Am 15.09.2019 um 22:23 schrieb Michael Koch:

> Hi,
>
> does anybody have a working example how to add a user-defined horizon
> line to the horizon.dat file?
>
> I did try this code for a 90-degree segment of my horizon:
>
> f 12 32 32 0
> 0   25
> 10  21
> 20  20
> 30  16
> 40  22
> 50  18
> 60  16
> 70  22
> 80  19
> 90  16
> 90 -10
> 0  -10
>
> The problem is that sometimes Guide fills the area correctly, and
> sometimes it fills the whole screen and sometimes it fills everything
> else except the area to be filled. It depends on which point is
> centered in the screen.
>

This segment is from north to east. The problem becomes visible when you
center a point in the opposite direction, at the southwest horizon. Then
the whole screen is filled.

Michael