Hi Andrew,
I can’t comment on whether there is a clear point to be made in favour
of either LilyPond syntax or using the scheme markup macro. Anyway,
surely you can call with-dimensions from Scheme as well, either from the
markup macro (which is covered in the Extending Manual,
<http://lilypond.org/doc/v2.19/Documentation/extending/markup-construction-in-scheme.html>)
<http://lilypond.org/doc/v2.19/Documentation/extending/markup-construction-in-scheme.html%3E%29>
as #:with-dimensions or directly as make-with-dimensions-markup.
HTH, Simon
Am 22-Feb-2017 03:21:41 +0100 schrieb andrew.bern...@gmail.com:
Just a question about with-dimensions in markup. I have a simple
function which is to draw a line between two specified points, not
just to an end point as per the draw-line type functions. Unless you
specify with-dimensions at the point of calling the markup command,
it starts at the (0 . 0) point. While I can understand this, the
question is, can the with-dimensions function (I use the term
function loosely here) be incorporated into the scheme markup
command? Or is this a case for writing the markup in lilypond syntax
in the scheme function and using the with-dimensions that way? I was
unable to find a scheme with-dimensions function - I imagine that is
because the dimension calculations happens at a different stage of
the layout computation?
I want this function rather than an alternate solution as it is a
cut down MWE of a more elaborate function that incorporates some
other graphic commands as well.
So then as a second question, is it better to write
define-markup-command functions in all Scheme, or to use lilypond
syntax therein? I seem to recall some brief mention of this point in
the list some time ago, but I never got the impression of a
definitive answer or firm recommendation.
Andrew
== snip
version "2.19.55"
#(define-markup-command (line-from-to layout props from to)
(number-pair? number-pair?)
#:properties ((thickness 0.15))
(let* ((startx (car from))
(starty (cdr from))
(endx (car to))
(endy (cdr to)))
(make-line-stencil thickness startx starty endx endy)))
{
c'4
^markup draw-line #'(4 . 4)
c'4
^markup line-from-to #'(0.5 . -3) #'(3 . 3)
c'4
^markup with-dimensions #'(0 . 0) #'(0 . 0) line-from-to #'(0.5 .
-3) #'(3 . 3)
}
== snip
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