Et voilà (à zoomer à 800 % pour voir quelque chose) :
\version "2.18.2"
dessin = \markup {
\with-dimensions #'(0 . 0) #'(0 . 0)
\epsfile #Y #18.5 #"dessin.eps"
}
\relative c' {
c4
-\tweak extra-offset #'(-8.5 . -7.6)
-\tweak layer #-2
-\dessin
-\tweak extra-offset #'(0 . -1.1)
-\markup {
\combine
\path #0.1 #'(
(moveto -0.3 0.0)
(curveto -0.3 0.0 -0.5 1.1 0.3 1.2)
(lineto 13.4 2.4)
(curveto 14.3 2.5 14.7 2.9 15.7 2.9)
(curveto 16.8 2.9 17.0 1.3 18.4 1.3)
(curveto 20.5 1.3 19.8 2.9 22.0 2.9)
;; etc.
)
% tangentes :
\with-color #red \path #0.05 #'(
(moveto -0.3 0.0)
(lineto -0.3 0.0)
(moveto -0.5 1.1)
(lineto 0.3 1.2)
(moveto 13.4 2.4)
(lineto 14.3 2.5)
(moveto 14.7 2.9)
(lineto 15.7 2.9)
(lineto 16.8 2.9)
(moveto 17.0 1.3)
(lineto 18.4 1.3)
(lineto 20.5 1.3)
(moveto 19.8 2.9)
(lineto 22.0 2.9)
;; etc.
)
}
d e f g8 a b c d e f g
}
Cordialement,
Pierre