Re: maximumFretStretch in Manual, tablatures section ?

[Thomas Morley]

2018-01-25 19:52 GMT+01:00 Éric <address@hidden>:
> Hello,
>
> in this exemple, the 1rst chord is the default calculation of tablature but
> not what I want.
> The 2nd chord get an error message even your intuition do not…
> The 3rd chord showing what I want.
>
> \version "2.19.60"
>
> \score {
>   \new TabStaff
>   { <c' bes'> <c'\2 bes'> <c'\2 bes'\1> }
> }
>
>
> The maximumFretStretch is set to 4 by default in translation.init.scm
> Lilypond files, while this chord is a 5 stretched.

Read
(ly:context-property context 'maximumFretStretch 4)
as: use the value 4, if maximumFretStretch is not otherwise specified.

> (yes, it can happen, specialy in highter notes position, where frets are
> less large, or if you play a small instrument)
>
> Looking to the manuel, the property maximumFretStretch is only belonging to
> Fretboards context.

Not really.
In the IR you'll find that maximumFretStretch is read by the Fretboard_engraver.
But it doesn't say it's used in FretBoards-context exclusively.

You already found maximumFretStretch in the determine-frets-procedure
in translation-functions.scm which is the
`noteToFretFunction', read by Fretboard_engraver *and*
Tab_note_heads_engraver (in TabVoice).

> Don't you think that it should be mentionned  in the Tablature section of
> the manual that, at least, you have to type all the string numbers involved
> in a more than default stretch ?
>
> By the way, is there a way to override this default, just for a score or a
> section of it ?

Just change maximumFretStretch:

\score {
  <<
    \new TabStaff
      {
            <c' bes'>
            \set maximumFretStretch = 5
            <c'\2 bes'>
            \unset maximumFretStretch
            <c' bes'>
      }
    \new TabStaff
    %% as a general setting for this TabStaff:
    \with { maximumFretStretch = 5 }
      {
            <c' bes'>
            <c'\2 bes'>
            <c' bes'>
      }
  >>
  \layout {
    \context {
      \TabStaff
      %% as a general setting for all TabStaffs
      %maximumFretStretch = 5
    }
  }
}

Nevertheless, usage of this maximumFretStretch-property is pretty
under-documented, imho.


Cheers,
  Harm