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Re: Changing conducting signs

From: Carl Sorensen
Subject: Re: Changing conducting signs
Date: Wed, 16 Jun 2010 06:47:23 -0600

Copying to -devel to get developer feedback, and to bug to get the issue in
the tracker if it belongs there.

On 6/16/10 1:58 AM, "flup2" <address@hidden> wrote:
> I would like to know if somebody knows how conductng signs (
> ) are created by Lilypond.
> In a lot of books (Kurt Stone for instance) I noticed that beats divided by
> 3 are noted by a full triangle, no a "two-parts" triangle like Lilypond
> does.

Is this a bug in LilyPond?  Does anybody ever want the incomplete triangle?
The thing that is printed is *called* a triangle.  It would be trivial for
me to make it be a closed triangle.

I'm not familiar enough with measure grouping signs to say what is "right",
but this looks to me to be an error, not just an alternative choice.  I'll
await comment by those who know more before I push a patch.

> So, perhaps is there a way to tweak these shapes, but I don't know how (and
> even where to look for).

Unfortunately, there is no simple scheme interface for tweaking these
shapes.  These shapes are all created in C++ code.

If you want to try tweaking these shapes, you'll need to write a scheme
routine that can be used as a 'stencil for the MeasureGrouping grob:

\override MeasureGrouping #'stencil = #my-new-stencil

Long-term, it would probably be better to move this stencil creation code to
Scheme, so that it could be overriden more easily.



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