Re: Create different pdf layers
Hello, 2013/8/1 Urs Liska u...@openlilylib.org I have brought this up before without success. But as my interest reappeared I'll try it again with a slightly more specific question. there is an existing issue based on your request: http://code.google.com/p/lilypond/issues/detail?id=2542 Do you believe, it is a good Idea to discus your Ideas on bug-list? Marek, one of the very few bug squad members ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Create different pdf layers
On 1 août 2013, at 11:15, Urs Liska u...@openlilylib.org wrote: I have brought this up before without success. But as my interest reappeared I'll try it again with a slightly more specific question. When LilyPond finally renders its objects 'on paper' how complicated would it be to allow it to print on layers that show up as separate layers in the final pdf? I would consider this a very useful enhancement. As a first step this could and should be done without any layout considerations, i.e. without changing anything in the layout engine. Simply put grobs on the default or a dedicated layer with a syntax something like \new Layer = Annotations \change Layer = Annotations \change Layer = Default Instead of the \new Layer command I also could imagine defining layers in the \paper block Hey Urs, Great idea - this would be useful. As far as I know, the PS standard doesn't support any native form of layering, and LilyPond pre-renders to PS before PDF. I think your best bet would be to give objects ids in SVG (i.e. \override NoteHead.id = #foo) and then write an XML parser to combine variously id'd objects into SVG groups. Python's xml.dom.minidom library is great for this. I'm not sure how this information would translate into PDF layers (nor am I sure if all PDF readers support layers), but it'd certainly allow you to have a layered approach in something like Inkscape. Cheers, MS ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Create different pdf layers
Hi Urs,
isn't the layer grob property what you want?
This is what I use to interrupt ties (or slurs) if they collide with a
time signature:
% to have the time sig behind the staff symbol
\override Staff.TimeSignature #'layer = #-5
% whiteout anything behind the time sig
\override Staff.TimeSignature #'whiteout = ##t
% ties are behind the time sig
\override Tie #'layer = #-10
Now you can listen for the grob-interface and look, if its set to a
specific number and then do anything whith the grob (color it or set the
stencil to #f)
The layer may be a procedure, so it may be set conditionally by some
other method.
Best, Jan-Peter
On 01.08.2013 10:15, Urs Liska wrote:
I have brought this up before without success. But as my interest
reappeared I'll try it again with a slightly more specific question.
When LilyPond finally renders its objects 'on paper' how complicated
would it be to allow it to print on layers that show up as separate
layers in the final pdf?
I would consider this a very useful enhancement.
As a first step this could and should be done without any layout
considerations, i.e. without changing anything in the layout engine.
Simply put grobs on the default or a dedicated layer with a syntax
something like
\new Layer = Annotations
\change Layer = Annotations
\change Layer = Default
Instead of the \new Layer command I also could imagine defining layers
in the \paper block
There is much more potential in this, but just to show what I mean
(with a known construct):
If I could print the result of annotate-spacing on a different layer I
could simply switch that layer on and off in a pdf viewer.
Or if I have layout-indifferent additions like the control-points
visualization in
http://lilypondblog.org/wp-content/uploads/2013/07/chopin-beams-5.preview.png
it would be nice to be able to switch them on and off without having
to recompile the file.
Any ideas?
Urs
PS: As a first step it already would be nice to know
- where (in the code) LilyPond actually 'prints' its objects (and
where to)
- where I can find concise and understandable information about how
PDF layers are created
(in the sense of creating them when writing a file, not how to
create them in Acrobat or the like)
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\version 2.16.1
gac = #(make-engraver
(acknowledgers
((grob-interface engraver grob source-engraver)
(let ((layer (ly:grob-property grob 'layer)))
(ly:message ~A layer ~A grob layer)
(if (eq? 1 layer) (ly:grob-set-property! grob 'color red))
))
))
\layout {
\context {
\Score
\consists #gac
\override NoteHead #'layer = #(lambda (grob) 1)
}
}
\relative c'' { c4 }
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Re: Create different pdf layers
Mike Solomon m...@mikesolomon.org writes: As far as I know, the PS standard doesn't support any native form of layering, and LilyPond pre-renders to PS before PDF. But it converts the PostScript to PDF using Ghostscript, and Ghostscript will both read and write PDF and PostScript, so it is quite likely that there are some instructions in Ghostscript's version of the PostScript language that would get converted into layer instructions in PDF. For example, we use the pdfmark command for generating embedded links. -- David Kastrup ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Create different pdf layers
Am 2013-08-01 um 15:25 schrieb David Kastrup d...@gnu.org: Mike Solomon m...@mikesolomon.org writes: As far as I know, the PS standard doesn't support any native form of layering, and LilyPond pre-renders to PS before PDF. But it converts the PostScript to PDF using Ghostscript, and Ghostscript will both read and write PDF and PostScript, so it is quite likely that there are some instructions in Ghostscript's version of the PostScript language that would get converted into layer instructions in PDF. For example, we use the pdfmark command for generating embedded links. Of course, you can get nearly every PDF feature through PS using pdfmarks. Greetlings, Hraban --- fiëé visuëlle Henning Hraban Ramm http://www.fiee.net http://angerweit.tikon.ch/lieder/ https://www.cacert.org (I'm an assurer) ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Create different pdf layers
Am 01.08.2013 11:07, schrieb Jan-Peter Voigt: isn't the layer grob property what you want? no, it isn't ... but if one comes up with the right pdfmark ps command, there has to be a check of this layer property to avoid inconsistent lily- and pdf-layers. Best, Jan-Peter ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Create different pdf layers
Jan-Peter Voigt jp.vo...@gmx.de schrieb: Am 01.08.2013 11:07, schrieb Jan-Peter Voigt: isn't the layer grob property what you want? no, it isn't ... but if one comes up with the right pdfmark ps command, there has to be a check of this layer property to avoid inconsistent lily- and pdf-layers. Best, Jan-Peter I could imagine declaring a specific lilypond layer as a pdf layer at the top of the file and later look for elements of this layer. That way I would be responsible myself and by default there wouldn't be any matching inconcistencies. Something like #(set-pdf-layer annotations 57) #(set-pdf-layer control-points 58) Urs ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user -- Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail gesendet. ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Create different pdf layers
Am 01.08.2013 15:01, schrieb Urs Liska: I could imagine declaring a specific lilypond layer as a pdf layer at the top of the file and later look for elements of this layer. That way I would be responsible myself and by default there wouldn't be any matching inconcistencies. Something like #(set-pdf-layer annotations 57) #(set-pdf-layer control-points 58) or you might have layer boundaries: #(set-pdf-layers '(-3 0 3 7) '(cellar normal upper control-points annotations) meaning that layers = -3 - cellar = 0 - normal = 3 - upper = 7 - control-points 7 - annotations but looking at this ... I think this not explanable ... its not a good idea ;) JP ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
