Re: SVG output - Group multiple grobs together

2018-01-11 Thread James Opstad 
Thanks. I will work through the example. It seems it isn't possible to embed 
more than one item within a group and one group per grob is the only approach 
for the time being. If this is the case then why use groups rather than adding 
the attributes to the grob itself?


James




From: David Nalesnik <david.nales...@gmail.com>
Sent: 10 January 2018 15:21
To: James Opstad
Cc: lilypond-user@gnu.org
Subject: Re: SVG output - Group multiple grobs together

Hi James,

On Wed, Jan 10, 2018 at 5:51 AM, James Opstad <jamesops...@hotmail.com> wrote:
> Hello,
>
>
> I have been experimenting with the new output-attributes grob property for
> SVG output. For example, the following code creates a group with id="noteC"
> around the C notehead.
>
>
> \version "2.19.80"
> \pointAndClickOff
> \relative c' {
>   \once \override NoteHead.output-attributes = #'((id . noteC))
>   c4 d e f |
> }
>
> How would I include multiple grobs within the same group e.g. all the grobs
> associated with a single note (NoteHead, Stem, Accidental etc.)?
>

All grobs have pointers to other single grobs or arrays of other
grobs.  You gain access to these through such functions as
ly:grob-parent, ly:grob-object, ly:grob-array, ly:item-get-column.
The idea of "multiple grobs within the same group e.g. all the grobs
associated with a single note" can prove to be complex since your idea
of a grouping is not necesarily LilyPond's.  You may have to follow
chains of pointers--as I did below to arrive at the Stem grob from
NoteHead: i.e, through NoteColumn, the Y-parent of the NoteHead.

So here is something quickly hacked together from your code example:

\version "2.19.65"

\pointAndClickOff
\relative c' {
  \once \override NoteHead.output-attributes =
  #(lambda (grob)
 (let* ((acc (ly:grob-object grob 'accidental-grob))
(acc-name (if (ly:grob? acc) (grob::name acc) "none"))
; we need a NoteColumn object for access to other grobs
(nc (ly:grob-parent grob Y))
(stem (ly:grob-object nc 'stem))
(stem-name (if (ly:grob? stem) (grob::name stem) "none"))
(pc (ly:item-get-column grob))
(pc-name (if (ly:grob? pc) (grob::name pc) "none"))
(elts (ly:grob-object pc 'elements)))
   (display elts) ; just so you see a grob array
   (list
(cons 'id 'noteC)
(cons 'accidental acc-name)
(cons 'stem stem-name)
(cons 'column pc-name

  c4 d e f |
}

%%%

Here is a link to something you might find useful.  It stores data
about every grob encountered.

https://www.mail-archive.com/lilypond-user@gnu.org/msg117645.html

HTH,

David
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Re: SVG output - Group multiple grobs together

2018-01-11 Thread Paul Morris 

Hi James,  I'm cc'ing the user list, as per the usual custom.


On 01/11/2018 08:13 AM, James Opstad wrote:


Thanks. I will work through David's example. It seems it isn't 
possible to embed more than one item within a group and one group per 
grob is the only approach for the time being. If this is the case then 
why use groups rather than adding the attributes to the grob itself?




Good question.  I think it's because some grobs produce more than one 
glyph, path, or shape in the SVG, so the groups group these together as 
one thing.  Might be interesting to explore feasibility of conditionally 
adding groups only when needed (for grobs with multiple shapes) and 
otherwise adding properties to the (single) SVG shapes themselves.


Cheers,
Paul
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Re: SVG output - Group multiple grobs together

2018-01-10 Thread Paul Morris 

On 01/10/2018 06:51 AM, James Opstad wrote:
How would I include multiple grobs within the same group e.g. all the 
grobs associated with a single note (NoteHead, Stem, Accidental etc.)?


Hi, I don't think there is currently a way to do that.  You could give 
each grob you want to group together the same id.  Your SVG will not be 
as concise or elegant (one group per grob), but it might be a way to get 
the job done.


-Paul
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Re: SVG output - Group multiple grobs together

2018-01-10 Thread David Nalesnik 
Hi James,

On Wed, Jan 10, 2018 at 5:51 AM, James Opstad  wrote:
> Hello,
>
>
> I have been experimenting with the new output-attributes grob property for
> SVG output. For example, the following code creates a group with id="noteC"
> around the C notehead.
>
>
> \version "2.19.80"
> \pointAndClickOff
> \relative c' {
>   \once \override NoteHead.output-attributes = #'((id . noteC))
>   c4 d e f |
> }
>
> How would I include multiple grobs within the same group e.g. all the grobs
> associated with a single note (NoteHead, Stem, Accidental etc.)?
>

All grobs have pointers to other single grobs or arrays of other
grobs.  You gain access to these through such functions as
ly:grob-parent, ly:grob-object, ly:grob-array, ly:item-get-column.
The idea of "multiple grobs within the same group e.g. all the grobs
associated with a single note" can prove to be complex since your idea
of a grouping is not necesarily LilyPond's.  You may have to follow
chains of pointers--as I did below to arrive at the Stem grob from
NoteHead: i.e, through NoteColumn, the Y-parent of the NoteHead.

So here is something quickly hacked together from your code example:

\version "2.19.65"

\pointAndClickOff
\relative c' {
  \once \override NoteHead.output-attributes =
  #(lambda (grob)
 (let* ((acc (ly:grob-object grob 'accidental-grob))
(acc-name (if (ly:grob? acc) (grob::name acc) "none"))
; we need a NoteColumn object for access to other grobs
(nc (ly:grob-parent grob Y))
(stem (ly:grob-object nc 'stem))
(stem-name (if (ly:grob? stem) (grob::name stem) "none"))
(pc (ly:item-get-column grob))
(pc-name (if (ly:grob? pc) (grob::name pc) "none"))
(elts (ly:grob-object pc 'elements)))
   (display elts) ; just so you see a grob array
   (list
(cons 'id 'noteC)
(cons 'accidental acc-name)
(cons 'stem stem-name)
(cons 'column pc-name

  c4 d e f |
}

%%%

Here is a link to something you might find useful.  It stores data
about every grob encountered.

https://www.mail-archive.com/lilypond-user@gnu.org/msg117645.html

HTH,

David

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SVG output - Group multiple grobs together

2018-01-10 Thread James Opstad 
Hello,


I have been experimenting with the new output-attributes grob property for SVG 
output. For example, the following code creates a group with id="noteC" around 
the C notehead.


\version "2.19.80"
\pointAndClickOff
\relative c' {
  \once \override NoteHead.output-attributes = #'((id . noteC))
  c4 d e f |
}

How would I include multiple grobs within the same group e.g. all the grobs 
associated with a single note (NoteHead, Stem, Accidental etc.)?


Thanks,

James
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