I have QGIS 3.8.2 installed and started to look at the Geometry Generator. I have a layer of airline tracks and trying to create a curved line linking start and end points.
I did a lot of searching and found the followng code but when I apply this I get straight lines not curved lines like I have seen elsewhere.
make_line(
start_point($geometry),
centroid(
offset_curve(
$geometry,
length($geometry)/-5.0
)
),
end_point($geometry)
)
Hopefully its something simple that I am doing wrong.