On Apr 21, 2014, at 1:17 AM, David Hinkle <[email protected]> wrote:
> I'm working on a new GPL web application designed to help new people learn to
> sing using the new FFT capabilities of HTML5. (Git hub links below if you're
> interested).
>
> I'd like to use Lilypond to generate scores for display in the app. In order
> to show the user the feedback about where they're singing I'd like to
> superimpose that feedback on the score, but I need to know the X/Y positions
> of the bars and staves.
>
> I'm willing to go so far as to modify Lilypond to export this information
> when it generates an PNG but I'd like to ask the list first if they have any
> other ideas, and if not, maybe they could point me to the best place to start
> tinkering with Lilypond source to get the information exported.
>
> My Proof of concept:
> https://github.com/drachs/singingPractice
>
> A live example of precisely identifying the frequency of a tone and
> displaying it on a staff. Blue line is the precise frequency based on a
> curve fit of the FFT, red bars are fft output. White lines are bass and
> treble clef staff lines. (Staff lines are spread further out as the
> frequency gets higher
>
> https://rawgit.com/drachs/singingPractice/2d53330f77122a435063b57dd5322418851510a4/notedisplay.html
LilyPond may not be the best tool to do what you want.
For short examples, check out the GUIDO server.
http://guidoeditor.grame.fr
It sends scores to a server in realtime and recuperates either a canvas or a
png (http://guidoeditor.grame.fr/png.html). The public API has methods that
generate what are called
Time2GraphicMap, which give you this type of XY information.
GUIDO is available at http://sourceforge.net/p/guidolib/code/ci/master/tree/.
For LilyPond, I’d recommend using the SVG to get data about where things are
placed globally.
Cheers,
MS
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