[Qgis-developer] Question on inverted polygon renderer

[Bernhard Ströbl]

Hi Régis,

this sounds great (I have not tried, though), especially the inverted 
style stuff.
Thinking about QGIS server: Would there be a chance to use what you 
describe to keep labels staying away from the edge of the requested map?

Bernhard

Am 16.06.2014 22:43, 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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