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Re: Issue 1056 in lilypond: Pure-height of stems does not accurately est


From: lilypond
Subject: Re: Issue 1056 in lilypond: Pure-height of stems does not accurately estimate height
Date: Thu, 15 Apr 2010 21:32:28 +0000


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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