(define (dashed-line thick on off dx dy)
(string-append
- (ly-number->string dx)
+ (ly-number->string (* dx (/ 72 72.27)))
" "
(ly-number->string dy)
" "
- (ly-number->string thick)
+ (ly-number->string (* thick (/ 72 72.27)))
" [ "
(ly-number->string on)
" "