Re: Extra staves

[Mats Bengtsson]

An alternative, outlined in my reply yesterday is

\score {
        \context StaffGroup {
                \notes {
                        \context Staff = One {c4 d e f}
                        <<
                                {c d e f c d e f}
                                \context Staff = Two {
                                \property Staff.Clef=\turnOff
                                \property Staff.TimeSignature=\turnOff
                                c4 d e f c d e f}
                        >>
                        c d e f
                }
        }
        \paper {
                raggedright = ##t
                \translator {
                        \StaffGroupContext
                        \remove System_start_delimiter_engraver
                }
                \translator {
                        \ScoreContext
                        \remove System_start_delimiter_engraver
                }
        }
}


If you want to add new context types, you have to incorporate them into
the context hierarchy using the \accepts declaration. In this case, you
tell LilyPond that Score contexts may contain SubStaff contexts.
Also, it's a good idea to make it from an existing context type instead
of writing it from scratch. Finally, you could use the \alias
declaration to tell LilyPond that your SubStaff context should be
treated like a Staff context. The resulting declarations could look
like this:

        \paper {
                raggedright = ##t
                \translator {
                        \ScoreContext
                        \consists Span_bar_engraver
                        \remove System_start_delimiter_engraver
                        \accepts "SubStaff"
                }
                \translator {
                        \StaffContext
                        \name "SubStaff"
                        \alias "Staff"
                        \remove "Clef_engraver"
                }
        }


   /Mats

Ralph Little wrote:
> Hi,
> Further to what I posted earlier, I have tried the following which is my
> best attempt at a neat "hanging" second staff for a temporary staff:
>
> -----------8<-----------8<-----------8<-----------8<-----------8<-----------
> 8<--
> \score {
>         \notes {
>                 \context Staff = One { c4 d e f }
>                 <<
>                         {c d e f c d e f}
>                         \context SubStaff = Two { c4 d e f c d e f}
>                 >>
>                 c d e f
>         }
>         \paper {
>                 raggedright = ##t
>                 \translator {
>                         \ScoreContext
>                         \consists Span_bar_engraver
>                         \remove System_start_delimiter_engraver
>                 }
>                 \translator {
>                         \type "Engraver_group_engraver"
>                         \name "SubStaff"
>                         \remove "Clef_engraver"
>                 }
>         }
> }
> -----------8<-----------8<-----------8<-----------8<-----------8<-----------
> 8<--
>
> I'm trying to remove the clef from the second stave by creating a new
> context that removes the respective engravers.
> I get an error though:
>
>
> Interpreting music...warning: can't find or create `SubStaff' called `Two'
> lilypond-bin: event-chord-iterator.cc:27: virtual Translator_group*
> Event_chord_iterator::get_req_translator(): Assertion `report_to ()' failed.
>
> lilypond: error: LilyPond crashed (signal 6).
>
> Have I misunderstood the translator syntax or is there a bug?
>
> Cheers,
> Ralph
>
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--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
        Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================