Re: problem with installed font when set-global-staff-size is changed

[tisimst]

    Jonathan

On 8/11/2015 5:15 PM, jonathan.scholbach [via Lilypond] wrote:

> (Setting
>       the font-sizes manually is necessary since for some unknown
>       
>       reason, the font-size decreases.) 
>     
    
    This is because virtually everything that has any kind of font
    property is scaled relative to the staff-height. So, at 20pt
    staff-height, a 12pt font looks just right, but at 17pt
    staff-height, it ends up being scaled down to 12*(17/20) = 10.2pt.
    There are ways around this, though. Markups have the \abs-fontsize
    macro, but there isn't a built-in one for anything else, like
    Lyrics. A really nice macro was put together by Mike Solomon so the
    "absolute" nature of font size can be applied to any other kind of
    text object. Here's the code for it:
    
    allowGrobCallback =
      #(define-scheme-function (parser location syms)
        (symbol-list?)
         (let ((interface (car syms))
               (sym (cadr syms)))
           #{
             \with {
               \consists #(lambda (context)
                 `((acknowledgers .
                   ((,interface . ,(lambda (engraver grob
        source-engraver)
                     (let ((prop (ly:grob-property grob sym)))
                       (if (procedure? prop)
        (ly:grob-set-property! grob sym (prop grob)))
                 )))))))
             }
           #}))
      
      absFontSize =
      #(define-scheme-function (parser location pt)(number?)
         (lambda (grob)
           (let* ((layout (ly:grob-layout grob))
                  (ref-size (ly:output-def-lookup
        (ly:grob-layout grob) 'text-font-size 12)))
             (magnification->font-size (/ pt ref-size))
             )))
      
      \layout {
        \context {
          \Score
          \allowGrobCallback font-interface.font-size
        }
      }
    
    which you then can use like this:
    
      \override LyricText.font-size = \absFontSize 11.5
    
    Without this, then to get back up to 12pt you'd need to manually
    increase the font-size, which is what you've learned already.
    
    Regards,
    Abraham

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