Re: Whole-note tremolo beams

[Thomas Morley]

Am So., 22. März 2020 um 17:38 Uhr schrieb Leo Correia de Verdier
<address@hidden>:
>
> Second attempt:
[...]

Hi,

please find attached my own take on it.

The tremolo-beam now avoids left-note-column's dots and
right-note-column accidentals automagically and is
centered around the thought line between the vertical center of the
note-heads staff-positions of left and right note-column.
Furthermore, I introduced some subproperties of Beam.details:
(1)
Beam.details.tremolo-positions, expecting a pair, defaulting to '(0 . 0)
for fine-tuning
NB Introducing details.tremolo-positions is part of the workaround. A
user set 'positions would disturb the stencil-examination. If you use
Beam.positions, you will need to figure out all the needed values.
Then the function assumes you want to Y-position the Beam yourself and
restricts it's behaviour to left/right gaps.
(2)
Beam.details.whole-note-tremolo-gaps, expecting a pair, defaulting to
'(0.5 . 0.5)
for fine-tuning the gaps

Note:
because of
https://sourceforge.net/p/testlilyissues/issues/5868/
an additional function 'correct-whole-note-tremolo-gap' is added.

In general, the function examines the default-stencil and returns a
modified one.
The first ~90 lines are debugging helpers. They may be activated
setting the boolean in line 369 to #f
Ofcourse it would be better the default would do the right thing right
from the begining...

Thus, it's a workaround, nothing more, but demonstrating how tremolo
for whole notes should come out per default imho.


Cheers,
  Harm

tremolo-gap.png
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tremolo-gap.ly
Description: Text Data