Re: Issue 1061 in lilypond: Pure-height inaccuracy very large when skyline significantly non-rectangular

[lilypond]

Comment #1 on issue 1061 by joeneeman: Pure-height inaccuracy very large  
when skyline significantly non-rectangular
http://code.google.com/p/lilypond/issues/detail?id=1061

I only get the attached output when the patch for Issue 1053 is applied. I  
think this
points to a problem in System::part_of_line_pure_height, which is only  
including the
staves and not the various other objects which live in System (like bar  
numbers).

The fix, I think, would be to factor out axis-group-interface.cc:231-265  
into a
separate function and to modify it so that it uses begin_of_line_extent or
end_of_line_extent whenever it encounters a VerticalAxisGroup. Then replace  
calls to
System::part_of_line_pure_height with calls to this new function.

Regarding lyric descenders, this is not really a problem with pure height  
estimation;
rather, it is a problem in approximating systems with bounding boxes during  
page
breaking (that is, the estimates for the bounding boxes are actually ok but  
the
bounding boxes are poor approximations to the skylines).

By the way, the space at the bottom will be much less ugly if you turn off  
ragged-bottom.

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