> So, I foresee this fictional application as follows. A text editor
> (fulfilled with some Lilypond-command help in the way lilypondtool
> does) which at some moment, by pressing a certain key, shows a
> sketch, an image of the score at the point I'm writing. This image
> doesn't need to be as perfect as the final output. I don't know how
> much of the processing time of Lilypond could be saved by this, but
> I think this is always preferable to the compile-pdf
> viewer-etc. sequence. All the same, the final polish will have to
> be made compilling the PDF.
A similar problem exists with TeX. IIRC, people have developed a
slightly modified DVI format to have a kind of `state snapshots' every
page (or paragraph, I no longer remember). A daemon then simply
allows display of everything typeset so far, while the user inputs new
data. Here's a paper:
www.pytex.org/doc/euro2002.pdf
Werner
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