[Qgis-developer] Question on inverted polygon renderer

[Andreas Neumann]

Hi Régis,

Thank you for the explanations and for funding it!

I think it is very cool, but as it is an "unusual" feature it probably
needs a bit of explaining in the manual. Esp. if you combine it with the
ShapeBurst fill.

People need to understand that they are styling anything but the current
/ selected feature.

Anyway - it is a powerful addition to QGIS.

Andreas

Am 16.06.2014 20:43, schrieb Régis Haubourg:
> Hi Andreas, 
> I'm the funder, Hugo Mercier from Oslandia is the developper. It's the right
> time to do some teasing I guess ;-).
> 
>  The inverted polygon renderer idea appeared when writing specifications for
> an improved mask tool . We will soon release new version of mask plugin that
> allows the following:
> 
> - generate a ROI layer from current polygon selection, or from another
> plugin's call.
> 
> - Label features of layers only for objects intersecting the mask region
> (several spatial operators inside). Users wish that a lot to do professional
> mapping. Unwanted side effect is that labeling is a lot more readable by
> giving more affordable space to labeling engine. 
> 
> - Automagically reuse current mask style to generate a mask on the fly on
> Atlas coverage feature. 
> 
> inverted style + shapeburst give crazy cool rendering!
> Another positive point, instead of making a big bbox with a hole, as current
> mask plugin does, an inverted style allowed a much cleaner solution, and
> sounded a lot more reusable.  And now, it's much more clear for the user to
> be able to zoom to the layer extent and not be zoomed out far away.
> 
> We were unsure about real performances of such spatial filtering, so we
> decided to start with a plugin, and share with you..  And, we found that
> filtering labels gives less work to pal engine, so the spatial intersection
> seems to be less consuming than labeling, for average layers. 
> 
> Many thanks to Oslandia Team and Hugo for the hard work. We're about to
> release the plugin, Hugo will launch a thread about this, and maybe a port
> to core, if you like it.  
> 
> I already see what we could do next, like label features only on the parts
> really intersecting that ROI.. 
> 
> Stay tuned! 
> Régis
> 
> 
> 
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