2014-08-07 14:16 GMT+02:00 David Kastrup <d...@gnu.org>:
> Richard Shann <rich...@rshann.plus.com> writes:
>
>> the docs (
>> http://www.lilypond.org/doc/v2.18/Documentation/internals/self_002dalignment_002dinterface
>>  ) say:
>> "
>>  self-alignment-X (number)
>>
>>     Specify alignment of an object. The value -1 means left aligned, 0 
>> centered, and 1 right-aligned in X direction. Other numerical values may 
>> also be specified.
>> "
>>
>> which doesn't give much clue as to what the units are... (if I'm looking
>> at the right thing)
>
> The units are pretty well-defined.  -1 means left-aligned, 1 means right
> aligned.  So moving the entire width of the object from left edge to
> right edge implies a difference of 2.
>
> So the unit is half the object width.

However (in case you wondered) the unit of self-alignment-X in case of
LyricTexts is half the difference between object's and notehead's
witdths.

best,
Janek

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