Re: StaffSymbol: behaviour of ledger-line-thickness

[till Rettig]

thanks for the quick answer. I tried now to figure out how to apply changes to 
StaffSymbol properties. It seems they work only as \with \override for a new 
staff or inside the layout block. That would mean that they cannot be changed 
on the fly but are preset for every score. Is this correct?

Till


-------- Original-Nachricht --------
> Datum: Mon, 31 Mar 2008 18:32:51 +0200
> Von: Reinhold Kainhofer <address@hidden>
> An: address@hidden, "till Rettig" <address@hidden>
> Betreff: Re: StaffSymbol: behaviour of ledger-line-thickness

> Am Montag, 31. März 2008 schrieb till Rettig:
> > Hi,
> > could somebody explain me how ledger-line-thickness behaves? The IR
> states
> > that it should be a pair:
> >
> > "ledger-line-thickness (pair of numbers)
> >     The thickness of ledger lines. It is the sum of 2 numbers: The first
> is
> > the factor for line thickness, and the second for staff space. Both
> > contributions are added. "
> >
> > But I cannot get the staff space bigger (the second number), instead the
> > first number influences the thickness of the ledger line a bit, the
> second
> > quite much, that is it becomes so heavy that the spaces almost
> disappear.
> 
> Yes, because they use different units: 
> -) The first one is a multiplier for the default thickness (quite small, ~
> staff-space/10 )
> -) The second one is an explicit width (in staff spaces, i.e. the default 
> distance between two staff lines or ledger lines)
> 
> The final distance is then:
> ( thickness * line-thickness * #1 ) + #2
> 
> Since the default thickness is quite small, of course the first number 
> influences the width only a little bit, while the second (measured in 
> different units!) increases it a lot.
> Actually, the following two settings produce roughly the same (i.e. ledger
> lines so thick that they touch each other:
> 
> \override StaffSymbol #'ledger-line-thickness = #'( 10 . 0 )
> \override StaffSymbol #'ledger-line-thickness = #'( 0 . 1 )
> 
> 
> And, yes, even Han-Wen agrees that this is confusing. See his comment in 
> lily/staff-symbol.cc:
>   /*
>     For raggedright without ragged staves, simply set width to the
> linewidth.
>     (ok -- lousy UI, since width is in staff spaces)
>     --hwn.
>   */
> 
> > the second 
> > quite much, that is it becomes so heavy that the spaces almost
> disappear.
> > Please compare the example:
> 
> Things work as expected: The default line width is quite small and the
> first 
> number is a multiplier for the default line width. The second one gives an
> additional width in staff space (i.e. the distance between each of the
> five 
> lines of a standard staff).
> 
> >   \override StaffSymbol #' ledger-line-thickness  = #' ( 1 . .1 )
> 
> This uses the default line width + 1/10 of the staff space = 1/5 staff
> space
> 
> >   \override StaffSymbol #' ledger-line-thickness = #' ( .1 . 1 )
> 
> This decreases the line with to 1/10 of its default (1/100 staff space!),
> but 
> adds a full staff space (=distance between two ledger lines!), so of
> course 
> all ledger lines touch each other.
> 
> 
> Cheers,
> Reinhold
> -- 
> ------------------------------------------------------------------
> Reinhold Kainhofer, Vienna University of Technology, Austria
> email: address@hidden, http://reinhold.kainhofer.com/
>  * Financial and Actuarial Mathematics, TU Wien,
> http://www.fam.tuwien.ac.at/
>  * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
>  * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/

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