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Re: [PATCH] mensural rests vertical alignment

From: Juergen Reuter
Subject: Re: [PATCH] mensural rests vertical alignment
Date: Thu, 21 Mar 2002 11:34:12 +0100 (CET)

On Thu, 21 Mar 2002, Han-Wen Nienhuys wrote:

> ...
> I have  one big problem with this patch. It adds a lot of complexity
> to the rest-engraver, only for the sake of mensural rests. That is not
> acceptable. Practically speaking, I don't understand why this stuff
> has to be in the translator section. Why can't we have extra
> grob-formatting functions that deal with mensural rests? Formatting
> stuff should go into the back-end, not in the engravers.

Ok, but the vertical position depends on

(1) the range of pitches of preceeding and (not yet implemented)
    succeeding note heads.  This probably should be done by setting proper
    grob properties while processing the music (acknowledge_grob (),
    process_music ()), so this code must go into the engraver.

(2) the vertical position of the neighbouring rests (at least the nextmost
    rest to the left side) plus additional status information, that is
    needed while processing a sequence of rests, such as the current
    direction of the zig-zag line.  Hence, there really should be an
    instance (just like the rest engraver) that is capable of processing a
    sequence of rest grobs in a single function call.  Is this possible in
    the back-end?  Are there any examples of this kind?


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