Re: Subscripted text and centering of TextSpanner line

[James Bailey]

On Oct 8, 2010, at 7:25 AM, Nick Payne wrote:

> If I have text characters at the left end of a TextSpanner, and some of those 
> characters are subscripted, then the centering of the TextSpanner line seems 
> to be calculated using the total height of both the main and subscripted 
> text, which puts the line at the bottom of the main text rather than being 
> centered on it. While this makes some sort of sense, I think that asking for 
> the line to be centered means that I'm asking for it to be centered on the 
> main text.
> 
> %===========================================
> \version "2.13.35"
> 
> #(set-global-staff-size 30)
> 
> \relative c'' {
>    \once \override TextSpanner #'bound-details #'left #'text = \markup { 
> \concat { CII " " } }
>    \once \override TextSpanner #'style = #'line
>    \once \override TextSpanner #'font-shape = #'upright
>    \once \override TextSpanner #'direction = #UP
>    \once \override TextSpanner #'bound-details #'right #'text =
>        \markup { \draw-line #'(0 . -0.5) }
>    \once \override TextSpanner #'bound-details #'left #'stencil-align-dir-y = 
> #CENTER
>    gis16\startTextSpan b e b' e e, b' e\stopTextSpan
>    \once \override TextSpanner #'bound-details #'left #'text =
>        \markup { \concat { "CII" \sub 3 " " } }
>    \once \override TextSpanner #'style = #'line
>    \once \override TextSpanner #'font-shape = #'upright
>    \once \override TextSpanner #'direction = #UP
>    \once \override TextSpanner #'bound-details #'right #'text =
>        \markup { \draw-line #'(0 . -0.5) }
>    \once \override TextSpanner #'bound-details #'left #'stencil-align-dir-y = 
> #CENTER
>    gis,,\startTextSpan b e b' e e, b' e\stopTextSpan
> }
> %===========================================

Just an idea, but overriding the baseline may get what you want, but has the 
disadvantage of making knowing how much to override the baseline by difficult.