b...@shingarov.com wrote:
Hi all,
I am playing with the vertical spacing algorithms, and am very
surprised by the behavior of "page-height".
Let's say for example that I set my paper to A6. This, by ISO216, is
148mm high.
when calc-printable-height applies (ly:output-def-lookup layout
'paper-height), it ends up in Output_def::lookup_variable() and
ultimately in ly_module_lookup(). This does not return 148, but
84.22!!! [...]
Hi.
Are you aware of the units? I'm not at all, and neither did have a look
in the code, but 84.22 is suspiciously near to 148 / (7/4), where the
parenthesized term is 7 mm per 4 staff units, which is (not considering
rounding errors) the default global staff size.
More accurate: I think LilyPond uses a pt size of 1/72.27 in, so a staff
(with four staff units) has height 20*25.4/72.27 mm = 7.0292 mm, and 148
/ (7.0292 / 4) = 84.22 to a precision of three digits.
So I'm quite sure that the output of output-def-lookup is in global
staff size units, not in mm, and a conversion happening somewhere hidden
in the code, and not specifically for page-height.
HTH,
Alexander
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