Hi Kieren,
Here's a first quick draft:
\version "2.19"
#(define-markup-command (curvedArrow layout props thk mlt) (number? number?)
(interpret-markup layout props
(markup
(#:stencil
(make-path-stencil
'(M 3.01 -0.22
C 6.17 1.59 9.88 1.09 13.35 1.05
C 13.47 1.19 12.99 1.75 13.23 1.94
C 14.66 1.15 16.91 0.92 16.93 0.71
C 16.93 0.57 15.13 0.56 13.32 -0.37
C 13.17 -0.09 13.48 0.31 13.35 0.50
C 10.56 0.59 7.90 0.73 5.97 0.33
C 4.04 -0.07 -0.16 -2.02 3.01 -0.22
Z)
thk mlt mlt #t)))))
\markup \curvedArrow #.1 #1
Regarding the length and the height, would they affect the curve and the arrow or the curve only?