Re: [Spam] Re: [Spam] Re: Spanner right-hand text may disappear when padded

[David Nalesnik]

On Mon, Oct 17, 2016 at 9:35 AM, David Nalesnik
<address@hidden> wrote:
> On Mon, Oct 17, 2016 at 8:26 AM, Rutger Hofman <address@hidden> wrote:
>> Thanks for all the help! First I post some rationale, then my real question,
>> which is targeted at the developers I guess.
>>
>> The behaviour I am after is a thing I really do want: it is visually
>> confusing if the 'a tempo' comes halfway the 'poco rit.)' when it is clearly
>> meant to be after it.
>>
>> I am afraid that solutions involving staff-padding are not general enough;
>> if I try to move the \markup{a tempo} in my example to the beginning of its
>> bar, there is no value for right.text padding or staff-padding that lets it
>> be both visible and at the same vertical position. And even then I am unsure
>> if it will work for all 14 instrument parts (the tempo indications are
>> needed in all), the skyline can be wildly different.
>
> I'm having difficulty understanding exactly what it is that you want
> or why the solutions presented are insufficient.  Is it possible to
> provide some sort of mockup--if if hand-drawn--to show exactly how
> you'd like this to look?
>
>> OK... Now for the real question.
>>
>> I am really unenlightened why the right.text (or for that matter, both
>> left.text and right.text if the padding is chosen sufficiently large)
>> disappears for largish values of padding. After all, the padding is intended
>> to stretch outside the texts, isn't that correct?
>>
>> For a quick attempt to see if things crash or whatever if this test is
>> disabled, I cloned git and built on my Ubuntu, verified quickly that the
>> unmodified install works, then commented out that test (line 329 in
>> lily/line-spanner.cc) and ran again. Lo and behold, everything looks OK in
>> my first quick tests.
>>
>> I am not familiar with Lilypond internals, so this raises my question: what
>> is this test for? What problems does it guard against? Should it only hold
>> for other spanners than text spanners? Or for right-broken text spanners?
>> Etc. Or is it just a bug/feature silently living on from the past?
>
> When I fiddled around this a few days ago, the dashed line would
> disappear when doing this.  Modifying the code to show the dashed line
> again (another condition) shows the line superimposed on the right
> text.
>
> I can't investigate this further/pass along my test code for you to
> investigate, b/c unfortunately I'm having a file permissions disaster
> on my Win10 system.
>

Sorry about the empty email!

I've attached a Scheme rewrite of ly:text-spanner::print which allows
for easy demonstration of the problems I mention above.

I've removed the padding check.  This only brings back the right text.
The line is suppressed b/c the endpoint of the right side is actually
LEFT of the endpoint of the left side

Removing the check (line 161) draws the line, and you can see the consequences.

You could experiment with finding a way to set the X of the broken
second-half of the spanner to some value under 0.  I don't have a
rewrite of that C++ stuff, so it will mean messing with the source.

Sorry I can't be of more help.

David

demo.ly
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