input/new/changing-properties-for-individual-grobs.ly

   1 \version "2.12.0"
   2
   3 \header {
   4   lsrtags = "tweaks-and-overrides"
   5
   6   texidoc = "
   7 The @code{\\applyOutput} command allows the tuning of any layout
   8 object, in any context.  It requires a Scheme function with three
   9 arguments."
  10
  11   doctitle = "Changing properties for individual grobs"
  12 }
  13
  14 #(define (mc-squared grob grob-origin context)
  15   (let*
  16     (
  17       (ifs (ly:grob-interfaces grob))
  18       (sp (ly:grob-property grob 'staff-position))
  19     )
  20     (if (memq 'note-head-interface ifs)
  21       (begin
  22         (ly:grob-set-property! grob 'stencil
  23           (grob-interpret-markup grob
  24             (make-lower-markup 0.5
  25               (case sp
  26                 ((-5) "m")
  27                 ((-3) "c ")
  28                 ((-2) (make-smaller-markup (make-bold-markup "2")))
  29                 (else "bla")
  30                 ))))
  31         ))))
  32
  33 \relative c' {
  34   <d f g b>2
  35   \applyOutput #'Voice #mc-squared
  36   <d f g b>2
  37 }