RE: Layout of a (piano) hand indicator

[foxfanfare]

(* I forgot the function:

hook =
#(let ((direction? (lambda (n) (= 1 (abs n))))
        (hook-markup #{ \markup \path #0.12 #'((moveto 0 0)
                                                (rlineto -0.85 0)
                                                (rlineto 0 3)) #}))
    (define-event-function (direction on-line)
      (direction? boolean?)
      
      (let* ((self-al (if on-line 0 0.31))
             (self-al (if (= direction 1) (- self-al) self-al)))
        
        #{
          \tweak self-alignment-Y $self-al
          \tweak extra-offset #'(0.75 . 0)
          \tweak extra-spacing-width #'(-0.5 . 0)
          \finger \markup \scale #(cons 1 direction) #hook-markup
        #})))



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