[Qgis-user] problems with 'geometry creator'

[Matthias Kuhn]

Hi Tobias,

If I read this correctly, you have got 5 features, each with a
LineString and what you would like to have is 1 feature with a connected
line.

Geometry generators work on individual features (5 features in, 5
features out).

What you will need instead is something with support for aggregation
like either a virtual layer or it might be possible to use aggregate
expression function with "collect".

Matthias

On 6/11/17 2:01 AM, Tobias Wendorff wrote:
> Hi there!
>
> I'm experiencing problems using "geometry generator". Perhaps I don't
> understand this tool correctly or perhaps I'm using it wrong. Could
> anyone please help a look?
>
> I've created five linestrings, which are connected to each other
> (CRS is EPSG:25832):
>
> LineString (452926.429 5430258.436, 474353.217 5556034.254)
> LineString (474353.217 5556034.254, 651518.643 5480403.768)
> LineString (651518.643 5480403.768, 768696.380 5642150.590)
> LineString (768696.380 5642150.590, 716125.982 5713907.693)
> LineString (716125.982 5713907.693, 797502.108 5831380.483)
>
> I'm using single layer type "Geometry creator" and have set the type
> to LineString/MultiLineString. Then I've tried these functions:
>
> "line_merge( $geometry )" or "segments_to_lines( $geometry )"
>
> Then I've used the bundled style "Road" on the created geometry.
> But this is what's displayed: http://i.imgur.com/NwbIHjg.png
> Actually, I thought, I would get a connected line, like using
> "Symbol layers".
>
> Can anyone help me with this? Am I doing it wrong?
> I'm using QGIS v2.18.9.
>
> Best regards,
> Tobias
>
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