Center text below hairpin dynamics

This example provides a function to typeset a hairpin (de)crescendo with some additional text below it, such as “molto” or “poco”. The added text will change the direction according to the direction of the hairpin. The Hairpin is aligned to DynamicText.

The example also illustrates how to modify the way an object is normally printed, using some Scheme code.

\paper { tagline = ##f }

hairpinWithCenteredText =
#(define-music-function (text) (markup?)
    \once \override Voice.Hairpin.after-line-breaking =
      #(lambda (grob)
        (let* ((stencil (ly:hairpin::print grob))
               (par-y (ly:grob-parent grob Y))
               (dir (ly:grob-property par-y 'direction))
                 (ly:output-def-lookup (ly:grob-layout grob) 'line-thickness))
               (new-stencil (ly:stencil-aligned-to
                   (ly:stencil-aligned-to stencil X CENTER)
                   Y dir
                           (+ (ly:staff-symbol-staff-space grob)
                              (/ staff-line-thickness 2)))
                           text)) X CENTER))
                 X LEFT))
               (staff-space (ly:output-def-lookup
                 (ly:grob-layout grob) 'staff-space))
               (par-x (ly:grob-parent grob X))
               (dyn-text (grob::has-interface par-x 'dynamic-text-interface))
                 (if dyn-text
                     (ly:stencil-extent (ly:grob-property par-x 'stencil) X))
                 (if dyn-text
                     (+ staff-space dyn-text-stencil-x-length)
                     (* 0.5 staff-line-thickness)) 0)))

        (ly:grob-set-property! grob 'Y-offset 0)
        (ly:grob-set-property! grob 'stencil
            x-shift X))))

hairpinMolto =
\hairpinWithCenteredText \markup { \italic molto }

hairpinMore =
\hairpinWithCenteredText \markup { \larger moltissimo }

\layout { ragged-right = ##f }

\relative c' {
  c2\< c\f
  c2\ppppp\< c\f
  c2^\< c\f
  c2\ppppp\< c\f

[image of music]

LilyPond snippets v2.25.17 (development-branch).