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;;ShapeTieWider
(let ((tag "TieShape")(amount 0.0)(data #f)(width #f))
(set! data (d-DirectiveGet-standalone-data tag))
(if data
(begin
(set! data (eval-string data))
(set! width (* 2 (car (list-ref data 3)))))
(begin
(set! data '((0 . 0) (0 . 0) (0 . 0) (0 . 0)))))
(if (not width)
(set! width 0.0))
(set! amount (number->string width))
(set! amount (d-GetUserInput (_ "Width of Tie") (_ "Give additional width (unit = staff line space):") amount))
(if (and amount (string->number amount))
(begin
(set! amount (exact->inexact (/ (string->number amount) 2)))
;modify the (car (list-ref data 3)) to become amount ...
(list-set! data 3 (cons amount (cdr (list-ref data 3))))
(list-set! data 0 (cons (- amount) (cdr (list-ref data 0))))
(d-Directive-standalone tag)
(d-DirectivePut-standalone-minpixels tag 30)
(d-DirectivePut-standalone-display tag "~")
(d-DirectivePut-standalone-data tag (format #f "'~A" data))
(d-DirectivePut-standalone-postfix tag (string-append "\\shape #'" (format #f "~A" data) " Tie "))))
(d-RefreshDisplay)
(d-SetSaved #f))
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