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Re: wrong down-bow symbol position

From: Werner LEMBERG
Subject: Re: wrong down-bow symbol position
Date: Sat, 13 Mar 2004 07:40:32 +0100 (CET)

> > The down-bow symbol is positioned too near to the note head.  The
> > problem might be related to the smaller staff size...
> all symbols share the same settings, and I've just tuned down the
> padding to accomodate your staccato-position bugreport.  Evidently,
> a more comprehensive solution is needed.  Can you investigate?

Two possible solutions come to my mind:

  . In the mf sources, increase the vertical bounding box of the
    affected symbols.  I fear that this won't work in general.

  . Implement vertical kerning.  This would also help for stacking
    symbols.  Here I see three possibilities:

      . Abuse the facilities in TFM files for horizontal kerning.

      . Create a Scheme solution.  A disadvantage is that a change in
        the mf sources isn't automatically reflected in the Scheme

      . Add vertical kerning to the mf sources which are then handled
        by the mf-to-table script.  If you go this route (which I
        recommend) you should consider vertical sector kerning; this
        avoids setting up glyph-by-glyph tables.

        This kerning data could be used even for objects like staff
        lines which aren't MF-objects at all.

        Note that I'm not sure that sector kerning is sufficient;
        maybe there are situations that two grobs have to be stacked
        specially.  Currently, I can't think of such a situation, but
        who knows...


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