Hello Simon!
Am 01.08.2011 schrieb Simon Dreher:
I get a strange behavior of the lyrics placement when I adjust the
vertical position at a new line:
The hyphens or melisma at the end of the old line already gets shifted
as if it were on the new line after the vertical shift. You can see this
in the example below at the end of the 4th and 5th system. How can I
correct this strange behavior?
This is due to a quite fundamental difficulty concerning the
synchronization of lyrics layout changes at system breaks. Recently,
Hermann Hinsch had similar problems with the same cause.
In every such case, this is the situation: You want to change the lyrics
layout at the beginning of a new system. You thus place the respective
command (e.g., \setsongraise) _after_ the last note of the pending
system but _before_ the system break command (normally \alaligne). This
seems correct only at the first glance; instead, musixlyr has to act on
the lyrics of the pending system even _after_ the final note is
processed. More precisely, it adds trailing hyphen sequences and lyrics
extension underlines, and it does so during the processing of the
\alaligne command. If the \setsongraise-or-whatever has occurred already
before \alaligne, the hyphens or underlines appear at the new vertical
position that is meant only for the next system.
Using plain MusiXTeX, the proper solution is easy: Wrap the lyrics
layout change in \def\atnextline{...}--that way, the change is made
effective at exactly the right processing stage.
But what to do using M-Tx? Since vertical lyrics shifting is a built-in
language element, you can't influence its function directly. From my
point of view, M-Tx itself should use \atnextline here (but that would
be more complicated since such vertical shifting could also occur in the
middle of a system; a distinction would thus be necessary). For you
as the M-Tx user, the only workaround I can think of is: Instead of
M-Tx's lyrics shifting command @+x, use PMX inline-TeX commands
properly. For example, change your M-Tx input line
@-2 a4 } a a a |
to:
\\\def\atnextline{\mtxLyricsAdjust{1}{-9}}\ a4 } a a a |
(This works for me, at least.) \mtxLyricsAdjust{1}{-9} is
literally what M-Tx outputs for @-2, so it should do the right thing;
putting it into \atnextline makes it perform at the right moment.
However, you do have to pay attention to the shifting amount. M-Tx's '@'
command uses relative numbers and translates them to absolute
positioning numbers for \mtxLyricsAdjust. In the example case, the
absolute position was -7 before the change, and the relative change by
-2 turns it into -9. Later in your input file, when shifting back by
@+2, you have to specify absolute position -7 again.
Hope that works,
Rainer
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