Re: fermata and text (markup) on/above one note

[Mats Bengtsson]

Valentin Villenave wrote:
> 2008/2/15, Mats Bengtsson <address@hidden>:
>
>   
> > To understand why, you have to understand what the default setting
> >  of DynamicLineSpanner #'Y-extent does, namely to calculate the actual
> >  extent of the included dynamics indications. Then, once this has done,
> >  the placement of the full DynamicLineSpanner is determined using the
> >  padding and staff-padding properties, that specify the distance from
> >  the upper edge of the full DynamicLineSpanner to the closest note and/or
> >  staff. When you instead specify a fixed value of Y-extent, LilyPond
> >  won't care about the actual extent of the dynamics and align it as if
> >  the top was at, say, 1 (if you set #'Y-extent = #'(-1 . 1)) relative to
> >  the internal reference point of the DynamicLineSpanner. To complete the
> >  picture, every element included in the DynamicLineSpanner, such as a
> >  Hairpin or DynamicText makes its own alignment relative to the
> >  reference point of the DynamicLineSpanner.
> >     
>
> Quite interesting... But doesn't that make some collisions more likely
> to happen?
>   
Of course! You are fooling LilyPond into believing that the objects have a
different size than the their true size, so the collision avoidance 
mechanism
gets the wrong information. As long as you're sure to over-estimate the true
size of the objects, then you should be on the safe side.
This is the reason that I specified minimum-Y-extent instead of Y-extent 
for the
TextScript objects in a previous example. However, for some reason I didn't
manage to get good results when I replaced Y-extent by minimum-Y-extent
for the DynamicLineSpanner object, so I don't fully understand the 
mechanism.
> Anyway, here's a snippet to demonstrate your point (tell me if my
> explanations aren't correct).
> http://lsr.dsi.unimi.it/LSR/Item?id=387
>
>   
Since the forte symbols are slightly cut at the bottom of the snippet, the
lower extent setting of -1 should probably be changed to something like 
-1.5.

You don't mention the TextScript objects in the explanation. For example,
you could just add "The same idea is used to align the text scripts along
their baseline."

  /Mats