Re: Test direction within event-function

[David Kastrup]

Urs Liska <address@hidden> writes:

> Hi,
>
> I'm trying to write an event-function that creates both a slur and a
> markup on opposite sides. I can do that by manually specifying the
> directions:
>
> \version "2.19.82"
>
> testDirection =
> #(define-event-function ()()
>    #{
>      _(
>      ^"Text"
>    #})
>
> {
>   c' \testDirection d' )
> }
>
> but I have to make it possible to do it both ways (top/bottom and
> bottom/top).
> I know how to set the directions with an extra (optional) function
> argument, but I would prefer if I could extract the direction directly
> from within the event-function.

You can't.  It is set after calling the event-function.  You can use
tweaks/callbacks for the respective grob functions (most likely
"direction") where you use event-cause to get the originating event, get
the event direction from there and either use or invert it.

Am badly available for a few days.  Sister's wedding.

-- 
David Kastrup