Re: StaffSymbol: behaviour of ledger-line-thickness

[Till Rettig]

Oh, that's true, I will write this in the staff section of the Docu. 
Thanks for all the help!

Greetings
Till

Mats Bengtsson schrieb:
> The properties of a layout object are only read when the object is 
> created, so
> for StaffSymbol, for example, this means that you have to do the 
> setting at
> the top of the score. However, if you want to change it in the middle 
> of a
> score, you can insert
> \stopStaff \startStaff
> which finishes the previous StaffSymbol object and creates a new one 
> which
> reads the new property setting.
>
>   /Mats
>
> till Rettig wrote:
> > 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/
> > >     
> >
> >