Okay, getting a line where the staff lines appear to change color
partway through the line is possible, but takes some substantial manual
work. All the work below assumes that you are using v4.0.0-beta or
later. It should be possible with v3.0.3 as well, but you'll need to
change the command names to the old names.
To accomplish this you'll need a separate score for each section of the
score where the lines are to change color. In the case of your example,
that's three scores:
score1.gabc:
<c>V.</c> Il(e) Sig(f)no(g)re(g) si(e)a(e) con(f) vo(g)i.(f) (::)
score2.gabc:
<c>R.</c> E(e) con(f) il(g) tu(e)o(f) spi(g)ri(f)to.(f)
score3.gabc:
<c>V.</c>(::) In(g) al(h)to(g)
Of course, each score file will need it's proper header. In particular,
you'll want to make sure that initial-style is 0 for score2 and score3
(your example would have it be 0 for score1 too, but that isn't strictly
necessary).
Also, if the music is to continue beyond the end of the line, you will
need a new score to start the next line.
Next, each score needs to be included inside a minipage environment of
the appropriate size (note in the example below I've picked arbitrary
numbers, you'll have to adjust accordingly):
\noindent%
\begin{minipage}[t]{2in}%
\gregorioscore{score1}%
\end{minipage}%
\begin{minipage}[t]{2in}%
\gresetlinecolor{gregoriocolor}%
\gresetclef{invisible}%
\gregorioscore{score2}%
\end{minipage}%
\begin{minipage}[t]{1in}%
\gresetclef{invisible}%
\gregorioscore{score3}%
\end{minipage}%
Note that each line ends with a % character. This ensures that TeX
doesn't put any space between the scores.
Also note that you must supress the cleff (`\gresetclef{invisible}`) on
each and every score except the first. Further it is not necessary to
change the line color back to black for the third score. This is
because the minipage environment, as an environment, is a group and so
settings will automatically revert to their previous values at the end
of the environment. You could change these settings outside the
minipage environments, in which case they would be inherited by the
environment, but I think the document is clearer like this.
Note, since you must use very short lines, you could also do this with
`\gabcsnippet` instead of `\gregorioscore`:
\noindent%
\begin{minipage}[t]{2in}%
\gabcsnippet[0]{<c>V.</c> Il(e) Sig(f)no(g)re(g) si(e)a(e) con(f)
vo(g)i.(f) (::)}%
\end{minipage}%
\begin{minipage}[t]{2in}%
\gresetlinecolor{gregoriocolor}%
\gresetclef{invisible}%
\gabcsnippet[0]{<c>R.</c> E(e) con(f) il(g) tu(e)o(f)
spi(g)ri(f)to.(f)}%
\end{minipage}%
\begin{minipage}[t]{1in}%
\gresetclef{invisible}%
\gabcsnippet[0]{<c>V.</c>(::) In(g) al(h)to(g)}%
\end{minipage}%
Finally, a word of warning: aligning the minipages just right can be
frustrating. For instance, if I remove the `[t]` from the above
examples, the last box will be positioned slightly lower than the first
two because none of the lyrics in it have a descender (a letter which
goes below the baseline like "g" or "p") while the first two do. Notes
above or below the staff in one of the snippets but not the others would
create similar problems. Depending on your real world needs you may
need to align the minipages on the top, bottom, or center or even
manually raise and lower them by placing them inside a `\raisebox`. In
any case, you can't skip the minipage environment because GregorioTeX
takes it's score width from `\hsize` and only the minipage environment
actually changes this parameter for its contents. The other box
commands will let the score see the document `\hsize`, which will be the
full width of the line, not the size of the box.
✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝
Br. Samuel, OSB
(R. Padraic Springuel)
PAX ☧ ΧΡΙΣΤΟΣ
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