Re: Using \lookup to extract glyphs

[Mats Bengtsson]

Mats Bengtsson wrote:
> It would be nice if the argument was the desired height measured in 
> points (or perhaps in staff spaces)
> instead of the current numerical argument where you need a lot of 
> trial and error.
> If it was in points, then you could easily relate it to the height of 
> one staff, which is 20pt by default.
>
> Unfortunately, it seems that the mapping from brace number to height 
> is non-linear (possibly
> piecewise linear). I don't have the time right now to figure out the 
> exact relationship.
Now that I've looked a bit more careful, I see that the total height of 
braceN is given by
10.5*(1+1/150)^N
so in other words, if the desired height is H, you can get the number of 
the corresponding
brace glyph by
(round (/ (log (/ H 10.5)) (log (+ 1 (/ 1 150)))))

   /Mats