Re: Getting width of markup in a music function

[David Kastrup]

Nathan Reed <address@hidden> writes:

> Hello,
>
> I'd like to be able to compute the width of a markup inside a music function,
> so that I can size another element based on the size of the markup.
>
> I've figured out how to compute the size inside a markup command:
>
> (ly:stencil-extent (interpret-markup layout props (markup ...)) X)
>
> This returns a pair of extents, and the difference of the cdr and car is the
> width.  This works great, but requires one to have the 'layout' and 'props'
> context, which one does not inside a music function.  Is there some way to
> combine the two approaches?  Or another way to get the width of a
> markup?

I find in the internals docs:


 -- Function: ly:text-interface::interpret-markup
     Convert a text markup into a stencil.  Takes three arguments,
     LAYOUT, PROPS, and MARKUP.

     LAYOUT is a `\layout' block; it may be obtained from a grob with
     `ly:grob-layout'.  PROPS is an alist chain, i.e. a list of
     alists.  This is typically obtained with `(ly:grob-alist-chain
     grob (ly:output-def-lookup layout 'text-font-defaults))'.  MARKUP
     is the markup text to be processed.

So that should work out if you have a grob already.  No idea where you'd
get one.

-- 
David Kastrup