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Re: Distance of a grob from its reference point

From: Paolo Prete
Subject: Re: Distance of a grob from its reference point
Date: Thu, 16 Jan 2020 23:09:32 +0100

Hi Robin,

On Thu, Jan 16, 2020 at 10:05 PM Robin Bannister <address@hidden> wrote:
Paolo Prete wrote:

> And I really thank you. Offsetting brackets is a *very*, *very* important
> feature in professional music engraving.

You're welcome.

I'm sorry to say that I made additional tests and the +0.46 method doesn't seem to work.
You can check here:


\version "2.19.45"

\override Staff.OttavaBracket.outside-staff-padding = #0
  \ottava #1 f''' f''' f''' \ottava #0 f''
\override Staff.OttavaBracket.outside-staff-padding = #0.56
  \ottava #1 f''' f''' f''' \ottava #0 f''

\override Staff.OttavaBracket.extra-offset = #'(0 . 0.1)
  \ottava #1 f''' f''' f''' \ottava #0 f''



0.56 s exactly the quantity corresponding to extra-offset to 0.1.   But if you produce a SVG file, and open it with a text editor, you will see three pairs of coordinates:

(first bracket)
<text transform="translate(35.1781, 4.6976)" .... 

(second bracket)
<text transform="translate(35.1781, 4.6976)" .... 

(third bracket)
<text transform="translate(48.2297, 4.5976)"...

As you can see, only the third bracket (corresponding to the extra-offset property) is correctly shifted by 0.1

I also checked that the same issue happens with DynamicLineSpanner. There's a value aroud 0.46, but not exactly 0.46 as the default offset.  And it seems to be the same for both OttavaBracket and DynamicLineSpanner....
Where did you pick the 0.46 value? I did grep on the whole tree src, and even if it's set as  default_outside_staff_padding_  ( it must have overridden by something else...



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