Transforming line into polygon with Geometry Generator

Question

I would like to turn my line into polygon in the symbology.

I found some hint here: https://anitagraser.com/2017/04/08/a-guide-to-geometry-generator-symbol-layers/ but I am not sure of the expression, which should be included.

I tried something like this, but the fill is not visible at all. I've got a line only.

How can I make fill for these enclosed lines?

Please provide the expression you use to create the polygon. If you don't have one, then there's your error. — Erik, Commented Aug 25, 2020 at 13:54

Taras · Accepted Answer · 2020-08-26 06:09:12Z

6

Let's assume there is a polyline layer "line", see image below.

Proceed with RMT > Symbology > Single Symbol > Line > Geometry Generator

Use the following code make_polygon($geometry) in the "Geometry Generator"-field and change the Geometry Type into 'Polygon/MultiPolygon'.

Additionally try convex_hull($geometry) that will produce a Convex hull.

Note: Mind the forms/shape/guise of your lines.

P.S.: I can suggest inspecting the geometry menu in the 'Expression Dialog', see image below

answered Aug 25, 2020 at 14:02

Taras♦

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Perfect! It was exactly what I was looking for!
– Geographos
Commented Aug 25, 2020 at 14:24
Which one did you use convex_hull() or make_polygon()?
– Taras ♦
Commented Aug 25, 2020 at 15:00
I used convex_hull()
– Geographos
Commented Aug 25, 2020 at 16:04
make_polygon is also fine, I've checked it
– Geographos
Commented Aug 25, 2020 at 16:25

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