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Re: Bar lines

From: Mats Bengtsson
Subject: Re: Bar lines
Date: Mon, 19 May 2003 17:05:23 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20021003

Han-Wen Nienhuys wrote:
address@hidden writes:

Because of a question in user-lilypond, I looked at the function
scm/output-lib.scm: default-break-barline
and noticed a few problems:

This function handles a number of bar types that are not handled
by Bar_line::compound_barline(...), which is a problem since
default-break-barline is only called at line breaks.

"||:" is treated twice, whereas ":||" is missing, probably an
old copy-paste bug.

I propose to make the following change:

- Always call the function, not only at line breaks

Huh? What do you mean exactly (and what problem would it solve?)

Sorry! The alternative would be to add the "||:", ":||", "|s" and
more combinations that you could think of also in
Bar_line::compund_barline(). My idea was to keep the basic ones
in the C++ code and add the rest that only differ in how they are
treated at line breaks in the default-break-barline function.

- Let the function return three values "glyph in the middle
  of the line", "glyph at line end" and "glyph at line start".

Do you mean a string (like now) or a molecule?

Haven't thought about it. The default-break-barline function
should still be fairly easy to redefine in a users file, so I
wouldn't want it to build the molecules from scratch for every
special case. The idea would rather be to express what should
happen at a line break (and in the middle of a line) expressed
in terms of the basic bar line types that currently are handled
in C++.

Yes, if bar-line gets a changeover, why not do dotted barlines too at
the same time, in the C++ code.

Of course. We already have PS code to draw the dashed lines, don't we?
However, I'm not sure if we want a separate property dashed or if that
aspect should be included in the string argument to \bar describing the
bar type.


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