Hi,
I try to define a markup for vertical arrows and can't get the
function to take two numbers as arguments. Using strings as arguments
or a number and a string works. It seems the last argument to
define-markup-command has to be a string. Does anybody know why and
how to make it work with numbers? I'd rather supply the y-offset and
length of the arrow as a number.
This doesn't work:
\version "2.11.2"
#(define-markup-command (varrow layout props yoff len) (number? number?)
(interpret-markup layout props
(markup
#:line
(#:postscript
(string-append
"1 1 scale 0.1 setlinewidth 0 "
(number->string yoff)
" translate 0 0 moveto -0.25 1 lineto 0.25 1 lineto 0 0 lineto closepath
fill 0 1 moveto 0 "
(number->string len)
" rlineto stroke")))))
{c4^\markup {\varrow #3 #10}}
lilypond signals an error about the 10 being an unbound variable. I
don't get this error when supplying the "10" directly as a string:
This works:
\version "2.11.2"
#(define-markup-command (varrow layout props yoff len) (number? string?)
(interpret-markup layout props
(markup
#:line
(#:postscript
(string-append
"1 1 scale 0.1 setlinewidth 0 "
(number->string yoff)
" translate 0 0 moveto -0.25 1 lineto 0.25 1 lineto 0 0 lineto closepath
fill 0 1 moveto 0 "
len
" rlineto stroke")))))
{c4^\markup {\varrow #3 #"10"}}
--
Orm
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