-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Am Donnerstag, 14. August 2008 schrieb Valentin Villenave: > 2007/7/8 Dewdman42 <[EMAIL PROTECTED]>: > > I can't seem to find anything in the Lilypond manual about creating harp > > pedal symbols. I would think this issue has been covered a lot by users > > of Lilypond. how do I do it, or something like it: > > > > http://www.nabble.com/file/p11492013/ScreenHunter_03%2BJul.%2B08%2B12.40. > >jpg > > Greetings Carl, hi everybody, > > I've been trying to implement this harp diagrams feature for a while, > but my implementation is quite dirty and not fully working.
Here's my attempt, which defines a \harp-pedal #"^v-|^--v" markup command (plus a version, which takes a list of 1, 0, -1 and #\| - unfortunately that version has some caveats as detailled in the .ly file). Should this be included in git? Cheers, Reinhold - -- - ------------------------------------------------------------------ Reinhold Kainhofer, Vienna University of Technology, Austria email: [EMAIL PROTECTED], http://reinhold.kainhofer.com/ * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/ * K Desktop Environment, http://www.kde.org, KOrganizer maintainer * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD4DBQFIpKn0TqjEwhXvPN0RAn8fAJ4o8jqAtCE7moet33By5m5428ZONgCYlUnP IUQpO/BYuljGEj7V5bi2Qw== =bf8X -----END PGP SIGNATURE-----
\version "2.11. 55"
\paper {
ragged-right = ##f
}
% The following defines a new markup command
% \harp-pedal #"^-v|--v^"
% for harp pedal diagrams. Possible values in the string are:
% ^ ... pedal is up
% - ... pedal is neutral
% v ... pedal is down
% | ... vertical divider line
% The function does not check if the string has the typical form of three
% pedals, then the divider and then the remaining four pedals. Instead it
% simply prints each symbol in the order as given. This means you can place
% the divider (even multiple dividers) anywhere you want.
%
% There is also a \harp-pedal-verbose version, which
% takes a list of directions and a possible |. Unfortunately, it has some
% caveats:
% 1) the | cannot be given as a string "|", but as a character #\|
% 2) if one wants to use directions like UP, CENTER or DOWN, one cannot use
% '(UP DOWN CENTER #\| ....), because the contents of that list are
% never evaluated. Instead one has to explicitly create a list like
% (list UP DOWN CENTER #\| ....)
#(define-markup-command (harp-pedal-verbose layout props pedal-list) (list?)
"Make a harp pedal diagram containing the directions indicated in @var{pedal-list}.
For example,
@example
\\markup \\pedal-diagram-verbose #'(1 0 -1 #\\| 0 0 1 1)
\\markup \\pedal-diagram-verbose #(list UP CENTER DOWN #\\| CENTER CENTER UP UP)
@end example
"
(make-harp-pedal layout props pedal-list))
#(define-markup-command (harp-pedal layout props definition-string) (string?)
"Make a harp pedal diagram. For example, say
@example
\\markup \\harp-pedal #\"^-v|^^^^\"
@end example
"
(make-harp-pedal layout props (harp-pedals-parse-string definition-string)))
#(define (harp-pedals-parse-string definition-string)
"Parse a harp pedals diagram string and return a list containing 1, 0, -1 or #\\|"
(map (lambda (c)
(case c
((#\^) 1)
((#\v) -1)
((#\-) 0)
((#\|) #\|)
(else c)))
(string->list definition-string)))
#(define (make-harp-pedal layout props pedal-list)
"Make a harp pedals diagram markup"
; FIXME the size variable should be defined by a prop. lookup
(define sz 1.2)
; TODO is it worth adding a thickness variable here?
(let* ((x (* sz 4))
(y (* sz 2))
(box-width (* sz 0.4))
(box-height (* sz 1))
(space (* sz 0.5))
(box-x-dimensions (lambda (prev-x p) (cons (+ prev-x space)
(+ prev-x space box-width))))
(box-y-dimensions (lambda (prev-x p) (cons (+ (- y (/ box-height 2)) p)
(+ y (/ box-height 2) p))))
(divider-command (lambda (xpos) (list 'draw-line 0.2 xpos 0 xpos (* y 2))))
(result (let process-pedal ((remaining pedal-list)
(prev-x 0)
(stencils '()))
(if (null? remaining)
(cons prev-x stencils)
(case (car remaining)
((1 0 -1)
(let* ((p (car remaining))
(stencil (make-filled-box-stencil
(box-x-dimensions prev-x p) (box-y-dimensions prev-x p)))
(new-prev-x (+ prev-x space box-width space)))
(process-pedal (cdr remaining) new-prev-x (cons stencil stencils))))
((#\|)
(let* ((xpos (+ prev-x space))
(stencil (ly:make-stencil (divider-command xpos)))
(new-prev-x (+ prev-x (* 2 space))))
(process-pedal (cdr remaining) new-prev-x (cons stencil stencils))))
(else
(display "unhandled entry in harp-pedal:")
(display (car remaining))
(newline)
(process-pedal (cdr remaining) prev-x stencils))))))
(final-x (car result))
(stencils (reverse (cdr result))))
; Add the horizontal line and combine all stencils:
(apply ly:stencil-add
(cons
(ly:make-stencil (list 'draw-line 0.2 0 y final-x y))
stencils))))
\relative c'' {
c1^\markup \harp-pedal #"^v-|vv^-"
c1_\markup \harp-pedal-verbose #'(1 -1 0 #\| -1 -1 1 0)
c1^\markup \harp-pedal-verbose #(list UP DOWN CENTER #\| DOWN DOWN UP CENTER)
% invalid pedal specifications, which still should be handled gracefully:
c1^\markup \harp-pedal #""
c1^\markup \harp-pedal #"asfdvx"
}
harp_pedals.pdf
Description: Adobe PDF document
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