[smufl-discuss] Re: Augmentation dot

[David Webber]

From: Maurizio M. Gavioli

> The standard includes two augmentation dot glyphs (if there are more I
> missed
them): U+E216 and U+E22C.
> The first is vertically centred in the space below the base line (on -125
y), the second is centred slightly above the base line (on +30 y): which
one, if any, is intended to be used are 'standard' augmentation dot in a
score?

Augmentation dots are drawn in different vertical positions according to
context:

- in the space to the right of a lone note in a space
- to the right of the note and raised above the note (so that it falls in a
space)  for a lone note on a line.
- and in closely spaced chords sometimes dropped into the space below the
line for a note on a line (for example when the lower of two notes a 2nd
apart is on a line).

All of these are perfectly 'standard'.    (I'd have assumed that software
would draw a single symbol in the appropriate position, rather than having
separate symbols for different placements - or have I missed something?)

Dave

David Webber
Mozart Music Software
http://www.mozart.co.uk/ 


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[Maurizio M. Gavioli]

David Webber wrote

From: Maurizio M. Gavioli

> The standard includes two augmentation dot glyphs (if there are more I
> missed
them): U+E216 and U+E22C.
> The first is vertically centred in the space below the base line (on -125
y), the second is centred slightly above the base line (on +30 y): which
one, if any, is intended to be used are 'standard' augmentation dot in a
score?

Augmentation dots are drawn in different vertical positions according to
context:

- in the space to the right of a lone note in a space
- to the right of the note and raised above the note (so that it falls in a
space)  for a lone note on a line.
- and in closely spaced chords sometimes dropped into the space below the
line for a note on a line (for example when the lower of two notes a 2nd
apart is on a line).

Thanks for the summary. This is rather well known, though.

(I'd have assumed that software would draw a single symbol in the appropriate position, rather than having separate symbols for different placements - or have I missed something?)

I assumed the same; however, the software has to know how the symbol is registered to properly place it in the due position (and one of the purposes of the SMuFL standard is also, and usefully, to provide a common glyph registration, so the the software does not have to cope with the registration vagaries of different fonts).

The registration of either glyph labelled "Augmentation dot" seems in contradiction with the registration guide lines in the standard introductory matters.

Or am *I* missing something?

Thanks,

Maurizio M: Gavioli

P.S.: of course, the app may choose to totally disregard the glyph and use a drawing primitive for the circle; however, given the glyph(s?) are there, I would like to understand the rationale behind their registration.

[Maurizio M. Gavioli]

Re-reading my own posts, it occurred to me that perhaps I have been too terse. I'll try to re-formulate my questions:

Fact 1): ver. 0.6 of the SMuFL contains two glyphs named "Augmentation dot": U+E216 and U+E22C.

Question 1); Why two glyphs?

Fact 2): Current Bravura version implements them as:

*) U+E216: a circle of 143 FU of diameter, horiz. aligned at x = 0 and vert. centred on y = -125 (i.e. in the 'staff space' below the base line)
*) U+E22C: a circle of 125 FU of diameter, horiz. aligned at x = 140, vert. centred on y = 30; it also 'overhangs' a very narrow glyph advance of 57 FU only.

Question 2): neither glyph seems to follow the registration guide lines outlined in the standard introductory pages, which say (p. 15): "Glyphs for movable notations that apply to some vertical staff position (e.g. note heads, accidentals) shall be registered such that the font baseline lies exactly at that position. For example, a typical notehead or accidental glyph is registered such that it is vertically centered on the baseline". Which is the rationale behind the registration choices for those two glyphs?

(Note: Bravura is 'just one implementation' of SMuFL; as of today, however, it is the only one and it is made by the same organisation putting together the standard itself, so it approaches significantly the concept of "reference implementation".)

Hoping this makes my questions clearer, thanks,

Maurizio M. Gavioli