Documentation/snippets/center-text-below-hairpin-dynamics.ly

   1 %% DO NOT EDIT this file manually; it is automatically
   2 %% generated from LSR http://lsr.di.unimi.it
   3 %% Make any changes in LSR itself, or in Documentation/snippets/new/ ,
   4 %% and then run scripts/auxiliar/makelsr.py
   5 %%
   6 %% This file is in the public domain.
   7 \version "2.19.22"
   8
   9 \header {
  10   lsrtags = "expressive-marks, really-cool, scheme-language, text"
  11
  12   texidoc = "
  13 This example provides a function to typeset a hairpin (de)crescendo
  14 with some additional text below it, such as @qq{molto} or @qq{poco}.
  15 The added text will change the direction according to the direction of
  16 the hairpin. The Hairpin is aligned to DynamicText.
  17
  18 The example also illustrates how to modify the way an object is
  19 normally printed, using some Scheme code.
  20
  21 "
  22   doctitle = "Center text below hairpin dynamics"
  23 } % begin verbatim
  24
  25 hairpinWithCenteredText =
  26 #(define-music-function (text) (markup?)
  27   #{
  28     \once \override Voice.Hairpin.after-line-breaking =
  29       #(lambda (grob)
  30         (let* ((stencil (ly:hairpin::print grob))
  31                (par-y (ly:grob-parent grob Y))
  32                (dir (ly:grob-property par-y 'direction))
  33                (new-stencil (ly:stencil-aligned-to
  34                  (ly:stencil-combine-at-edge
  35                    (ly:stencil-aligned-to stencil X CENTER)
  36                    Y dir
  37                    (ly:stencil-aligned-to
  38                      (grob-interpret-markup grob text) X CENTER))
  39                  X LEFT))
  40                (staff-space (ly:output-def-lookup
  41                  (ly:grob-layout grob) 'staff-space))
  42                (staff-line-thickness
  43                  (ly:output-def-lookup (ly:grob-layout grob) 'line-thickness))
  44                (par-x (ly:grob-parent grob X))
  45                (dyn-text (grob::has-interface par-x 'dynamic-text-interface))
  46                (dyn-text-stencil-x-length
  47                  (if dyn-text
  48                    (interval-length
  49                      (ly:stencil-extent (ly:grob-property par-x 'stencil) X))
  50                    0))
  51                (x-shift
  52                  (if dyn-text
  53                    (-
  54                      (+ staff-space dyn-text-stencil-x-length)
  55                      (* 0.5 staff-line-thickness)) 0)))
  56
  57         (ly:grob-set-property! grob 'Y-offset 0)
  58         (ly:grob-set-property! grob 'stencil
  59            (ly:stencil-translate-axis
  60             new-stencil
  61             x-shift X))))
  62   #})
  63
  64 hairpinMolto =
  65 \hairpinWithCenteredText \markup { \italic molto }
  66
  67 hairpinMore =
  68 \hairpinWithCenteredText \markup { \larger moltissimo }
  69
  70 \layout { ragged-right = ##f }
  71
  72 \relative c' {
  73   \hairpinMolto
  74   c2\< c\f
  75   \hairpinMore
  76   c2\ppppp\< c\f
  77   \break
  78   \hairpinMolto
  79   c2^\< c\f
  80   \hairpinMore
  81   c2\ppppp\< c\f
  82 }