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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