Re: [Qgis-developer] Question on inverted polygon renderer

[Régis Haubourg]

Hi, 
I finished the video demonstration of mask plugin use case. See 
https://www.youtube.com/watch?v=u29yGSQhX2g
  

Cheers
Régis



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Re: [Qgis-developer] Question on inverted polygon renderer

[Régis Haubourg]

I just released the mask plugin version 1.0 in qgis repository. I'll be glad
to have some feedback on it.

We still need to document it, what will be done in github dedicated wiki.

Documenting inverted polygon renderer should be done in qgis main doc. How
do we proceed to add sections in it? 

Cheers, 
Régis






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Re: [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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> View this message in context: 
> http://osgeo-org.1560.x6.nabble.com/Question-on-inverted-polygon-renderer-tp5146099p5146162.html
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Re: [Qgis-developer] Question on inverted polygon renderer

[Bernhard Ströbl]

Hi Hugo,

let me explain: I use mapcache to preproduce tiles of my background 
layers rendered by QGIS server. Thus sometimes labels get cut because 
they are rendered too close to the edge of the requested map.
I was attracted by Régis "Label features of layers only for objects 
intersecting the mask region" and was thinking if one could use that to 
address my problem, especially if it goes into core (needs to be for 
server I reckon). There won't be a dedicated mask layer, of course, but 
I imagined server creating the mask feature otf from the bbox parameter 
of the GetMap request (minus a distance set in OWS server tab).
If you integrate this into core and there might be a chance to use it as 
I described I would be happy if you integrated it in a way that would 
allow to enhance QGIS server to use it.


Bernhard

Am 17.06.2014 10:22, schrieb Hugo Mercier:

Hi,

Le 17/06/2014 09:32, Régis Haubourg a écrit :

Hi Bernard,
plugin is coming this week I think.


Yes, it is already available at https://github.com/Oslandia/mask_plugin
A 1.0 version for the official qgis repository is on its way.



Bernhard Ströbl wrote

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


current implementation adds a In_mask(srid) expression, that can be used
anywhere in style or labeling settings. If QGIs server fill current mask
geometry with a bbox, slightly smaller than true extent, you will avoid
drawing labels to close from the edges. I'm not sure this is the best design
option, it sounds more like a hack to me.
I will let Hugo explain detailed implementation.


Well, I don't know exactly what is the problem with the labeling part of
the server. This label filtering feature has not been designed for such
a use-case. The current implementation of "atlas with mask" relies on
signals that are catched within a plugin to update the mask layer.
We could imagine something similar for the server, but I agree that
would be a hack.

The problem you have might be somehow related to how qgis clips vectors
before rendering them, as Nyall pointed out
(http://hub.qgis.org/issues/9757)

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Re: [Qgis-developer] Question on inverted polygon renderer

[Hugo Mercier]

Hi,

Le 17/06/2014 09:32, Régis Haubourg a écrit :
> Hi Bernard, 
> plugin is coming this week I think.

Yes, it is already available at https://github.com/Oslandia/mask_plugin
A 1.0 version for the official qgis repository is on its way.

> 
> Bernhard Ströbl wrote
>> 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
> 
> current implementation adds a In_mask(srid) expression, that can be used
> anywhere in style or labeling settings. If QGIs server fill current mask
> geometry with a bbox, slightly smaller than true extent, you will avoid
> drawing labels to close from the edges. I'm not sure this is the best design
> option, it sounds more like a hack to me.
> I will let Hugo explain detailed implementation. 

Well, I don't know exactly what is the problem with the labeling part of
the server. This label filtering feature has not been designed for such
a use-case. The current implementation of "atlas with mask" relies on
signals that are catched within a plugin to update the mask layer.
We could imagine something similar for the server, but I agree that
would be a hack.

The problem you have might be somehow related to how qgis clips vectors
before rendering them, as Nyall pointed out
(http://hub.qgis.org/issues/9757)

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Re: [Qgis-developer] Question on inverted polygon renderer

[Mathieu Pellerin]

Here's a quick example of what the combination of inverted polygon and
shapeburst fill can do: http://i.imgur.com/7n6rxJx.jpg

Since shapeburst fill can use map-based units, the "outer glows"-like
effect of polygons can be spatially relevant, i.e. in the above map, the
glow could represent a specific distance, 2km, within which a growing
impact on local population is to be expected.

Math


On Tue, Jun 17, 2014 at 4:15 AM, Nyall Dawson 
wrote:

>
> On 17/06/2014 6:44 am, "Régis Haubourg" <
> regis.haubo...@eau-adour-garonne.fr> wrote:
> >
> > inverted style + shapeburst give crazy cool rendering!
>
> A quick tip if you're using shapeburst with inverted polygons - you must
> have the "shade to a set distance" option selected, and set a relatively
> small distance. Otherwise you'll see shading from the canvas edges (refs
> #10570, #9757).
>
> Mathieu Pellerin also has some nice examples of inverted shapeburst fills
> used to shade the exterior of polygons in a thematic map - i'm not sure if
> he's posted them on the flickr group yet.
>
> Nyall
>
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Re: [Qgis-developer] Question on inverted polygon renderer

[Régis Haubourg]

Hi Bernard, 
plugin is coming this week I think.

Bernhard Ströbl wrote
> 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

current implementation adds a In_mask(srid) expression, that can be used
anywhere in style or labeling settings. If QGIs server fill current mask
geometry with a bbox, slightly smaller than true extent, you will avoid
drawing labels to close from the edges. I'm not sure this is the best design
option, it sounds more like a hack to me.
I will let Hugo explain detailed implementation. 
Cheers
Régis



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Re: [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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Re: [Qgis-developer] Question on inverted polygon renderer

[Nyall Dawson]

On 17/06/2014 6:44 am, "Régis Haubourg" 
wrote:
>
> inverted style + shapeburst give crazy cool rendering!

A quick tip if you're using shapeburst with inverted polygons - you must
have the "shade to a set distance" option selected, and set a relatively
small distance. Otherwise you'll see shading from the canvas edges (refs
#10570, #9757).

Mathieu Pellerin also has some nice examples of inverted shapeburst fills
used to shade the exterior of polygons in a thematic map - i'm not sure if
he's posted them on the flickr group yet.

Nyall
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Re: [Qgis-developer] Question on inverted polygon renderer

[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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[Qgis-developer] Question on inverted polygon renderer

[Andreas Neumann]

Hi all,

I used the inverted polygon renderer for the first time. Cool!

Obviously this is very useful for the serial printing.

My question is: are there other use cases besides the serial printing
that the ones who ordered or developed this feature had in mind?

Perhaps, something in combination with more complex rules?

Just curiosity ...

Thanks,
Andreas
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