Comment #6 on issue 1056 by shingarov: Pure-height of stems does not
accurately estimate height
http://code.google.com/p/lilypond/issues/detail?id=1056
Hi Neil,
The extent of a transparent grob is exactly the same as if it were
visible:
it still takes up space, so you'd expect both invisible.ly
(with Stem #'length = 0 disabled) to look the same as visible.ly.
I stepped through the execution of both Stem::pure_height() and
Stem::height() in the
debugger. It is not true that the vertical extent of a transparent stem is
the same
as the height of a visible stem. In the "visible.ly"/"invisible.ly"
examples, the
extent of the visible stem is (-4.18:-6.5), invisible is (-4.0:-4.18). The
pure
extent of invisible stem is (-4.0:-6.5) -- exactly the same as in the
visible case.
(So the estimation is off by 14 times).
So as a temporary solution, I would try just looking at the "transparent"
property
inside Stem::pure_height(), and return an empty Interval, or I guess better
a
zero-length Interval at whereever the translation happens to be.
Any suggestion on what the more permanent / more correct fix would be?
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