While waiting for a knowledgeable reply on this list, which never
came, I managed to find a solution.
The helpful volunteers who answer questions on this mailing list are
happy that you managed to find a solution.
It took a fair amount of experimenting to get it right, principally
given the utterly sparse documentation about \filled-box and
\with-color notably regarding the form and semantics of their
arguments.
The helpful volunteer who manages the documentation (i.e. me) will be
happy to receive patches and detailed descriptions of what to add to
the docs. I know a lot less about \filled-box and \with-color than
you do.
(Hmm, in hindsight I can see how I may have sounded inappreciative,
sorry, I guess I was just steaming off for seeing every other post
getting a reply and mine a "deafening silence" as they say.)
All that the manual (version 2.6.6) says about \filled-box is:
\filled-box xext (pair of numbers) yext (pair of numbers) blot (number)
Draw a box with rounded corners of dimensions xext and yext.
I suggest completing this as follows.
\filled-box xext (pair of numbers) yext (pair of numbers) blot (number)
Draw a box with possibly rounded corners of dimensions xext and yext,
where the first number of xext is
the horizontal offset of the left side of the box,
the second number of xext is
the horizontal offset of the right side,
the first number of yext is
the vertical offset of the bottom side,
and the second number of yext is
the vertical offset of the top side.
All offsets are in staff spaces
and relative to the current position.
Positive offsets are rightwards and upwards,
negative offsets are leftwards and downwards.
The blot is the roundness of the box corners,
namely the diameter in staff spaces of the circle
corresponding to the curve made by each corner,
and should not exceed half the size of the
width or height of the box, which one is smaller.
Naturally a value of zero represents sharp corners.
Example:
\filled-box #'(-.3 . 1.8) #'(-.3 . 1.8) #0
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