Not sure about all the implications, but actually you don't want to flip
the BEAM but the STEM. So \override Stem.direction = -1 will do what you
want.
Am 13.07.2016 um 16:19 schrieb Andrew Bernard:
> Hello all,
>
> While writing my right hand side slash function for beams, when
> modifying the beam stencil to add a slash on the right I need to
> determine if the beam is up or down (on top or below the notes) and
> the beam slope, for my geometry calculations to work. I had thought
> that the ‘direction’ property of a Beam indicates whether it is up or
> down, but on careful examination I appear to be getting values I
> cannot understand. My minimal working example to debug this works
> perfectly, but my scheme code seems to produce unpredictable (to me)
> results. So the first question I have is: what is Beam.direction, in
> point of fact? I I set Beam.direction to 1, -1, or 0 with an override
> beams move an amount that I cannot understand but the beam stays on
> top or on the bottom.
>
> The IR says:
>
> direction (direction):
> ly:beam::calc-direction
> If side-axis is 0 (or X), then this property determines whether the
> object is placed LEFT, CENTER or RIGHT with respect to the other
> object. Otherwise, it determines whether the object is placed UP,
> CENTER or DOWN. Numerical values may also be used: UP=1, DOWN=-1,
> LEFT=-1, RIGHT=1, CENTER=0.
>
> But what does this really mean for beams? Using \override
> Beam.direction = 1 or -1 or 0 produces an error:
>
> \version "2.19.45"
>
> {
> c''8[ e'' g'' c'']
>
> \override Beam.direction = -1
> c''8[ e'' g'' c'']
>
> }
>
> …
> Parsing...
> Interpreting music...
> Preprocessing graphical objects...
> programming error: Grob direction requested while calculation in progress.
> continuing, cross fingers
> programming error: Grob direction requested while calculation in progress.
> continuing, cross fingers
> programming error: Grob direction requested while calculation in progress.
> continuing, cross fingers
> programming error: Grob direction requested while calculation in progress.
> continuing, cross fingers
> Finding the ideal number of pages...
> Fitting music on 1 page...
> Drawing systems...
> Layout output to `/tmp/lilypond-rOxJao'…
> …
>
>
>
> Andrew
>
>
>
>
>
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