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Does the center of the staff need to be zero?

From: Kevin Dalley
Subject: Does the center of the staff need to be zero?
Date: Thu, 15 Mar 2007 18:38:22 -0700
User-agent: Gnus/5.110006 (No Gnus v0.6) XEmacs/21.4.19 (linux)

In LilyPond, using line-positions, the center is required to be at 0,
otherwise there are problems with the created score.  There are a
couple of possibilities.

One is to make the documentations more clear that staffs must be
centered at 0.

The other possibility is to modify LilyPond to take staffs which are
not centered at 0.

I notice 2 areas which need to be modified.  I have a small patch for, which otherwise draws the bar line of the correct size,
but centered around 0 rather than centered around the real center.

Ledger lines need some work as well, though there are problems even if
the staff is centered, particularly if the top and bottom lines are on
even positions.

Should I post my patch for bar lines for staffs which are not centered
at 0?

Here's a comment from the documentation about zero being the center.

The center (i.e. middle line or space) is position 0.

Here's a example of a bad bar position.

\version "2.10"
\new Staff \with {
  \override Staff.StaffSymbol #'line-positions = #'(1 3 5 7 9)
  \time 4/4
  c''1 | c'' \bar "" | c'' \bar "|."

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