Atlas current feature filter

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Author Name: David McDermott (David McDermott)
Original Redmine Issue: 8766

Redmine category:map_composer/printing

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Good morning to the QGIS community,

First off, thank you for QGIS 2.0.1, its a great piece of software and the GUI is fantastic. I have been looking forward to the atlas integration for a long time but I don't think it's quite there yet. When I print map books, I often have features close together. What I would like Atlas to do is apply a filter so that only the current feature is visible (or all features expect the current is visible). What I envisage is a feature similar to ESRIs data driven pages, page definition queries (http://tinyurl.com/p5ptq28).

I posted this request in the User Forum (http://tinyurl.com/puvazlh) but Vincent Picavet suggested I post it here. I'm not sure if this is already possible. I have tried several iteration in the feature filter dialog such as $feature=$feature or $rownum=$rownum with no success. The expression $feature=$currentfeature (if there was a $currentfeature) might work. On a layer by layer basis, a tick box in the layer filter option called "atlas filtering" might also be an option.

Thanks,

David

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• output_1.jpg (Nathan Woodrow)
• atlas_exp.png (David McDermott)
• atlas_on.png (David McDermott)
• qgis_version.png (David McDermott)

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Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was configured as Future Release - Nice to have
• category_id was configured as Map Composer/Printing

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Author Name: Anónimo (Anónimo)

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Fixed in changeset "bff6fe5913f2666b5d90cea47ae062b429604a22".

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• status_id was changed from Open to Closed

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Author Name: Nathan Woodrow (@NathanW2)

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Now that we have $currentfeature we can match that in a rule to highlight the active Atlas feature.

Result:

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• 6446 was configured as output_1.jpg
• resolution was changed from to fixed/implemented

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• output_1.jpg (Nathan Woodrow)

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Author Name: Regis Haubourg (@haubourg)

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Hi, I was about to ask the same feature! So great.. The idea was to be able to filter labeling only in currentfeature with a intersect clause.
Having another feature simplified on the current scale (with new simplification improvement by A.Huarte and V.Mora) would avoid performances issues with big polygons.. My two cents.
Régis

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Author Name: Nathan Woodrow (@NathanW2)

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Regis,

You could do this in using a CASE in a label expression (for now)

@case
WHEN $id = $currentfeature THEN "yourlabel"
END@

You could even use a case statement in the transparency property to get something like this.

@case
WHEN $id != $currentfeature THEN 50
END@

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Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)

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kudos Nathan, that's very useful

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Author Name: Regis Haubourg (@haubourg)

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Nathan Woodrow wrote:

Regis,

You could do this in using a CASE in a label expression (for now)

@case
WHEN $id = $currentfeature THEN "yourlabel"
END@

Hi Nathan,
that works only for Atlas coverage layer right ?

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Author Name: David McDermott (David McDermott)

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Thank you Nathan, this is perfect. How do I go about implementing this fix? I downloaded and installed the most recent (10/11/13) version of QGIS but there is no $Currentfeature function.

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Author Name: Nathan Woodrow (@NathanW2)

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Have you enabled Atlas in the composer. It will only be active then.

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Author Name: David McDermott (David McDermott)

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Atlas composer is active, and I have the $feature function. I took your idea and put ($feature + 1) = $id in the style expression and it works. I have added a few photos.

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• 6454 was configured as atlas_on.png
• 6453 was configured as atlas_exp.png

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• atlas_on.png (David McDermott)
• atlas_exp.png (David McDermott)

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Author Name: Nathan Woodrow (@NathanW2)

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I wouldn't use $feature + 1 because $feature is just a count and $id is not ordered or can having missing numbers so this expression will fail.

Can you QGIS Code revision you have in your About dialog.

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Author Name: David McDermott (David McDermott)

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My $feature+1 $id was just a temporary workaround that worked on this dataset. The code version is ebebdf3. Here is a screen shot

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• 6455 was configured as qgis_version.png

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• qgis_version.png (David McDermott)

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Author Name: Nathan Woodrow (@NathanW2)

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Oh your still running 2.0. You will have to grab a nightly build if you want this feature. You can get the nighly dev version using the OSGeo4W installers at http://qgis.org/en/site/forusers/download.html

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Author Name: Regis Haubourg (@haubourg)

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Hi Nathan,
I can't see $currentfeature variable in latest revision on OSGEO4W (5f5cd4c) , with Atlas enabled..
Any idea? OSGEO4W is late?

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Author Name: Nathan Woodrow (@NathanW2)

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Very old. Are you using the OSGeo4W of the qgis site?

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Author Name: Regis Haubourg (@haubourg)

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Yep, updated osgeo4w 64 bit today. Will check 32 bit now...

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Author Name: Regis Haubourg (@haubourg)

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Hum, in fact 32 bit package is realy old, 64 bit is up to 2.1.0-60

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Author Name: Jürgen Fischer (@jef-n)

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regis Haubourg wrote:

Hum, in fact 32 bit package is realy old, 64 bit is up to 2.1.0-60

What do you mean? The packages both are from today.

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Author Name: Regis Haubourg (@haubourg)

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In my 32 bit osgeo4w installer, I get 2.1.0-55 where I get -60 in 64 bits version.

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Author Name: Jürgen Fischer (@jef-n)

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regis Haubourg wrote:

In my 32 bit osgeo4w installer, I get 2.1.0-55 where I get -60 in 64 bits version.

Right, but that doesn't mean they contain different QGIS versions. Just that the 32bit version wasn't built successfully as many many times as the 64bit version.

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Author Name: Regis Haubourg (@haubourg)

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Ok, didn't know that. Anyway, it seems nathan's code is not functionnal in 32 bit package. Maybe other reasons explain that.

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Author Name: Nathan Woodrow (@NathanW2)

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Can you paste a image of your about QGIS dialog.

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Author Name: Regis Haubourg (@haubourg)

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here is what I see:

Version de QGIS 2.0.1-Dufour Révision du code ebebdf3
Compilé avec Qt 4.7.1 Utilisant Qt 4.7.1
Compilé avec GDAL/OGR 1.10.1 Utilisé avec GDAL/OGR 1.10.1
Compiled against GEOS 3.3.8-CAPI-1.7.8 Running against GEOS 3.4.2-CAPI-1.8.2 r3921
Version du client PostgreSQL 8.3.10 Version de SpatiaLite 4.1.1
Version de QWT 5.2.1 Version de PROJ.4 : 480
Version de QScintilla2 2.6.2