Re: Calculate BarLine 'kern to fit with a given stencil-x-extent

[Pierre Perol-Schneider]

Hi Harm, Hi Thomas,

Thomas Morley <address@hidden> writes:

> So far as I can observe the calculations isn't exact: with higher or
> lower staff-size values it goes increasingly wrong.
> Did I something wrong while tranforming your calculation into scheme?

Looks fine to me. 

2013/7/10 David Kastrup <address@hidden> 

I think the above is just a curve fitting, not a model of what LilyPond
actually does.  So it's not surprising it goes wrong for larger/smaller
values.

 

Right.

Well as a first step I wanted to find a correcting parameter but it looks weird.

(see enclosed).

So I think I'm looking into a wrong direction.

Yesterday evening (looking at the beach sunset...)  I was thinking that, thanks to the stability of the Y-height (4.0) maybe we would find more acurated figures of the x-length if calculated after the hypotenuse. 

\version "2.17.21"

#(set-global-staff-size 20)

\paper { 

   ragged-right = ##t 

}

% Better viewing

\layout {

        \override Score.RehearsalMark #'color = #red

        \override Score.RehearsalMark #'layer = #10

        %%%% Y-offset is slightly staff-size related

        \override Score.RehearsalMark #'extra-offset = #'(0 . -4.845)

}

{

        R1

        \mark \markup \draw-line #'(0 . 4)

        \override Staff.BarLine.kern = #1

        \bar "||"

        R1

}

{

        R1

        \mark \markup \draw-line #'(0 . 4)

        \override Staff.BarLine.kern = #2

        \bar "||"

        R1

}

{

        R1

        \mark \markup \draw-line #'(0 . 4)

        \override Staff.BarLine.kern = #10

        \bar "||"

        R1

}

{

        R1

        \mark \markup \draw-line #'(0 . 4)

        \override Staff.BarLine.kern = #20

        \bar "||"

        R1

}

{

        R1

        \mark \markup \draw-line #'(0 . 4)

        \override Staff.BarLine.kern = #50

        \bar "||"

        R1

}

I've started some calculation without real success so far.

So here we are.

Any other idea ?

x-length-corr.png
Description: PNG image