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Re: BendSpanner-engraver

From: Marc Hohl
Subject: Re: BendSpanner-engraver
Date: Wed, 14 Sep 2016 14:43:53 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

Hi Harm,

Am 13.09.2016 um 22:41 schrieb Thomas Morley:
Even if I wouldn't want to take one I'm forced to: my regular job
started after summer-break :((

For me, too :( And -as ever– the TODO list for doing stuff within the summer break is still not completely done.
The customization features are great! Also, I like the dashed line of the
pre-pend-hold use cases.

Looks doable, I'll probably try the upcoming weekend.#



Well, we can't expect a user to find his way to this coding, maybe
some predefined function, will do it!?

I hope to find the source somewhere to provide you a scan of how it should
look like.

Would be great.

Still searching ...


Another idea/thought/proposal: IIUC, the engraver does not take the string
numbers into account. I think this would be a good feature from a user's
point of view:

c'\startBend d'\stopBend\startBend c'\stopBend

could then probably be simplified to

c'\3\startBend d'\3 c'\3\stopBend

You may have noticed the file being remarkable short.
Coding shortcuts and appending them to the bend-music-functions-file
is on the TODO

Something at the lines of:
This is a very first shot, more a proof-of-concept...

This is possible, but I don't think that shortcuts are sufficient here.

Some years ago I had long discussions on the devel list concerning the implementation of a string-bend-engraver (that would have had to be done in C++ at this time), especially with Carl Sorensen, and we came to the conclusion that a bend event is something that happens *to a certain string*, therefore it is possible to bend a string, keep it bent, bend another one, release it and then release the first bent string again.

This is rather complicated stuff, but some guitarists do stuff of this kind ;-)

I considered it already.
Though, the engraver mimics the behaviour of TextSpanner.
And you can't start a TextSpanner inside EventChord.

I didn't figure how to do it different.

We discussed about that as well ;-) I tried to follow the slur engraver, but this is one of the more complicated engravers, so I finally gave up ;-)

Technically speaking, the mimics of the slur engraver seem ideal if you see it as a per-string basis: you cannot have two simultaneous bends on one string, but you can bend each string independently.

I have a suspicion about the slow down...
Will test as soon as I have some spare time, though it's a highly
complex and huge coding.
Sometimes I feel like touching the limits of my current coding skills.
Proceeding means to do all very carefully and thoroughly and _not_ in
any hurry ;)

Of course! As already said, I was working on the concept of a string-bend-engraver for about 1 1/2 years or so, and the ideas and concepts are still (mostly) available. I'd be glad to help you with this task, but some private messages in German language could be perhaps more effective here ... ;-)


Although, guitar-player myself I never use TabStaff

My pupils are fond of tablatures, easy available, easy to understand ...
And trying to write down a contemporary guitar solo with normal staves only is a bit of a nightmare ;-)



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