Project Steering Committee

Kartoza is a merger between Linfiniti and Afrispatial

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20150924/b07ba306/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: KartozaLogo160x66.png
Type: image/png
Size: 9324 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20150924/b07ba306/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 455 bytes
Desc: Message signed with OpenPGP using GPGMail
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20150924/b07ba306/attachment-0001.pgp>