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Re: Feature request: Display bezier control-points

From: David Nalesnik
Subject: Re: Feature request: Display bezier control-points
Date: Thu, 3 May 2012 21:12:03 -0500

Hi Urs,

>> But this really _is_ helping to find suitable values for the
>> control-points.
I'm very glad to hear this!

>>  * Although I know bezier curves from vector graphics software, I
>>    also was convinced that the 'control-points' were four points on
>>    the curve that define its shape.
Initially I did too...

>  * In fact the first and last are such points, whereas the middle two
>>    'control-points' are the 'handles'.
>>    -> Is this explained somewhere?
>>  * From seeing the crosses I now realize that (when using your
>>    function) all four offsets are relative to LilyPond's original
>>    decision.
>>    Well, if you think about it, that's quite obvious, but I always
>>    assumed that if I change one offset the other control-points would
>>    be affected accordingly.
>>    But in fact they aren't. So if I for example raise the endpoint of
>>    a slur, the third control-point may well get below the slur.
>>    This makes me understand the seemingly strange behaviour of the
>>    slurs when fiddling with the offsets.
>  * -> Probably it'll greatly improve my 'tweaking experience', even
>>    if I have seen this only once, not to speak if I manage to include
>>    this in a real-life workflow ...
>>    So, many thanks once more, David!
You're very welcome!  I've been playing around with it a bit myself, and
I'm becoming more and more convinced that something like this would be a
very useful feature.

You can also use it to show you the effect of changing other properties.
 For example, you can see the effects of overriding 'height-limit and
'eccentricity.  I'm finding it very instructive.

At least one thing, which I did do right now:
> I compiled one score with and without your cross setting, and comparing
> the two pdfs with Alt-Tab showed that the layout was perfectly identical -
> except for the additional crosses.
> So obviously the crosses are added after LilyPond decides about the layout.

I'm very glad to hear this!  My worry was that the crosses might push
staves further apart in extreme situations.

Thanks for trying this out!


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